Class: Grainery::Grainer

Inherits:
Object
  • Object
show all
Defined in:
lib/grainery/grainer.rb

Constant Summary collapse

ALLOWED_BASE_CLASS_PATTERN =

Security: Whitelist of allowed base class patterns

/\A(ApplicationRecord|ActiveRecord::Base|[A-Z][a-zA-Z0-9]*Record|[A-Z][a-zA-Z0-9]*(DB|Database|Connection))\z/

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Grainer

Returns a new instance of Grainer.



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# File 'lib/grainery/grainer.rb', line 11

def initialize
  @config = load_config
  @grainery_path = load_grainery_path
  @database_configs = load_database_connections
  @lookup_tables = load_lookup_tables
  @anonymize_fields = load_anonymize_fields
end

Instance Attribute Details

#database_configs ⇒ Object (readonly)

Returns the value of attribute database_configs.



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# File 'lib/grainery/grainer.rb', line 6

def database_configs
  @database_configs
end

#lookup_tables ⇒ Object (readonly)

Returns the value of attribute lookup_tables.



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# File 'lib/grainery/grainer.rb', line 6

def lookup_tables
  @lookup_tables
end

Instance Method Details

#anonymize_value(field_name, faker_method, column, original_value = nil) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 668

def anonymize_value(field_name, faker_method, column, original_value = nil)
  return nil if faker_method.nil?

  begin
    # Generate fake value based on method
    fake_value = case faker_method.to_s
    when 'email'
      Faker::Internet.email
    when 'first_name'
      Faker::Name.first_name
    when 'last_name'
      Faker::Name.last_name
    when 'name'
      Faker::Name.name
    when 'phone_number'
      Faker::PhoneNumber.phone_number
    when 'address'
      Faker::Address.full_address
    when 'street_address'
      Faker::Address.street_address
    when 'city'
      Faker::Address.city
    when 'state'
      Faker::Address.state
    when 'zip_code'
      Faker::Address.zip_code
    when 'ssn'
      Faker::IDNumber.valid
    when 'credit_card_number'
      Faker::Finance.credit_card
    when 'password'
      Faker::Internet.password
    when 'token'
      generate_token(column)
    when 'api_key'
      generate_api_key(column)
    when 'secret'
      generate_secret(column)
    when 'iban'
      generate_fake_iban(column)
    when 'greek_vat'
      generate_fake_greek_vat(column)
    when 'greek_amka'
      generate_fake_greek_amka(column)
    when 'greek_personal_number'
      generate_fake_greek_personal_number(column)
    when 'greek_ada'
      generate_fake_greek_ada(column)
    when 'greek_adam'
      generate_fake_greek_adam(column)
    when 'date_of_birth'
      generate_fake_date_of_birth(original_value, column)
    when 'identity_number'
      generate_fake_identity_number(column)
    else
      # Try to call the method dynamically if it exists
      if Faker.respond_to?(faker_method)
        Faker.send(faker_method)
      else
        nil
      end
    end

    # Truncate to column limit if necessary
    if fake_value.is_a?(String) && column.limit
      fake_value = fake_value[0...column.limit]
    end

    fake_value
  rescue => e
    # If faker fails, return nil or a safe default
    puts "  ⚠ Warning: Could not anonymize #{field_name} with #{faker_method}: #{e.message}"
    nil
  end
end

#build_dependency_graph(models) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 525

def build_dependency_graph(models)
  graph = {}

  models.each do |model|
    graph[model] = []

    # Find belongs_to associations (dependencies)
    model.reflect_on_all_associations(:belongs_to).each do |assoc|
      begin
        if assoc.klass && !assoc.polymorphic? && models.include?(assoc.klass)
          graph[model] << assoc.klass
        end
      rescue
        next
      end
    end
  end

  graph
end

#create_default_config ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 33

def create_default_config
  config_path = Rails.root.join('config/grainery.yml')

  # Detect databases and model base classes dynamically
  detected_databases = detect_databases_and_models

  # Detect anonymizable fields from actual database schema
  detected_fields = detect_anonymizable_fields(detected_databases)

  # Build default anonymize_fields hash
  default_anonymize_fields = {
      'email' => 'email',
      'first_name' => 'first_name',
      'last_name' => 'last_name',
      'name' => 'name',
      'phone' => 'phone_number',
      'phone_number' => 'phone_number',
      'address' => 'address',
      'street_address' => 'street_address',
      'city' => 'city',
      'state' => 'state',
      'zip' => 'zip_code',
      'zip_code' => 'zip_code',
      'postal_code' => 'zip_code',
      'ssn' => 'ssn',
      'credit_card' => 'credit_card_number',
      'password' => 'password',
      'token' => 'token',
      'api_key' => 'api_key',
      'secret' => 'secret',
      'iban' => 'iban',
      'vat_number' => 'greek_vat',
      'afm' => 'greek_vat',
      'identity_number' => 'identity_number',
      'id_number' => 'identity_number',
      'national_id' => 'identity_number',
      'amka' => 'greek_amka',
      'social_security_number' => 'greek_amka',
      'ssn_greek' => 'greek_amka',
      'personal_number' => 'greek_personal_number',
      'personal_id' => 'greek_personal_number',
      'afm_extended' => 'greek_personal_number',
      'ada' => 'greek_ada',
      'diavgeia_id' => 'greek_ada',
      'decision_number' => 'greek_ada',
      'adam' => 'greek_adam',
      'adam_number' => 'greek_adam',
      'procurement_id' => 'greek_adam',
      'date_of_birth' => 'date_of_birth',
      'birth_date' => 'date_of_birth',
      'dob' => 'date_of_birth',
      'birthdate' => 'date_of_birth'
  }

  # Merge detected fields with defaults (detected fields take precedence)
  anonymize_fields = default_anonymize_fields.merge(detected_fields)

  # Build configuration hash
  config = {
    'database_connections' => detected_databases,
    'grainery_path' => 'db/grainery',
    'lookup_tables' => [],
    'anonymize_fields' => anonymize_fields,
    'last_updated' => Time.now.to_s
  }

  # Write with custom formatting for better readability
  write_config_file(config_path, config)

  puts "  ✓ Created config/grainery.yml with #{detected_databases.size} detected databases"
  puts "  ✓ Detected #{detected_fields.size} anonymizable fields in database schema"
end

#create_load_order_file(load_order, models) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 1085

def create_load_order_file(load_order, models)
  order_path = Rails.root.join(@grainery_path, 'load_order.txt')

  grouped_by_db = load_order.select { |m| models.include?(m) }.group_by { |m| detect_database(m) }

  content = []
  content << "# Load order for harvested seeds"
  content << "# Load files in this order to respect foreign key dependencies"
  content << ""

  grouped_by_db.each do |db_name, db_models|
    content << "# #{db_name.to_s.upcase} Database"
    db_models.each do |model|
      content << "#{db_name}/#{model.table_name}.rb"
    end
    content << ""
  end

  File.write(order_path, content.join("\n"))
  puts "\n  ✓ Load order written to #{@grainery_path}/load_order.txt"
end

#detect_anonymizable_fields(detected_databases) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 106

def detect_anonymizable_fields(detected_databases)
  puts "  → Detecting anonymizable fields from database schema..."

  # Field name patterns mapped to anonymization methods
  field_patterns = {
    /email/i => 'email',
    /first_name/i => 'first_name',
    /last_name/i => 'last_name',
    /^name$/i => 'name',
    /phone/i => 'phone_number',
    /mobile/i => 'phone_number',
    /address/i => 'address',
    /street/i => 'street_address',
    /city/i => 'city',
    /state/i => 'state',
    /zip/i => 'zip_code',
    /postal/i => 'zip_code',
    /ssn/i => 'ssn',
    /credit_card/i => 'credit_card_number',
    /password/i => 'password',
    /token/i => 'token',
    /api_key/i => 'api_key',
    /secret/i => 'secret',
    /iban/i => 'iban',
    /vat_number/i => 'greek_vat',
    /afm/i => 'greek_vat',
    /amka/i => 'greek_amka',
    /social_security_number/i => 'greek_amka',
    /personal_number/i => 'greek_personal_number',
    /personal_id/i => 'greek_personal_number',
    /ada$/i => 'greek_ada',
    /diavgeia/i => 'greek_ada',
    /adam/i => 'greek_adam',
    /procurement_id/i => 'greek_adam',
    /(date_of_)?birth/i => 'date_of_birth',
    /dob$/i => 'date_of_birth',
    /identity_number/i => 'identity_number',
    /national_id/i => 'identity_number'
  }

  detected_fields = {}
  field_locations = Hash.new { |h, k| h[k] = [] } # Track where each field appears

  detected_databases.each do |db_name, db_config|
    begin
      # Get the model base class
      base_class = db_config['model_base_class'].constantize

      # Find all models that inherit from this base class
      models = ObjectSpace.each_object(Class).select do |klass|
        klass < base_class && !klass.abstract_class?
      rescue
        false
      end

      models.each do |model|
        begin
          table_name = model.table_name

          # Get column information
          model.columns.each do |column|
            column_name = column.name

            # Skip internal Rails columns
            next if %w[id created_at updated_at].include?(column_name)

            # Match against patterns
            field_patterns.each do |pattern, method|
              if column_name.match?(pattern)
                # Track location for duplicate detection
                field_locations[column_name] << { db: db_name, table: table_name, model: model.name, method: method }
                puts "    ✓ Found: #{model.name}.#{column_name} → #{method}"
                break # Use first matching pattern
              end
            end
          end
        rescue => e
          # Skip models that can't be analyzed
          next
        end
      end
    rescue => e
      puts "    ⚠ Warning: Could not analyze #{db_name}: #{e.message}"
    end
  end

  # Build detected_fields with scoping when duplicates exist
  field_locations.each do |field_name, locations|
    if locations.size == 1
      # Single occurrence - use simple field name
      detected_fields[field_name] = locations.first[:method]
    else
      # Multiple occurrences - use scoped names
      puts "    ℹ Field '#{field_name}' appears in multiple tables - using scoped configuration"
      locations.each do |loc|
        if locations.count { |l| l[:db] == loc[:db] } > 1
          # Multiple tables in same database - use db.table.field
          scoped_key = "#{loc[:db]}.#{loc[:table]}.#{field_name}"
          detected_fields[scoped_key] = loc[:method]
          puts "      → #{scoped_key}"
        else
          # Single table per database - use table.field
          scoped_key = "#{loc[:table]}.#{field_name}"
          detected_fields[scoped_key] = loc[:method]
          puts "      → #{scoped_key}"
        end
      end
    end
  end

  detected_fields
end

#detect_database(model) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 428

def detect_database(model)
  @database_configs.each do |db_name, db_config|
    base_class_name = db_config[:model_base_class]
    next unless base_class_name

    begin
      base_class = safe_const_get(base_class_name)
      return db_name if model < base_class
    rescue
      next
    end
  end

  :primary
end

#detect_databases_and_models ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 219

def detect_databases_and_models
  puts "  → Detecting databases and model base classes..."

  Rails.application.eager_load!

  # Find all model base classes
  base_classes = ObjectSpace.each_object(Class).select do |klass|
    klass < ActiveRecord::Base &&
    !klass.abstract_class? &&
    klass != ActiveRecord::Base &&
    klass.descendants.any?
  rescue
    false
  end

  connections_map = {}

  base_classes.each do |base_class|
    begin
      connection_config = base_class.connection_db_config
      connection_name = connection_config.name.to_s
      adapter = connection_config.adapter.to_s

      logical_name = infer_logical_name(connection_name, base_class.name)

      connections_map[logical_name] = {
        'connection' => connection_name,
        'adapter' => adapter,
        'model_base_class' => base_class.name
      }

      puts "    ✓ Detected: #{logical_name} → #{base_class.name} (#{adapter})"
    rescue => e
      puts "    ⚠ Warning: Could not detect connection for #{base_class.name}: #{e.message}"
    end
  end

  # Ensure primary database is included
  unless connections_map.key?('primary')
    begin
      primary_config = ApplicationRecord.connection_db_config
      connections_map['primary'] = {
        'connection' => primary_config.name.to_s,
        'adapter' => primary_config.adapter.to_s,
        'model_base_class' => 'ApplicationRecord'
      }
      puts "    ✓ Detected: primary → ApplicationRecord (#{primary_config.adapter})"
    rescue => e
      puts "    ⚠ Warning: Could not detect primary database: #{e.message}"
    end
  end

  connections_map
end

#dump_database_schema(db_name) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 1012

def dump_database_schema(db_name)
  db_config = @database_configs[db_name]
  return unless db_config

  schema_path = Rails.root.join(@grainery_path, db_name.to_s, 'schema.rb')

  begin
    base_class = safe_const_get(db_config[:model_base_class])
    connection = base_class.connection

    # Generate schema dump
    schema_content = []
    schema_content << "# Schema dump for #{db_name} database"
    schema_content << "# Generated: #{Time.now}"
    schema_content << "# Adapter: #{db_config[:adapter]}"
    schema_content << ""
    schema_content << "ActiveRecord::Schema.define do"
    schema_content << ""

    # Get all tables for this connection
    tables = connection.tables.sort

    tables.each do |table_name|
      # Skip internal Rails tables
      next if ['schema_migrations', 'ar_internal_metadata'].include?(table_name)

      schema_content << "  create_table \"#{table_name}\", force: :cascade do |t|"

      # Get columns
      connection.columns(table_name).each do |column|
        next if column.name == 'id' # Primary key is handled by create_table

        type = column.type
        attrs = []
        attrs << "limit: #{column.limit}" if column.limit
        attrs << "precision: #{column.precision}" if column.precision
        attrs << "scale: #{column.scale}" if column.scale
        attrs << "null: false" unless column.null
        attrs << "default: #{column.default.inspect}" if column.default

        attrs_str = attrs.any? ? ", #{attrs.join(', ')}" : ""
        schema_content << "    t.#{type} \"#{column.name}\"#{attrs_str}"
      end

      schema_content << "  end"
      schema_content << ""

      # Get indexes
      connection.indexes(table_name).each do |index|
        columns = index.columns.is_a?(Array) ? index.columns : [index.columns]
        options = []
        options << "name: \"#{index.name}\"" if index.name
        options << "unique: true" if index.unique

        columns_str = columns.size == 1 ? "\"#{columns.first}\"" : "[#{columns.map { |c| "\"#{c}\"" }.join(', ')}]"
        options_str = options.any? ? ", #{options.join(', ')}" : ""

        schema_content << "  add_index \"#{table_name}\", #{columns_str}#{options_str}"
      end

      schema_content << "" if connection.indexes(table_name).any?
    end

    schema_content << "end"
    schema_content << ""

    File.write(schema_path, schema_content.join("\n"))
    puts "  ✓ Schema dumped for #{db_name} → schema.rb"
  rescue => e
    puts "  ✗ Error dumping schema for #{db_name}: #{e.message}"
  end
end

#format_seed_value(value, column) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 989

def format_seed_value(value, column)
  return 'nil' if value.nil?

  case column.type
  when :string, :text
    value.to_s.inspect
  when :integer, :bigint
    value.to_i
  when :decimal, :float
    value.to_f
  when :boolean
    value ? 'true' : 'false'
  when :date
    "Date.parse(#{value.to_s.inspect})"
  when :datetime, :timestamp
    "Time.parse(#{value.to_s.inspect})"
  when :json, :jsonb
    value.to_json
  else
    value.inspect
  end
end

#generate_api_key(column) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 750

def generate_api_key(column)
  # Generate API key respecting column size
  length = column.limit ? [column.limit, 40].min : 40
  Faker::Alphanumeric.alphanumeric(number: length)
end

#generate_fake_date_of_birth(original_value, column) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 928

def generate_fake_date_of_birth(original_value, column)
  # Generate a fake date of birth preserving approximate age (adulthood)
  # Strategy: Keep the year roughly the same (within +/- 2 years) to preserve age category

  return Faker::Date.birthday(min_age: 18, max_age: 80) if original_value.nil?

  begin
    # Parse the original date
    original_date = case original_value
    when Date
      original_value
    when Time, DateTime
      original_value.to_date
    when String
      Date.parse(original_value)
    else
      return Faker::Date.birthday(min_age: 18, max_age: 80)
    end

    # Calculate age
    today = Date.today
    age = today.year - original_date.year
    age -= 1 if today < original_date + age.years

    # Generate a new birth date with similar age (+/- 2 years)
    min_age = [age - 2, 18].max  # Preserve adulthood (minimum 18)
    max_age = age + 2

    Faker::Date.birthday(min_age: min_age, max_age: max_age)
  rescue
    # Fallback if parsing fails
    Faker::Date.birthday(min_age: 18, max_age: 80)
  end
end

#generate_fake_greek_ada(column) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 872

def generate_fake_greek_ada(column)
  # Generate a fake Greek ADA (Diavgeia Decision Number)
  # Format: 4 Greek uppercase letters + 2 digits + 4 Greek uppercase letters + dash + 1 digit + 2 Greek uppercase letters
  # Example: ΨΚΕΘ46ΜΤΛΠ-7ΗΠ

  greek_letters = ['Α', 'Β', 'Γ', 'Δ', 'Ε', 'Ζ', 'Η', 'Θ', 'Ι', 'Κ', 'Λ', 'Μ', 'Ν', 'Ξ', 'Ο', 'Π', 'Ρ', 'Σ', 'Τ', 'Υ', 'Φ', 'Χ', 'Ψ', 'Ω']

  # First part: 4 Greek uppercase letters
  part1 = 4.times.map { greek_letters.sample }.join

  # 2 digits
  digits1 = 2.times.map { rand(0..9) }.join

  # Second part: 4 Greek uppercase letters
  part2 = 4.times.map { greek_letters.sample }.join

  # After dash: 1 digit
  digit2 = rand(0..9).to_s

  # Final part: 2 Greek uppercase letters
  part3 = 2.times.map { greek_letters.sample }.join

  ada = "#{part1}#{digits1}#{part2}-#{digit2}#{part3}"

  # Adjust length if column has a limit
  if column.limit && column.limit < 15
    ada[0...column.limit]
  else
    ada
  end
end

#generate_fake_greek_adam(column) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 904

def generate_fake_greek_adam(column)
  # Generate a fake Greek ADAM number (Public Procurement Publicity identifier)
  # Format: 2 digits + PROC or REQ + 9 digits
  # Examples: 21PROC009041696, 21REQ008902853

  # First 2 digits (year)
  year_part = 2.times.map { rand(0..9) }.join

  # Category type (always PROC or REQ)
  category = ['PROC', 'REQ'].sample

  # 9 digits (sequential number)
  sequence = 9.times.map { rand(0..9) }.join

  adam = "#{year_part}#{category}#{sequence}"

  # Adjust length if column has a limit
  if column.limit && column.limit < adam.length
    adam[0...column.limit]
  else
    adam
  end
end

#generate_fake_greek_amka(column) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 806

def generate_fake_greek_amka(column)
  # Generate a fake Greek AMKA (Social Security Number - 11 digits)
  # Format: DDMMYY followed by 5 digits
  # Example: 01011990001 (1st January 1990, sequence 001)

  # Generate random date (between 1950 and 2005 for realistic working age)
  day = rand(1..28).to_s.rjust(2, '0')
  month = rand(1..12).to_s.rjust(2, '0')
  year = rand(50..105).to_s.rjust(2, '0')  # Last 2 digits of year
  sequence = rand(0..99999).to_s.rjust(5, '0')

  amka = "#{day}#{month}#{year}#{sequence}"

  # Adjust length if column has a limit
  if column.limit
    if column.limit >= 11
      amka
    elsif column.limit > 0
      # Truncate if needed
      amka[0...column.limit]
    else
      amka[0...column.limit]
    end
  else
    amka
  end
end

#generate_fake_greek_personal_number(column) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 834

def generate_fake_greek_personal_number(column)
  # Generate a fake Greek Personal Number (12 characters)
  # Format: 2 digits + 1 letter + 9-digit AFM
  # Example: 12A123456789 (prefix: 12A, AFM: 123456789)

  # Generate 2-digit prefix
  prefix_digits = rand(10..99).to_s

  # Generate random letter
  letters = ('A'..'Z').to_a
  prefix_letter = letters.sample

  # Generate AFM (9 digits)
  afm = rand(100000000..999999999).to_s

  personal_number = "#{prefix_digits}#{prefix_letter}#{afm}"

  # Adjust length if column has a limit
  if column.limit
    if column.limit >= 12
      personal_number
    elsif column.limit >= 10
      # Try to keep prefix + partial AFM
      personal_number[0...column.limit]
    elsif column.limit >= 3
      # Keep at least the prefix
      personal_number[0...column.limit]
    elsif column.limit > 0
      # Very short, just use digits
      rand(10 ** (column.limit - 1)...10 ** column.limit).to_s
    else
      personal_number[0...column.limit]
    end
  else
    personal_number
  end
end

#generate_fake_greek_vat(column) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 784

def generate_fake_greek_vat(column)
  # Generate a fake Greek VAT number (AFM - 9 digits)
  # Format: 9 digits
  vat = rand(100000000..999999999).to_s

  # Adjust length if column has a limit
  if column.limit
    if column.limit >= 9
      vat
    elsif column.limit > 0
      # Generate shorter number
      max_val = (10 ** column.limit) - 1
      min_val = 10 ** (column.limit - 1)
      rand(min_val..max_val).to_s
    else
      vat[0...column.limit]
    end
  else
    vat
  end
end

#generate_fake_iban(column) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 762

def generate_fake_iban(column)
  # Generate a fake Greek IBAN (27 characters)
  # Format: GR + 2 check digits + 7 bank code + 16 account number
  country_code = 'GR'
  check_digits = rand(10..99).to_s
  bank_code = rand(1000000..9999999).to_s
   = rand(1000000000000000..9999999999999999).to_s
  iban = "#{country_code}#{check_digits}#{bank_code}#{}"

  # Truncate if column has a limit
  if column.limit && iban.length > column.limit
    # Keep the country code prefix if possible
    if column.limit >= 4
      iban = iban[0...column.limit]
    else
      iban = iban[0...column.limit]
    end
  end

  iban
end

#generate_fake_identity_number(column) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 963

def generate_fake_identity_number(column)
  # Generate a fake identity number (generic format)
  # Using alphanumeric format similar to national ID cards
  letters = ('A'..'Z').to_a

  if column.limit
    if column.limit >= 8
      # Full format: 2 letters + 6 digits
      "#{letters.sample}#{letters.sample}#{rand(100000..999999)}"
    elsif column.limit >= 2
      # Adjust format to fit column size
      num_letters = [2, column.limit / 2].min
      num_digits = column.limit - num_letters
      letter_part = num_letters.times.map { letters.sample }.join
      digit_part = num_digits > 0 ? rand(10 ** (num_digits - 1)...10 ** num_digits).to_s : ''
      "#{letter_part}#{digit_part}"
    else
      # Very small limit, just use letters
      column.limit.times.map { letters.sample }.join
    end
  else
    # No limit, use default format
    "#{letters.sample}#{letters.sample}#{rand(100000..999999)}"
  end
end

#generate_secret(column) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 756

def generate_secret(column)
  # Generate secret respecting column size
  length = column.limit ? [column.limit, 64].min : 64
  Faker::Alphanumeric.alphanumeric(number: length)
end

#generate_seed_content(model, records, db_name, anonymize: true) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 606

def generate_seed_content(model, records, db_name, anonymize: true)
  table_name = model.table_name

  # Get columns to export (exclude id, timestamps)
  columns = model.columns.reject do |col|
    %w[id created_at updated_at].include?(col.name)
  end

  content = []
  content << "# Harvested from #{db_name} database: #{table_name}"
  content << "# Records: #{records.size}"
  content << "# Generated: #{Time.now}"
  content << "# Anonymized: #{anonymize && @anonymize_fields.any? ? 'YES' : 'NO'}"
  content << ""
  content << "#{model.name}.create!("

  records.each_with_index do |record, idx|
    content << "  {" if idx == 0
    content << "  }," if idx > 0
    content << "  {" if idx > 0

    columns.each_with_index do |col, col_idx|
      value = record.send(col.name)

      # Anonymize if enabled and field is configured
      if anonymize
        faker_method = get_anonymization_method(col.name, table_name, db_name)
        if faker_method
          # Skip anonymization if explicitly set to "skip"
          unless faker_method.to_s == 'skip'
            value = anonymize_value(col.name, faker_method, col, value)
          end
        end
      end

      formatted_value = format_seed_value(value, col)
      comma = col_idx < columns.size - 1 ? ',' : ''
      content << "    #{col.name}: #{formatted_value}#{comma}"
    end
  end

  content << "  }"
  content << ")"
  content << ""

  content.join("\n")
end

#generate_token(column) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 744

def generate_token(column)
  # Generate token respecting column size
  length = column.limit ? [column.limit, 32].min : 32
  Faker::Alphanumeric.alphanumeric(number: length)
end

#get_all_models ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 409

def get_all_models
  Rails.application.eager_load!
  models = []

  @database_configs.each do |db_name, db_config|
    base_class_name = db_config[:model_base_class]
    next unless base_class_name

    begin
      base_class = safe_const_get(base_class_name)
      models += base_class.descendants
    rescue => e
      puts "  Warning: Could not load models from '#{base_class_name}': #{e.message}"
    end
  end

  models.uniq.compact
end

#get_anonymization_method(field_name, table_name, db_name) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 654

def get_anonymization_method(field_name, table_name, db_name)
  # Priority order:
  # 1. database.table.field (most specific)
  # 2. table.field (table-specific)
  # 3. field (global)

  scoped_key_db_table = "#{db_name}.#{table_name}.#{field_name}"
  scoped_key_table = "#{table_name}.#{field_name}"

  @anonymize_fields[scoped_key_db_table] ||
    @anonymize_fields[scoped_key_table] ||
    @anonymize_fields[field_name]
end

#get_seed_path(model, db_name) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 600

def get_seed_path(model, db_name)
  db_dir = File.join(@grainery_path, db_name.to_s)
  FileUtils.mkdir_p(Rails.root.join(db_dir))
  Rails.root.join(db_dir, "#{model.table_name}.rb")
end

#harvest_all(limit: nil, dump_schema: false, anonymize: true) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 444

def harvest_all(limit: nil, dump_schema: false, anonymize: true)
  all_models = get_all_models

  models_to_harvest = all_models.reject do |model|
    model.abstract_class? ||
    model.name.start_with?('HABTM_', 'ActiveRecord::') ||
    model.table_name.nil?
  end

  harvest_models(models_to_harvest, limit: limit, dump_schema: dump_schema, anonymize: anonymize)
end

#harvest_models(models, limit: nil, dump_schema: false, anonymize: true) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 456

def harvest_models(models, limit: nil, dump_schema: false, anonymize: true)
  models = Array(models)
  return if models.empty?

  # Require faker if anonymization is enabled
  if anonymize && @anonymize_fields.any?
    begin
      require 'faker'
    rescue LoadError
      puts "  ⚠ Warning: Faker gem not found. Anonymization disabled."
      puts "    Install with: gem install faker"
      anonymize = false
    end
  end

  puts "\n" + "="*80
  puts "Grainer - Extracting Database Seeds"
  puts "="*80
  puts "Total models: #{models.size}"
  puts "Limit per table: #{limit || 'ALL RECORDS'}"
  puts "Schema dump: #{dump_schema ? 'YES' : 'NO'}"
  puts "Anonymization: #{anonymize && @anonymize_fields.any? ? "YES (#{@anonymize_fields.size} fields)" : 'NO'}"
  puts "="*80 + "\n"

  # Group by database
  grouped_models = models.group_by { |model| detect_database(model) }

  # Calculate dependencies for load order
  dependency_graph = build_dependency_graph(models)
  load_order = topological_sort(dependency_graph)

  # Create harvest directories
  grouped_models.each do |db_name, _|
    db_dir = Rails.root.join(@grainery_path, db_name.to_s)
    FileUtils.mkdir_p(db_dir)
  end

  # Dump schemas if requested
  if dump_schema
    puts "\n" + "-"*80
    puts "Dumping Database Schemas"
    puts "-"*80
    grouped_models.each do |db_name, _|
      dump_database_schema(db_name)
    end
  end

  # Harvest in dependency order
  load_order.each do |model|
    next unless models.include?(model)

    begin
      db_name = detect_database(model)
      harvest_table(model, db_name, limit: limit, anonymize: anonymize)
    rescue => e
      puts "  ✗ Error harvesting #{model.name}: #{e.message}"
    end
  end

  # Create load order file
  create_load_order_file(load_order, models)

  puts "\n" + "="*80
  puts "Data harvest complete!"
  puts "Seed files created in #{@grainery_path}/"
  puts "Load with: rake grainery:load"
  puts "="*80
end

#harvest_table(model, db_name, limit: nil, anonymize: true) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 571

def harvest_table(model, db_name, limit: nil, anonymize: true)
  table_name = model.table_name
  is_lookup = @lookup_tables.include?(table_name)

  # Determine how many records to harvest
  records = if is_lookup
    model.all.to_a
  elsif limit
    model.limit(limit).to_a
  else
    model.all.to_a
  end

  if records.empty?
    puts "  ⚠ #{model.name.ljust(50)} → skipped (no data)"
    return
  end

  # Generate seed file
  seed_content = generate_seed_content(model, records, db_name, anonymize: anonymize)
  seed_path = get_seed_path(model, db_name)

  File.write(seed_path, seed_content)

  anonymize_suffix = anonymize && @anonymize_fields.any? ? " [anonymized]" : ""
  record_info = is_lookup ? " (lookup: #{records.size} records)" : " (#{records.size} records)"
  puts "  ✓ #{model.name.ljust(50)} → #{table_name}.rb#{record_info}#{anonymize_suffix}"
end

#infer_logical_name(connection_name, class_name) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 274

def infer_logical_name(connection_name, class_name)
  logical = class_name.gsub(/DB$|Database$|Connection$/, '')
  logical = logical.gsub(/([A-Z]+)([A-Z][a-z])/, '\\1_\\2')
                   .gsub(/([a-z\d])([A-Z])/, '\\1_\\2')
                   .downcase

  if connection_name != 'test' && connection_name.length > logical.length
    logical = connection_name.gsub(/_db$|_database$/, '')
  end

  logical
end

#load_anonymize_fields ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 390

def load_anonymize_fields
  fields = @config['anonymize_fields'] || {}
  fields.is_a?(Hash) ? fields : {}
rescue => e
  puts "  Warning: Could not load anonymize_fields: #{e.message}"
  {}
end

#load_config ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 19

def load_config
  config_path = Rails.root.join('config/grainery.yml')

  unless File.exist?(config_path)
    puts "  Warning: config/grainery.yml not found. Creating default configuration..."
    create_default_config
  end

  YAML.safe_load_file(config_path, permitted_classes: [Symbol, Date, Time], aliases: true) || {}
rescue => e
  puts "  Warning: Could not load grainery.yml: #{e.message}"
  {}
end

#load_database_connections ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 341

def load_database_connections
  connections = @config['database_connections'] || {}
  result = {}

  connections.each do |db_name, config|
    db_key = db_name.to_sym
    if config.is_a?(Hash)
      result[db_key] = {
        connection: config['connection'].to_sym,
        adapter: config['adapter']&.to_sym || :sqlserver,
        model_base_class: config['model_base_class'] || 'ApplicationRecord'
      }
    else
      result[db_key] = {
        connection: config.to_sym,
        adapter: :sqlserver,
        model_base_class: 'ApplicationRecord'
      }
    end
  end
  result
end

#load_grainery_path ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 364

def load_grainery_path
  path = @config['grainery_path'] || 'db/grainery'
  path = path.sub(/\/$/, '')

  # Security: Validate path is within Rails.root to prevent path traversal
  full_path = Rails.root.join(path).expand_path
  unless full_path.to_s.start_with?(Rails.root.to_s)
    raise SecurityError, "Invalid grainery_path '#{path}': must be within Rails application directory"
  end

  path
rescue SecurityError => e
  puts "  Error: #{e.message}"
  raise
rescue => e
  puts "  Warning: Could not load grainery_path: #{e.message}"
  'db/grainery'
end

#load_lookup_tables ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 383

def load_lookup_tables
  (@config['lookup_tables'] || []).to_set
rescue => e
  puts "  Warning: Could not load lookup tables: #{e.message}"
  Set.new
end

#load_seeds(load_schema: false) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 1107

def load_seeds(load_schema: false)
  order_file = Rails.root.join(@grainery_path, 'load_order.txt')

  unless File.exist?(order_file)
    puts "  ✗ Load order file not found. Run 'rake grainery:generate' first."
    return
  end

  puts "\n" + "="*80
  puts "Loading Harvested Seeds"
  puts "="*80
  puts "Load schema: #{load_schema ? 'YES' : 'NO'}"
  puts "="*80

  # Load schemas first if requested
  if load_schema
    puts "\n" + "-"*80
    puts "Loading Database Schemas"
    puts "-"*80

    @database_configs.each do |db_name, _|
      schema_file = Rails.root.join(@grainery_path, db_name.to_s, 'schema.rb')
      if File.exist?(schema_file)
        puts "  → Loading schema for #{db_name}..."
        begin
          load schema_file
        rescue => e
          puts "  ✗ Error loading schema for #{db_name}: #{e.message}"
        end
      else
        puts "  ⚠ No schema file found for #{db_name}"
      end
    end
  end

  # Load harvested seeds in dependency order
  puts "\n" + "-"*80
  puts "Loading Seed Data"
  puts "-"*80

  File.readlines(order_file).each do |line|
    line = line.strip
    next if line.empty? || line.start_with?('#')

    seed_file = Rails.root.join(@grainery_path, line)
    if File.exist?(seed_file)
      puts "  → Loading #{line}..."
      begin
        load seed_file
      rescue => e
        puts "  ✗ Error loading #{line}: #{e.message}"
      end
    end
  end

  # Load custom seeds last (if they exist)
  custom_seeds = Rails.root.join('db/seeds.rb')
  if File.exist?(custom_seeds) && File.read(custom_seeds).strip.present?
    puts "\n" + "-"*80
    puts "Loading Custom Seeds"
    puts "-"*80
    puts "  → Loading db/seeds.rb..."
    begin
      load custom_seeds
    rescue => e
      puts "  ✗ Error loading custom seeds: #{e.message}"
    end
  end

  puts "\n" + "="*80
  puts "Seed loading complete!"
  puts "="*80
end

#safe_const_get(class_name) ⇒ Object

Security: Safe constant resolution with whitelist



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# File 'lib/grainery/grainer.rb', line 399

def safe_const_get(class_name)
  unless class_name.match?(ALLOWED_BASE_CLASS_PATTERN)
    raise SecurityError, "Unauthorized base class '#{class_name}'. Only ActiveRecord model base classes are allowed."
  end

  Object.const_get(class_name)
rescue NameError => e
  raise NameError, "Could not find constant '#{class_name}': #{e.message}"
end

#topological_sort(graph) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 546

def topological_sort(graph)
  sorted = []
  visited = Set.new
  visiting = Set.new

  visit = lambda do |node|
    return if visited.include?(node)
    raise "Circular dependency detected" if visiting.include?(node)

    visiting.add(node)

    (graph[node] || []).each do |dependency|
      visit.call(dependency) if graph.key?(dependency)
    end

    visiting.delete(node)
    visited.add(node)
    sorted << node
  end

  graph.keys.each { |node| visit.call(node) }

  sorted
end

#write_config_file(path, config) ⇒ Object 



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# File 'lib/grainery/grainer.rb', line 287

def write_config_file(path, config)
  content = []

  content << "# Data Harvest Configuration"
  content << "# This file contains configuration for the data harvesting system"
  content << "#"
  content << "# Database Connections:"
  content << "# Map of logical database names to connection name, adapter, and model base class"
  content << "#"
  content << "# Harvest Path:"
  content << "# Where harvested seed files are stored (default: db/grainery)"
  content << "#"
  content << "# Lookup Tables:"
  content << "# Tables to harvest ALL records (not just samples)"
  content << ""
  content << "# Path for harvested seed files"
  content << "grainery_path: #{config['grainery_path'] || 'db/grainery'}"
  content << ""
  content << "# Database connection mappings"
  content << "database_connections:"

  config['database_connections'].each do |db_name, db_config|
    content << "  #{db_name}:"
    content << "    connection: #{db_config['connection']}"
    content << "    adapter: #{db_config['adapter']}"
    content << "    model_base_class: #{db_config['model_base_class']}"
  end

  content << ""
  content << "# Lookup tables (harvest all records)"
  content << "lookup_tables: #{config['lookup_tables'].inspect}"
  content << ""
  content << "# Field anonymization (column_name => faker_method)"
  content << "# Set to empty hash {} to disable anonymization"
  content << "# Faker methods: email, first_name, last_name, name, phone_number, address,"
  content << "#                street_address, city, state, zip_code, ssn, credit_card_number,"
  content << "#                password, token, api_key, secret, iban, greek_vat, greek_amka,"
  content << "#                greek_personal_number, greek_ada, identity_number"
  content << "anonymize_fields:"
  if config['anonymize_fields']&.any?
    config['anonymize_fields'].each do |field, faker_method|
      content << "  #{field}: #{faker_method}"
    end
  else
    content << "  {}"
  end
  content << ""
  content << "# Metadata"
  content << "last_updated: #{config['last_updated']}"
  content << ""

  File.write(path, content.join("\n"))
end