Class: RussellEdge::DataMigrator

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

Constant Summary collapse

REMOVE_FILES_REGEX = 
/^\./

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(migrations_path = nil) ⇒ DataMigrator

Returns a new instance of DataMigrator.



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# File 'lib/data_migrator.rb', line 91

def initialize(migrations_path=nil)
  @default_migrations_path = migrations_path || "#{Rails.root}/db/data_migrations"
end

Class Method Details

.copy(destination, sources, options = {}) ⇒ Object 



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# File 'lib/data_migrator.rb', line 53

def copy(destination, sources, options = {})
  copied = []

  FileUtils.mkdir_p(destination) unless File.exists?(destination)

  destination_migrations = migrations(destination)
  last = destination_migrations.last
  sources.each do |scope, path|
    migrations(path).each do |migration|
      source = File.read(migration[:filename])
      source = "# This migration comes from #{scope} (originally #{migration[:version]})\n#{source}"

      if duplicate = destination_migrations.detect { |m| m[:name] == migration[:name] }
        if options[:refresh] && duplicate[:scope] == scope.to_s
          Dir.glob(File.join(destination,"*_#{migration[:name].underscore}.#{scope.to_s}.rb")).each { |f| puts "Removing old migration #{migration[:name]}"; File.delete(f) }
        elsif options[:on_skip] && duplicate[:scope] != scope.to_s
          options[:on_skip].call(scope, migration)
        end
        next unless options[:refresh]
      end

      migration[:version] = next_migration_number(last ? last[:version] + 1 : 0).to_i unless options[:preserve_timestamp]
      new_path = File.join(destination, "#{migration[:version]}_#{migration[:name].underscore}.#{scope}.rb")
      old_path, migration[:filename] = migration[:filename], new_path
      last = migration

      File.open(migration[:filename], "w") { |f| f.write source }
      copied << migration
      options[:on_copy].call(scope, migration, old_path) if options[:on_copy]
      destination_migrations << migration
    end
  end

  copied
end

.initialize_data_migrations_table ⇒ Object 



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# File 'lib/data_migrator.rb', line 47

def initialize_data_migrations_table
  puts "** data_migrations table missing creating now...."
  puts ActiveRecord::Migrator.run(:up, File.join(File.dirname(__FILE__), '../db/migrate/'), 20100819181805)
  puts "** done"
end

.migrations(path) ⇒ Object 



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# File 'lib/data_migrator.rb', line 20

def migrations(path)
  files = Dir["#{path}/**/[0-9]*_*.rb" ]

  seen = Hash.new false

  migrations = files.map do |file|
    version, name, scope = file.scan(/([0-9]+)_([_a-z0-9]*)\.?([_a-z0-9]*)?.rb/).first

    raise ActiveRecord::IllegalMigrationNameError.new(file) unless version
    version = version.to_i
    name = name.camelize

    raise ActiveRecord::DuplicateMigrationVersionError.new(version) if seen[version]
    raise ActiveRecord::DuplicateMigrationNameError.new(name) if seen[name]

    seen[version] = seen[name] = true

    {:name => name, :filename => file, :version => version, :scope => scope}
  end

  migrations.sort_by{|h| h[:version]}
end

.migrations_path ⇒ Object 



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# File 'lib/data_migrator.rb', line 16

def migrations_path
  "#{Rails.root}/db/data_migrations/"
end

.next_migration_number(number) ⇒ Object 



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# File 'lib/data_migrator.rb', line 43

def next_migration_number(number)
  [Time.now.utc.strftime("%Y%m%d%H%M%S"), "%.14d" % number].max
end

Instance Method Details

#get_current_version ⇒ Object 



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# File 'lib/data_migrator.rb', line 121

def get_current_version
  result = ActiveRecord::Base.connection.select_all("select max(version) as current_version from data_migrations")

  current_version = result[0]['current_version'] unless result == -1

  current_version = current_version.to_i unless current_version.nil?

  current_version
end

#migrate(passed_location = nil, passed_version = nil) ⇒ Object 



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# File 'lib/data_migrator.rb', line 95

def migrate(passed_location=nil, passed_version=nil)
  setup

  location = passed_location.nil? ? @default_migrations_path : passed_location
  @@current_version = get_current_version

  if passed_version.nil? || @@current_version.nil?
    run_all_non_migrated(passed_version)
  elsif passed_version < @@current_version
    handle_lower_passed_version(passed_version)
  elsif passed_version > @@current_version
    handle_higher_passed_version(passed_version)
  end
end

#pending_migrations ⇒ Object 



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# File 'lib/data_migrator.rb', line 110

def pending_migrations
  versions = []
  files = get_all_files
  files.each do |file|
    filename, version, klass_name = separate_file_parts(file)
    versions << filename unless version_has_been_migrated?(version)
  end

  versions
end

#run_down(passed_version) ⇒ Object 



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# File 'lib/data_migrator.rb', line 151

def run_down(passed_version)
  setup

  raise "VERSION is required" unless passed_version

  files = get_all_files
  found = false

  files.each do |file|
    filename, version, klass_name = separate_file_parts(file)
    if passed_version == version
      found = true
      (version_has_been_migrated?(version)) ? handle_action(file, klass_name, version, :down) : (puts "** Version #{passed_version} has not been migrated")
    end
  end

  puts "** Version #{passed_version} not found" unless found

end

#run_up(passed_version) ⇒ Object 



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# File 'lib/data_migrator.rb', line 131

def run_up(passed_version)
  setup

  raise "VERSION is required" unless passed_version

  files = get_all_files
  found = false

  files.each do |file|
    filename, version, klass_name = separate_file_parts(file)
    if passed_version == version
      found = true
      (version_has_been_migrated?(version)) ? (puts "** Version #{passed_version} has already been migrated") : handle_action(file, klass_name, version, :up)
    end
  end

  puts "** Version #{passed_version} not found" unless found

end