Module: ForeignKeyChecker::Utils::BelongsTo

Defined in:
lib/foreign_key_checker/utils/belongs_to.rb

Defined Under Namespace

Classes: ColumnLevel, Result, TableLevel, WayPoint

Constant Summary collapse

CONST_REGEXP = 
/\A[A-Z]\p{Alnum}*(::\p{Alnum}+)*\z/

Class Method Summary collapse

Class Method Details

.all_association_candidates(connection, polymorphic_suffixes: ['_type'], on_error: proc {}) ⇒ Object 



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# File 'lib/foreign_key_checker/utils/belongs_to.rb', line 349

def self.all_association_candidates(connection, polymorphic_suffixes: ['_type'], on_error: proc {})
  belongs_to = all_candidates(connection, polymorphic_suffixes: ['_type'], on_error: proc {})
  has_many = inverse(belongs_to)
  belongs_to.each_with_object({}) do |(table, bt_associations), object|
    object[table] = {belongs_to: bt_associations, has_many: has_many[table] || []}
  end
end

.all_candidates(connection, polymorphic_suffixes: ['_type'], on_error: proc {}) ⇒ Object 



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# File 'lib/foreign_key_checker/utils/belongs_to.rb', line 342

def self.all_candidates(connection, polymorphic_suffixes: ['_type'], on_error: proc {})
  merge_candidates(
    fk_candidates(connection, polymorphic_suffixes: polymorphic_suffixes, on_error: on_error),
    column_name_candidates(connection, polymorphic_suffixes: polymorphic_suffixes, on_error: on_error)
  )
end

.build_classes(model, polymorphic_suffixes: ['_type'], on_error: proc {}) ⇒ Object

ForeignKeyChecker::Utils::BelongsTo.build_classes(User)



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# File 'lib/foreign_key_checker/utils/belongs_to.rb', line 393

def self.build_classes(model, polymorphic_suffixes: ['_type'], on_error: proc {})
  @build_classes ||= begin
    mapping = build_table_mapping(model: model)
    build_class_name = proc { |table| mapping[table] }
    all_association_candidates(model.connection, polymorphic_suffixes: polymorphic_suffixes, on_error: on_error).map do |table, hash|
      hash.transform_values { |results| results.map { |result| result.build_class_name = build_class_name; result }}.merge(
        table_name: table,
        class_name: mapping[table],
      )
    end
  end
end

.build_delete_chain(scope, nullify = {}, **args) ⇒ Object

ForeignKeyChecker::Utils::BelongsTo.build_delete_chain(City.where(slug: ‘paris’), :capital_city_id, cities: %i[curator_id main_city_id]) ForeignKeyChecker::Utils::BelongsTo.build_delete_chain(City.where(slug: ‘paris’), :capital_city_id, cities: %i[curator_id main_city_id], local_profiles: :published_edition_id, hint_places: :place_image_id, {})



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# File 'lib/foreign_key_checker/utils/belongs_to.rb', line 408

def self.build_delete_chain(scope, nullify = {}, **args)
  tree = build_hm_tree(scope.model, **args)
  all_ids = []
  dependencies = {}
  triggers = {}
  cmds = [proc { |*args| __ids = scope.pluck(:id); all_ids << [scope.model.table_name, __ids, []]; __ids}]
  process_tree = proc do |_tree, way|
    _tree.each do |table, data|
      cmds << proc do |*args|
        primary_table = data[:associations].first.primary_table
        ids = all_ids.select { |tn, __ids| tn == primary_table }.map(&:second).reduce(&:+).uniq
        _id_fks = []
        data[:associations].each do |association|
          association.select_sql_with_fk(ids.dup).try do |sql|
            begin
              if Array.wrap(nullify[association.dependant_table.to_sym]).include?(association.foreign_key.to_sym)
                ids.in_groups_of(1000, false).each do |group|
                  all_ids << [";sql;", association.nullify_sql(group), way]
                end
                next
              end

              p way
              _id_fks += association.connection.select_all(*sql).rows
            rescue => e
              raise e unless e.message.tr('"', '').include?("column id does not exist")
              ids.in_groups_of(1000, false).each do |group|
                all_ids << [";sql;", association.delete_sql(group), way]
              end
              puts e.message
            end
          end
        end
        _id_fks.each do |_id, _fk|
          dependencies[primary_table] ||= {}
          dependencies[primary_table][_fk] ||= Set.new
          dependencies[primary_table][_fk] << [table, _id]

          triggers[table] ||= {}
          triggers[table][_id] ||= Set.new
          triggers[table][_id] << [primary_table, _fk]
        end
        _ids = _id_fks.map(&:first).uniq - (all_ids.select { |tn, __ids| tn == table }.map(&:second).reduce([], &:+).uniq)
        if _ids.any?
          all_ids << [table, _ids, way]
          data[:children].presence.try { |ch| process_tree.call(ch, way + [table]) }
        end
        _ids
      end
    end
  end
  process_tree.call(tree, [scope.model.table_name])
  arg = nil
  cmds.each do |cmd|
    arg = cmd.call(arg)
  end
  sql_queries = all_ids.select { |a, b, c| a == ';sql;' }.map(&:second)
  t_ids = all_ids.reject { |a, b, c| a == ';sql;' }.group_by(&:first).transform_values { |vs| vs.map(&:second).reduce([], &:+).uniq }.to_a
  loop do
    break unless t_ids.map(&:second).any?(&:any?)
    any = false
    t_ids.each do |table, ids|
      _ids = ids.select { |id| dependencies.dig(table, id).blank? }
      ids.reject! { |id| dependencies.dig(table, id).blank? }
      if _ids.present?
        any = true
        _ids.in_groups_of(1000, false).each do |ids_group|
          sql_queries << ["DELETE FROM #{scope.model.connection.quote_table_name(table)} WHERE id IN (#{ids_group.map(&:to_i).join(',')})"]
        end
        _ids.each do |id|
          triggers.dig(table, id)&.each do |keys|
            dependencies.dig(*keys).delete([table, id])
          end
        end
      end
    end
    unless any
      puts "Cannot destroy these objects. Check cyclic relation chains:\n#{find_cycles(tree, [scope.model.table_name]).inspect}"
      return []
    end
  end
  sql_queries
end

.build_hm_tree(model, **args) ⇒ Object

ForeignKeyChecker::Utils::BelongsTo.build_hm_tree(User) построит дерево зависимостей от модели User find_cycle = proc { |node, way| puts way.join(‘->’); next [way] if node.nil?; node.each_with_object([]) { |(key, item), obj| ways = way.include?(key) ? [way + [key]] : find_cycle.call(item, way + [key]); ways.each { |w| obj.push(w) } } v}



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# File 'lib/foreign_key_checker/utils/belongs_to.rb', line 549

def self.build_hm_tree(model, **args)
  mapping = build_table_mapping(model: model)
  hash = build_classes(model, **args).group_by do |result|
    result[:table_name]
  end
  found = {}
  processing = {}
  should_fill = []
  find_children = proc do |c_table_name|
    processing[c_table_name] = true
    hash[c_table_name].each_with_object({}) do |results, object|
      perform_result = proc do |result|
        key = result.dependant_table
        object[key] ||= {associations: []}
        object[key][:associations].push(result)

        if processing[key]
          should_fill.push([key, object[key]])
          next
        end

        found[key] ||= find_children.call(key)
        object[key][:children] ||= found[key]
      end
      results[:has_many].each(&perform_result)
      hash.each_value do |hs|
        hs.each do |h|
          h[:belongs_to].each do |r|
            next unless r.polymorphic && r.types.include?(mapping[c_table_name])

            perform_result.call(r.inversed_association(c_table_name))
          end
        end
      end
    end
  end
  ret = find_children.call(model.table_name)
  should_fill.each do |table_name, item|
    item[:children] = found[table_name]
  end
  ret
end

.build_table_mapping(model: ActiveRecord::Base, module_if_gt: 3) ⇒ Object 



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# File 'lib/foreign_key_checker/utils/belongs_to.rb', line 285

def self.build_table_mapping(model: ActiveRecord::Base, module_if_gt: 3)
  Rails.application.eager_load!
  base_class = model
  loop do
    if !base_class.superclass.respond_to?(:connection) || base_class.superclass.connection != base_class.connection
      break
    end
    base_class = base_class.superclass
  end
  @table_mappings ||= {}
  @table_mappings[base_class] ||= begin
    start_hash = base_class.descendants.reject do |_model|
      _model.abstract_class || (_model.connection != model.connection)
    end.group_by(&:table_name).transform_values do |models|
      next models.first if models.size == 1

      root_models = models.map do |_model|
        if _model.to_s.demodulize.starts_with?("HABTM_")
          next
        end
        loop do
          break if !_model.superclass.respond_to?(:abstract_class?) || _model.superclass.table_name.nil?

          _model = _model.superclass
        end
        _model
      end.compact.uniq
      if root_models.size > 1
        raise "More than one root model for table #{models.first.table_name}: #{root_models.inspect}"
      end
      root_models.first
    end
    all_tables = ForeignKeyChecker::Utils.get_tables(model)
    #group_tables(all_tables)
    all_tables.each_with_object(start_hash) do |table, object|
      object[table] ||= table.tr('.', '_').singularize.camelize
    end
  end
end

.column_name_candidates(connection, polymorphic_suffixes: ['_type'], on_error: proc {}) ⇒ Object 



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# File 'lib/foreign_key_checker/utils/belongs_to.rb', line 335

def self.column_name_candidates(connection, polymorphic_suffixes: ['_type'], on_error: proc {})
  columns_of_table = ForeignKeyChecker::Utils.get_columns(connection)
  columns_of_table.each_with_object({}) do |(table, columns), object|
    object[table] = TableLevel.new(connection, table, columns_of_table, polymorphic_suffixes, on_error: on_error, fks: fks).candidates
  end
end

.cycles_for(model) ⇒ Object

ForeignKeyChecker::Utils::BelongsTo.ways_for(User)



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# File 'lib/foreign_key_checker/utils/belongs_to.rb', line 542

def self.cycles_for(model)
  find_cycles(build_hm_tree(model), [model.table_name])
end

.find_cycles(tree, start) ⇒ Object 



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# File 'lib/foreign_key_checker/utils/belongs_to.rb', line 528

def self.find_cycles(tree, start)
  find_ways(tree, start).each_with_object([]) do |way, obj|
    way[0..-2].index(way.last).try do |idx|
      obj.push ([WayPoint.new(nil, way[idx].table)] + way[idx+1..-1])
    end
  end.uniq(&:inspect)
end

.find_ways(node, way) ⇒ Object 



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# File 'lib/foreign_key_checker/utils/belongs_to.rb', line 511

def self.find_ways(node, way)
  way = way.map { |wp| next WayPoint.new(nil, wp) if wp.is_a?(String); wp}
  return [way] if node.nil?
  node.each_with_object([]) do |(key, item), obj|
    tails = if way.include?(key)
      [way + [key]]
    else
      find_ways(item[:children], way + [key])
    end
    item[:associations].each do |ass|
      tails.each do |tail|
        obj.push((tail[0...way.size]) + [WayPoint.new(ass.foreign_key, ass.dependant_table)] + (tail[(way.size + 1)..-1] || []))
      end
    end
  end
end

.fk_candidates(connection, polymorphic_suffixes: ['_type'], on_error: proc {}) ⇒ Object 



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# File 'lib/foreign_key_checker/utils/belongs_to.rb', line 374

def self.fk_candidates(connection, polymorphic_suffixes: ['_type'], on_error: proc {})
  fks.to_a.each_with_object({}) do |datum, obj|
    obj[datum.from_table] ||= []
    obj[datum.from_table].push(Result.new(polymorphic: false, foreign_key: datum.from_column, dependant_table: datum.from_table, primary_table: datum.to_table, connection: connection))
  end
end

.fks ⇒ Object 



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# File 'lib/foreign_key_checker/utils/belongs_to.rb', line 370

def self.fks
  @fks ||= ForeignKeyChecker::Utils.get_foreign_keys
end

.group_tables(tables, level: 1) ⇒ Object 



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# File 'lib/foreign_key_checker/utils/belongs_to.rb', line 325

def self.group_tables(tables, level: 1)
  if tables.size < 2
    return tables
  end
  tables.group_by do |table|
    table.split(/[\._]/).first(level).join('_')
  end.transform_values do |children|
    group_tables(children, level: level + 1)
  end
end

.inverse(hash) ⇒ Object 



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# File 'lib/foreign_key_checker/utils/belongs_to.rb', line 357

def self.inverse(hash)
  hash.each_with_object({}) do |(table, bt_associations), object|
    bt_associations.each do |association|
      object[association.primary_table] ||= []
      object[association.primary_table].push(association.inversed_association(table))
    end
  end.transform_values do |associations|
    associations.uniq do |result|
      "#{result.polymorphic} #{result.foreign_key} #{result.primary_table} #{result.dependant_table} #{result.name} #{result.types&.join(',')}"
    end
  end
end

.merge_candidates(*hashes) ⇒ Object 



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# File 'lib/foreign_key_checker/utils/belongs_to.rb', line 381

def self.merge_candidates(*hashes)
  hashes.each_with_object({}) do |hash, object|
    hash.each do |table, candidates|
      object[table] ||= []
      object[table] = (object[table] + candidates).uniq do |result|
        "#{result.polymorphic} #{result.foreign_key} #{result.primary_table} #{result.dependant_table} #{result.name} #{result.types&.join(',')}"
      end
    end
  end
end

.ways_for(model) ⇒ Object

ForeignKeyChecker::Utils::BelongsTo.ways_for(User)



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# File 'lib/foreign_key_checker/utils/belongs_to.rb', line 537

def self.ways_for(model)
  find_ways(build_hm_tree(model), [model.table_name])
end