Class: ActiveRecord::Associations::Preloader::Association

Inherits:
Object
  • Object
show all
Defined in:
lib/composite_primary_keys/associations/preloader/association.rb

Instance Method Summary collapse

Instance Method Details

#associated_records_by_owner(preloader) ⇒ Object 



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# File 'lib/composite_primary_keys/associations/preloader/association.rb', line 17

def associated_records_by_owner(preloader)
  owners_map = owners_by_key
  # CPK
  # owner_keys = owners_map.keys.compact
  owner_keys = if reflection.foreign_key.is_a?(Array)
    owners.map do |owner|
      Array(owner_key_name).map do |owner_key|
        owner[owner_key]
      end
    end.compact.uniq
  else
    owners_map.keys.compact
  end

  # Each record may have multiple owners, and vice-versa
  records_by_owner = owners.each_with_object({}) do |owner,h|
    h[owner] = []
  end

  if owner_keys.any?
    # Some databases impose a limit on the number of ids in a list (in Oracle it's 1000)
    # Make several smaller queries if necessary or make one query if the adapter supports it
    sliced  = owner_keys.each_slice(klass.connection.in_clause_length || owner_keys.size)

    records = load_slices sliced
    records.each do |record, owner_key|
      owners_map[owner_key].each do |owner|
        records_by_owner[owner] << record
      end
    end
  end

  records_by_owner
end

#load_slices(slices) ⇒ Object 



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# File 'lib/composite_primary_keys/associations/preloader/association.rb', line 52

def load_slices(slices)
  @preloaded_records = slices.flat_map { |slice|
    records_for(slice)
  }

  # CPK
  # @preloaded_records.map { |record|
  #   key = record[association_key_name]
  #   key = key.to_s if key_conversion_required?
  #
  #   [record, key]
  # }
  @preloaded_records.map { |record|
    key = Array(association_key_name).map do |key_name|
      record[key_name]
    end.join(CompositePrimaryKeys::ID_SEP)

    [record, key]
  }
end

#owners_by_key ⇒ Object 



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# File 'lib/composite_primary_keys/associations/preloader/association.rb', line 73

def owners_by_key
  unless defined?(@owners_by_key)
    @owners_by_key = owners.each_with_object({}) do |owner, h|
      # CPK
      #key = convert_key(owner[owner_key_name])
      key = if owner_key_name.is_a?(Array)
              Array(owner_key_name).map do |key_name|
                convert_key(owner[key_name])
              end
            else
              convert_key(owner[owner_key_name])
            end

      h[key] = owner if key
    end
  end
  @owners_by_key
end

#records_for(ids, &block) ⇒ Object 



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# File 'lib/composite_primary_keys/associations/preloader/association.rb', line 5

def records_for(ids, &block)
  # CPK
  #scope.where(association_key_name => ids).load(&block)

  if association_key_name.is_a?(Array)
    predicate = cpk_in_predicate(klass.arel_table, association_key_name, ids)
    scope.where(predicate).load(&block)
  else
    scope.where(association_key_name => ids).load(&block)
  end
end

#run(preloader) ⇒ Object 



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# File 'lib/composite_primary_keys/associations/preloader/association.rb', line 92

def run(preloader)
  records = load_records do |record|
    # CPK
    #owner = owners_by_key[convert_key(record[association_key_name])]

    key = if association_key_name.is_a?(Array)
            Array(record[association_key_name]).map do |key|
              convert_key(key)
            end
          else
            record[association_key_name]
          end

    owner = owners_by_key[key]
    association = owner.association(reflection.name)
    association.set_inverse_instance(record)
  end

  owners.each do |owner|
    associate_records_to_owner(owner, records[convert_key(owner[owner_key_name])] || [])
  end
end