Module: ActiveRecord::JsonAssociations

Defined in:
lib/active_record/json_associations.rb,
lib/active_record/json_associations/version.rb

Constant Summary collapse

VERSION = 
"0.6.8"

Instance Method Summary collapse

Instance Method Details

#belongs_to_many(many, class_name: nil) ⇒ Object 



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# File 'lib/active_record/json_associations.rb', line 6

def belongs_to_many(many, class_name: nil)
  one = many.to_s.singularize
  one_ids = :"#{one}_ids"
  one_ids_equals = :"#{one_ids}="
  many_equals = :"#{many}="
  many_eh = :"#{many}?"

  class_name ||= one.classify

  serialize one_ids, JSON

  include Module.new {
    define_method one_ids do
      super() || []
    end

    define_method one_ids_equals do |ids|
      super Array(ids).select(&:present?).map(&:to_i)
    end

    define_method many do
      klass = class_name.constantize
      scope = klass.all

      ids = send(one_ids)
      scope.where!(klass.primary_key => ids)

      fragments = []
      fragments += ["#{klass.primary_key} NOT IN (#{ids.map(&:to_s).join(",")})"] if ids.any?
      fragments += ids.reverse.map { |id| "#{klass.primary_key}=#{id}" }
      order_by_ids = fragments.join(", ")
      scope.order!(order_by_ids)
    end

    define_method many_equals do |collection|
      send one_ids_equals, collection.map(&:id)
    end

    define_method many_eh do
      send(one_ids).any?
    end
  }
end

#has_many(many, scope = nil, options = {}, &extension) ⇒ Object 



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# File 'lib/active_record/json_associations.rb', line 50

def has_many many, scope = nil, options = {}, &extension
  unless (scope.is_a?(Hash) && scope[:json_foreign_key]) || (options.is_a?(Hash) && options[:json_foreign_key])
    return super
  end

  if scope.is_a?(Hash)
    options = scope
    scope   = nil
  end

  one = many.to_s.singularize
  one_ids = :"#{one}_ids"
  one_ids_equals = :"#{one_ids}="
  many_equals = :"#{many}="
  many_eh = :"#{many}?"

  class_name = options[:class_name] || one.classify

  foreign_key = options[:json_foreign_key]
  foreign_key = :"#{model_name.singular}_ids" if foreign_key == true

  include Module.new {
    define_method one_ids do
      send(many).pluck(:id)
    end

    define_method one_ids_equals do |ids|
      klass = class_name.constantize
      normalized_ids = Array(ids).select(&:present?).map(&:to_i)
      send many_equals, klass.find(normalized_ids)
    end

    define_method many do
      klass = class_name.constantize
      klass.where("#{foreign_key} LIKE '[#{id}]'").or(
        klass.where("#{foreign_key} LIKE '[#{id},%'")).or(
        klass.where("#{foreign_key} LIKE '%,#{id},%'")).or(
        klass.where("#{foreign_key} LIKE '%,#{id}]'"))
    end

    define_method many_equals do |collection|
      collection.each do |record|
        new_id_array = Array(record.send(foreign_key)) | [id]
        raise "FIXME: Cannot assign during creation, because no id has yet been reified." if new_id_array.any?(&:nil?)
        record.update foreign_key => new_id_array
      end
    end

    define_method many_eh do
      send(many).any?
    end
  }
end