Module: PassiveRecord::Associations

Included in:
ClassMethods
Defined in:
lib/passive_record/associations.rb,
lib/passive_record/associations/has_one.rb,
lib/passive_record/associations/has_many.rb,
lib/passive_record/associations/belongs_to.rb,
lib/passive_record/associations/has_many_through.rb

Defined Under Namespace

Classes: BelongsToAssociation, BelongsToRelation, HasManyAssociation, HasManyRelation, HasManyThroughAssociation, HasManyThroughRelation, HasOneAssociation, HasOneRelation, Relation

Instance Method Summary collapse

Instance Method Details

#associate!(assn) ⇒ Object 



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# File 'lib/passive_record/associations.rb', line 8

def associate!(assn)
  @associations ||= []
  @associations += [assn] unless @associations.include?(assn)
  self
end

#associations_id_syms ⇒ Object 



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# File 'lib/passive_record/associations.rb', line 14

def associations_id_syms
  @associations && @associations.map do |assn|
    if assn.is_a?(HasOneAssociation) || assn.is_a?(BelongsToAssociation)
      (assn.target_name_symbol.to_s + "_id").to_sym
    else
      (assn.target_name_symbol.to_s.singularize + "_ids").to_sym
    end
  end || []
end

#belongs_to(parent_name_sym, opts = {}) ⇒ Object 



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# File 'lib/passive_record/associations.rb', line 24

def belongs_to(parent_name_sym, opts={})
  target_class_name = opts.delete(:class_name) { (parent_name_sym.to_s).split('_').map(&:capitalize).join }
  association = BelongsToAssociation.new(self, target_class_name, parent_name_sym)
  associate!(association)

  define_method(:"#{parent_name_sym}_id") do
    prnt = send(parent_name_sym)
    prnt && prnt.id
  end

  define_method(parent_name_sym) do
    relation = detect_relation(association)
    association.parent_class.find(relation.parent_model_id)
  end

  define_method(:"#{parent_name_sym}=") do |new_parent|
    send(:"#{parent_name_sym}_id=", new_parent.id)
  end

  define_method(:"#{parent_name_sym}_id=") do |new_parent_id|
    relation = detect_relation(association)
    relation.parent_model_id = new_parent_id
  end
end

#has_and_belongs_to_many(collection_name_sym) ⇒ Object 



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# File 'lib/passive_record/associations.rb', line 173

def has_and_belongs_to_many(collection_name_sym)
  habtm_join_class_name =
    self.name.split('::').last.singularize +
    collection_name_sym.to_s.camelize.singularize +
    "JoinModel"
  inverse_habtm_join_class_name =
    collection_name_sym.to_s.camelize.singularize +
    self.name.split('::').last.singularize +
    "JoinModel"

  module_name = self.name.deconstantize
  module_name = "Object" if module_name.empty?
  intended_module = module_name.constantize

  if (intended_module.const_get(inverse_habtm_join_class_name) rescue false)
    has_many inverse_habtm_join_class_name.underscore.to_sym
    has_many collection_name_sym, :through => inverse_habtm_join_class_name.underscore.to_sym, habtm: true
  else
    auto_collection_sym = self.name.split('::').last.underscore.pluralize.to_sym
    eval <<-ruby
    class #{module_name}::#{habtm_join_class_name}          # class System::UserRoleJoinModel
      include PassiveRecord                                 #   include PassiveRecord
      belongs_to :#{collection_name_sym.to_s.singularize}   #   belongs_to :role
      belongs_to :#{auto_collection_sym.to_s.singularize}   #   belongs_to :user
    end                                                     # end
    ruby
    has_many habtm_join_class_name.underscore.to_sym
    has_many(collection_name_sym, :through => habtm_join_class_name.underscore.to_sym, habtm: true)
  end
end

#has_many(collection_name_sym, opts = {}) ⇒ Object 



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# File 'lib/passive_record/associations.rb', line 84

def has_many(collection_name_sym, opts={})
  target_class_name = opts.delete(:class_name) { (collection_name_sym.to_s).split('_').map(&:capitalize).join.singularize }
  habtm = opts.delete(:habtm) { false }

  association = nil
  if opts.key?(:through)
    through_class_collection_name = opts.delete(:through)

    through_class_name = (through_class_collection_name.to_s).split('_').map(&:capitalize).join.singularize
    base_association = associations.detect { |assn| assn.child_class_name == through_class_name rescue false }

    association = HasManyThroughAssociation.new(
      self, target_class_name, collection_name_sym, through_class_collection_name, base_association, habtm)

    associate!(association)

    define_method(:"#{collection_name_sym}=") do |new_collection|
      send(:"#{collection_name_sym.to_s.singularize}_ids=", new_collection.map(&:id))
    end

    define_method(:"#{collection_name_sym.to_s.singularize}_ids=") do |new_collection_ids|
      relation = detect_relation(association) # relata.detect { |rel| rel.association == association }

      intermediary = relation.intermediary_relation

      # drop all intermediary relations
      intermediary.where( relation.parent_model_id_field => relation.id ).each do |intermediate|
        intermediate.destroy
      end

      # add in new ones...
      singular_target = collection_name_sym.to_s.singularize
      if !(relation.nested_association.is_a?(BelongsToAssociation))
        intermediary.create(
          singular_target + "_ids" => new_collection_ids,
          relation.parent_model_id_field => relation.id
        )
      else
        new_collection_ids.each do |child_id|
          intermediary.create(
            singular_target + "_id" => child_id,
            relation.parent_model_id_field => relation.id
          )
        end
      end
    end
  else
    association = HasManyAssociation.new(self, target_class_name, collection_name_sym)
    associate!(association)

    define_method(:"#{collection_name_sym}=") do |new_collection|
      relation = detect_relation(association)

      # detach existing children...
      relation.all.each do |child|
        child.send(:"#{relation.parent_model_id_field}=", nil)
      end

      # reattach new children
      new_collection.each do |child|
        child.send(:"#{relation.parent_model_id_field}=", relation.id)
      end
    end

    define_method(:"#{collection_name_sym.to_s.singularize}_ids=") do |new_collection_ids|
      relation = detect_relation(association) #@ relata.detect { |rel| rel.association == association }
      send(:"#{collection_name_sym}=", relation.child_class.find(new_collection_ids))
    end
  end

  define_method(collection_name_sym) do
    detect_relation(association)
    # relata.detect { |rel| rel.association == association }
  end

  define_method(:"#{collection_name_sym.to_s.singularize}_ids") do
    begin
      send(collection_name_sym).map(&:id)
    rescue
      binding.pry
    end
  end

  define_method(:"create_#{collection_name_sym.to_s.singularize}") do |attrs={}|
    relation = detect_relation(association) # relata.detect { |rel| rel.association == association }
    relation.create(attrs)
  end
end

#has_one(child_name_sym) ⇒ Object 



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# File 'lib/passive_record/associations.rb', line 49

def has_one(child_name_sym)
  child_class_name = (child_name_sym.to_s).split('_').map(&:capitalize).join
  association = HasOneAssociation.new(self, child_class_name, child_name_sym)
  associate!(association)

  define_method(:"#{child_name_sym}_id") do
    chld = send(child_name_sym)
    chld && chld.id
  end

  define_method(child_name_sym) do
    relation = detect_relation(association)
    relation.lookup
  end

  define_method(:"create_#{child_name_sym}") do |attrs={}|
    relation = detect_relation(association)
    relation.create(attrs)
  end

  define_method(:"#{child_name_sym}=") do |new_child|
    send(:"#{child_name_sym}_id=", new_child.id)
  end

  define_method(:"#{child_name_sym}_id=") do |new_child_id|
    relation = detect_relation(association) #relata.detect { |rel| rel.association == association }
    rel = relation.lookup
    rel && rel.send(:"#{relation.parent_model_id_field}=", nil)

    relation.child_class.
      find(new_child_id).
      update(relation.parent_model_id_field => relation.id)
  end
end