Module: IAmICan::DynamicGenerate

Extended by:
DynamicGenerate
Included in:
DynamicGenerate
Defined in:
lib/i_am_i_can/dynamic_generate.rb

Instance Method Summary collapse

Instance Method Details

#assignment_helpers ⇒ Object 



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# File 'lib/i_am_i_can/dynamic_generate.rb', line 45

def assignment_helpers
  # Generate 4 methods for each Content of Assignment
  #
  # Example for a subject model called User, which `has_and_belongs_to_many :stored_roles`.
  # You call this proc by given contents [:role], then:
  #
  # 1. stored_roles_add
  #   Add roles to a user instance
  #
  # 2. stored_roles_add
  #   Remove roles to a user instance
  #
  # 3. stored_role_names
  #   Get names of stored_roles of a user instance
  #
  # 4. self.stored_role_names
  #   Get names of stored_roles of User ActiveRecord::Relation
  #
  proc do |contents|
    contents.each do |content|
      # TODO: refactoring
      define_method "#{_reflect_of(content)}_add" do |locate_vals = nil, check_size: nil, **condition|
        condition = { name: locate_vals } if locate_vals
        assoc = send("_#{content.to_s.pluralize}")
        records = i_am_i_can.send("#{content}_model").where(condition).where.not(id: assoc.ids)
        # will return false if it does nothing
        return false if records.blank? || (check_size && records.count != check_size)
        assoc << records
      end

      define_method "#{_reflect_of(content)}_rmv" do |locate_vals = nil, check_size: nil, **condition|
        condition = { name: locate_vals } if locate_vals
        assoc = send("_#{content.to_s.pluralize}")
        records = i_am_i_can.send("#{content}_model").where(id: assoc.ids, **condition)
        # will return false if it does nothing
        return false if records.blank? || (check_size && records.count != check_size)
        assoc.destroy(records)
      end

      define_method "#{_reflect_of(content).to_s.singularize}_names" do
        send("_#{content.to_s.pluralize}").map(&:name).map(&:to_sym)
      end

      define_singleton_method "#{_reflect_of(content).to_s.singularize}_names" do
        all.flat_map { |user| user.send("#{_reflect_of(content).to_s.singularize}_name") }.uniq
      end
    end
  end
end

#class_reflections ⇒ Object 



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# File 'lib/i_am_i_can/dynamic_generate.rb', line 17

def class_reflections
  # Extend each associated querying to a class method that returns ActiveRecord::Relation
  #
  # Suppose: in UserRole model,
  #   has_and_belongs_to_many :related_users
  #
  # It will do like this:
  #   def self.related_users
  #     i_am_i_can.subject_model.with_stored_roles.where(user_roles: { id: self.ids })
  #   end
  #
  # Usage:
  #   UserRole.all.related_users
  #
  proc do
    %w[ subject role role_group permission ].each do |k|
      next unless _reflect_of(k)
      define_singleton_method _reflect_of(k) do
        model = i_am_i_can.send("#{k}_model")
        raise NoMethodError unless (reflect_name = model._reflect_of(i_am_i_can.act))
        model.send("with_#{reflect_name}").where(
            self.name.underscore.pluralize => { id: self.ids }
        )
      end
    end
  end
end

#scopes ⇒ Object 



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# File 'lib/i_am_i_can/dynamic_generate.rb', line 5

def scopes
  # Generate scopes of each specified i_am_i_can association
  #
  # scope :with_stored_roles, -> { includes(:stored_roles) }
  #
  proc do |keys|
    keys.each do |k|
      scope :"with_#{_reflect_of(k)}", ->  { includes(_reflect_of(k)) }
    end
  end
end