Module: ContentfulModel::Associations::BelongsToMany::ClassMethods

Defined in:
lib/contentful_model/associations/belongs_to_many.rb

Instance Method Summary collapse

Instance Method Details

#belongs_to_many(association_names, opts = {}) ⇒ Object

Parameters:

  • association_names (Symbol) —

    plural name of the class we need to search through, to find this class

  • options (true, Hash) —

    options



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# File 'lib/contentful_model/associations/belongs_to_many.rb', line 22

def belongs_to_many(association_names, opts = {})
  default_options = {
    class_name: association_names.to_s.singularize.classify,
    inverse_of: self.to_s.underscore.to_sym
  }
  options = default_options.merge(opts)
  # Set up the association name for the instance which loaded this object
  # This is useful in situations where, primarily, it's a 1:* relationship (i.e. belongs_to)
  # even though this isn't actually supported by Contentful
  #
  # f = Foo.first
  # b = f.bars.first
  # b.foo #would return the instance of Foo which loaded it

  define_method association_names.to_s.singularize do
    instance_variable_get(:"@#{association_names.to_s.singularize}")
  end

  define_method "#{association_names.to_s.singularize}=" do |parent|
    instance_variable_set(:"@#{association_names.to_s.singularize}",parent)
    return self
  end

  # Set up the association name (plural)
  if self.respond_to?(association_names)
    self.send(association_names)
  else
    define_method "#{association_names}" do
      parents = instance_variable_get(:"@#{association_names}")
      if parents.nil?
        #get the parent class objects as an array
        parent_objects = options[:class_name].constantize.send(:all).send(:load)
        #iterate through parent objects and see if any of the children include the same ID as the method
        parents = parent_objects.select do |parent_object|
          #check to see if the parent object responds to the plural or singular.
          if parent_object.respond_to?(:"#{options[:inverse_of].to_s.pluralize}")
            collection_of_children_on_parent = parent_object.send(:"#{options[:inverse_of].to_s.pluralize}")
            #get the collection of children from the parent. This *might* be nil if the parent doesn't have
            # any children, in which case, just skip over this parent item and move on to the next.
            if collection_of_children_on_parent.nil?
              next
            else
              collection_of_children_on_parent.collect(&:id).include?(id)
            end
          else
            #if it doesn't respond to the plural, assume singular
            child_on_parent = parent_object.send(:"#{options[:inverse_of]}")
            # Do the same skipping routine on nil.
            if child_on_parent.nil?
              next
            else
              child_on_parent.send(:id) == id
            end

          end
        end
        instance_variable_set(:"@#{association_names}",parents)
      end
      parents
    end
  end
end