Module: ContentfulModel::Associations::HasMany::ClassMethods

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

Instance Method Summary collapse

Instance Method Details

#has_many(association_names, options = {}) ⇒ Object

has_many is called on the parent model

e.g class Foo

has_many :bars, class_name: "Something"

end The only reason for this method is that we might want to specify a relationship which is different from the name of the model we’re calling. If you specify a class_name, the method called on the parent will be that. e.g. .somethings in this example

Parameters:

  • association_names (Symbol) —

    the name of the child model, as a plural symbol



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# File 'lib/contentful_model/associations/has_many.rb', line 19

def has_many(association_names, options = {})
  default_options = {
    class_name: association_names.to_s.singularize.classify,
    inverse_of: self.to_s.underscore.to_s
  }
  options = default_options.merge(options)
  define_method association_names do
    begin
      # Start by calling the association name as a method on the superclass.
      # this will end up in ContentfulModel::Base#method_missing and return the value from Contentful.
      # We set the singular of the association name on each object in the collection to allow easy
      # reverse recursion without another API call (i.e. finding the Foo which called .bars())
      super().collect do |child|
        child.send(:"#{options[:inverse_of]}=",self)
      end
    rescue ContentfulModel::AttributeNotFoundError
      # If AttributeNotFoundError is raised, that means that the association name isn't available on the object.
      # We try to call the class name (pluralize) instead, or give up and return an empty collection
      if options[:class_name].pluralize.underscore.to_sym != association_names
        self.send(options[:class_name].pluralize.underscore.to_sym)
      else
        #return an empty collection if the class name was the same as the association name and there's no attribute on the object.
        []
      end
    end
  end
end