Module: InheritedResources::UrlHelpers

Defined in:
lib/vendor/plugins/inherited_resources/lib/inherited_resources/url_helpers.rb

Overview

URLHelpers

When you use InheritedResources it creates some UrlHelpers for you. And they handle everything for you.

# /posts/1/comments
resource_url          # => /posts/1/comments/#{@comment.to_param}
resource_url(comment) # => /posts/1/comments/#{comment.to_param}
new_resource_url      # => /posts/1/comments/new
edit_resource_url     # => /posts/1/comments/#{@comment.to_param}/edit
collection_url        # => /posts/1/comments
parent_url            # => /posts/1

# /projects/1/tasks
resource_url          # => /projects/1/tasks/#{@task.to_param}
resource_url(task)    # => /projects/1/tasks/#{task.to_param}
new_resource_url      # => /projects/1/tasks/new
edit_resource_url     # => /projects/1/tasks/#{@task.to_param}/edit
collection_url        # => /projects/1/tasks
parent_url            # => /projects/1

# /users
resource_url          # => /users/#{@user.to_param}
resource_url(user)    # => /users/#{user.to_param}
new_resource_url      # => /users/new
edit_resource_url     # => /users/#{@user.to_param}/edit
collection_url        # => /users
parent_url            # => /

The nice thing is that those urls are not guessed during runtime. They are all created when you inherit.

Instance Method Summary collapse

Instance Method Details

#create_resources_url_helpers! ⇒ Object

This method hard code url helpers in the class.

We are doing this because is cheaper than guessing them when our action is being processed (and even more cheaper when we are using nested resources).

When we are using polymorphic associations, those helpers rely on polymorphic_url Rails helper.



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# File 'lib/vendor/plugins/inherited_resources/lib/inherited_resources/url_helpers.rb', line 45

def create_resources_url_helpers!
  resource_segments, resource_ivars = [], []
  resource_config = self.resources_configuration[:self]

  singleton   = self.resources_configuration[:self][:singleton]
  polymorphic = self.parents_symbols.include?(:polymorphic)

  # Add route_prefix if any.
  unless resource_config[:route_prefix].blank?
    if polymorphic
      resource_ivars << resource_config[:route_prefix].to_s.inspect
    else
      resource_segments << resource_config[:route_prefix]
    end
  end

  # Deal with belongs_to associations and polymorphic associations.
  # Remember that we don't have to build the segments in polymorphic cases,
  # because the url will be polymorphic_url.
  #
  self.parents_symbols.each do |symbol|
    if symbol == :polymorphic
      resource_ivars << :parent
    else
      config = self.resources_configuration[symbol]
      resource_segments << config[:route_name]
      resource_ivars    << :"@#{config[:instance_name]}"
    end
  end

  collection_ivars    = resource_ivars.dup
  collection_segments = resource_segments.dup

  # Generate parent url before we add resource instances.
  generate_url_and_path_helpers nil, :parent, resource_segments, resource_ivars

  # This is the default route configuration, later we have to deal with
  # exception from polymorphic and singleton cases.
  #
  collection_segments << resource_config[:route_collection_name]
  resource_segments   << resource_config[:route_instance_name]
  resource_ivars      << :"@#{resource_config[:instance_name]}"

  # In singleton cases, we do not send the current element instance variable
  # because the id is not in the URL. For example, we should call:
  #
  #   project_manager_url(@project)
  #
  # Instead of:
  #
  #   project_manager_url(@project, @manager)
  #
  # Another exception in singleton cases is that collection url does not
  # exist. In such cases, we create the parent collection url. So in the
  # manager case above, the collection url will be:
  #
  #    project_url(@project)
  #
  # If the singleton does not have a parent, it will default to root_url.
  #
  # Finally, polymorphic cases we have to give hints to the polymorphic url
  # builder. This works by attaching new ivars as symbols or records.
  #
  if singleton
    collection_segments.pop
    resource_ivars.pop

    if polymorphic
      resource_ivars << resource_config[:instance_name].inspect
      new_ivars       = resource_ivars
    end
  elsif polymorphic
    collection_ivars << '(@_resource_class_new ||= resource_class.new)'
  end

  generate_url_and_path_helpers nil,   :collection, collection_segments, collection_ivars
  generate_url_and_path_helpers :new,  :resource,   resource_segments,   new_ivars || collection_ivars
  generate_url_and_path_helpers nil,   :resource,   resource_segments,   resource_ivars
  generate_url_and_path_helpers :edit, :resource,   resource_segments,   resource_ivars
end

#generate_url_and_path_helpers(prefix, name, resource_segments, resource_ivars) ⇒ Object

:nodoc:



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# File 'lib/vendor/plugins/inherited_resources/lib/inherited_resources/url_helpers.rb', line 126

def generate_url_and_path_helpers(prefix, name, resource_segments, resource_ivars) #:nodoc:
  ivars = resource_ivars.dup

  singleton   = self.resources_configuration[:self][:singleton]
  polymorphic = self.parents_symbols.include?(:polymorphic)

  # If it's not a singleton, ivars are not empty, not a collection or
  # not a "new" named route, we can pass a resource as argument.
  #
  unless (singleton && name != :parent) || ivars.empty? || name == :collection || prefix == :new
    ivars.push "(given_args.first || #{ivars.pop})"
  end

  # In collection in polymorphic cases, allow an argument to be given as a
  # replacemente for the parent.
  #
  if name == :collection && polymorphic
    index = ivars.index(:parent)
    ivars.insert index, "(given_args.first || parent)"
    ivars.delete(:parent)
  end

  # When polymorphic is true, the segments must be replace by :polymorphic
  # and ivars should be gathered into an array, which is compacted when
  # optional.
  #
  if polymorphic
    segments = :polymorphic
    ivars    = "[#{ivars.join(', ')}]"
    ivars   << '.compact' if self.resources_configuration[:polymorphic][:optional]
  else
    segments = resource_segments.empty? ? 'root' : resource_segments.join('_')
    ivars    = ivars.join(', ')
  end

  prefix = prefix ? "#{prefix}_" : ''
  ivars << (ivars.empty? ? 'given_options' : ', given_options')

  class_eval <<-URL_HELPERS, __FILE__, __LINE__
    protected
      def #{prefix}#{name}_path(*given_args)
        given_options = given_args.extract_options!
        #{prefix}#{segments}_path(#{ivars})
      end

      def #{prefix}#{name}_url(*given_args)
        given_options = given_args.extract_options!
        #{prefix}#{segments}_url(#{ivars})
      end
  URL_HELPERS
end