# = 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 # # # /projects/1/tasks # resource_url # => /products/1/tasks/#{@task.to_param} # resource_url(task) # => /products/1/tasks/#{task.to_param} # new_resource_url # => /products/1/tasks/new # edit_resource_url # => /products/1/tasks/#{@task.to_param}/edit # collection_url # => /products/1/tasks # # # /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 # # The nice thing is that those urls are not guessed during runtime. They are # all created when you inherit. # module InheritedResources #:nodoc: module UrlHelpers #:nodoc: # 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. # def self.create_resources_url_helpers!(base) resource_segments, resource_ivars = [], [] resource_config = base.resources_configuration[:self] polymorphic = false # Add route_prefix if any. resource_segments << resource_config[:route_prefix] if resource_config[:route_prefix] # 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. # base.parents_symbols.map do |symbol| if symbol == :polymorphic polymorphic = true resource_ivars << :parent else config = base.resources_configuration[symbol] resource_segments << config[:route_name] resource_ivars << config[:instance_name] end end # Deals with singleton. # # If not a singleton, we add the current collection name and build the # collection url. It can build for example: # # project_tasks_url # # If it's a singleton we also build a collection, just for compatibility. # The collection_url for singleton is the parent show url. For example, # if we have ProjectsController with ManagerController, where the second # is the singleton, the collection url would be: project_url(@project). # # This is where you are going to be redirected after destroying the manager. # unless base.singleton resource_segments << resource_config[:collection_name] generate_url_and_path_helpers(base, nil, :collection, resource_segments, resource_ivars, polymorphic) resource_segments.pop else generate_url_and_path_helpers(base, nil, :collection, resource_segments, resource_ivars, polymorphic) end # Prepare and add new_resource_url resource_segments << resource_config[:instance_name] generate_url_and_path_helpers(base, :new, :resource, resource_segments, resource_ivars, polymorphic) # We don't add the resource_ivar to edit and show url if singleton. # Singletons are simply: # # edit_project_manager_url(@project) # # Instead of: # # edit_project_task_url(@project, @task) # resource_ivars << resource_config[:instance_name] unless base.singleton # Prepare and add resource_url and edit_resource_url generate_url_and_path_helpers(base, nil, :resource, resource_segments, resource_ivars, polymorphic) generate_url_and_path_helpers(base, :edit, :resource, resource_segments, resource_ivars, polymorphic) end def self.generate_url_and_path_helpers(base, prefix, name, resource_segments, resource_ivars, polymorphic=false) ivars = resource_ivars.map{|i| i == :parent ? :parent : "@#{i}" } # 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 base.singleton || ivars.empty? || name == :collection || prefix == :new ivars.push "(given_args.first || #{ivars.pop})" end # When polymorphic is true, the segments must be replace by :polymorphic # and ivars should be gathered into an array. # if polymorphic segments = :polymorphic # Customization to allow polymorphic with singletons. # # Let's take the projects and companies where each one has one manager # example. The url helpers would be: # # company_manager_url(@company) # project_manager_url(@project) # # Notice how the manager is not sent in the helper, because it's a # singleton. So, polymorphic urls would be: # # polymorphic_url(@company) # polymorphic_url(@project) # # Obviously, this won't work properly. So in such cases, polymorphic # with singlestons we have to send this: # # polymorphic_url(@company, 'manager') # polymorphic_url(@project, 'manager') # # This is exactly what we are doing here. # # The other case to be handle, is collection and new helpers with # polymorphic urls. # # In such cases, we usually would not send anything: # # project_tasks_url(@project) # new_project_task_url(@project) # # But this wouldn't work with polymorphic urls by the same reason as # singletons: # # polymorphic_url(@project) # new_polymorphic_url(@project) # # So we have to do this: # # polymorphic_url(@project, Task.new) # new_polymorphic_url(@project, Task.new) # if base.singleton ivars << base.resources_configuration[:self][:instance_name].inspect unless name == :collection elsif name == :collection || prefix == :new ivars << 'resource_class.new' end ivars = "[#{ivars.join(', ')}]" # Add compact to deal with polymorphic optional associations. ivars << '.compact' if base.resources_configuration[:polymorphic][:optional] else # In the last case, if segments is empty (this usually happens with # root singleton resources, we set it to root) # segments = resource_segments.empty? ? 'root' : resource_segments.join('_') ivars = ivars.join(', ') end prefix = prefix ? "#{prefix}_" : '' # Add given_options to ivars ivars << (ivars.empty? ? 'given_options' : ', given_options') base.class_eval <