Stage for Merb¶

Merb Instructions¶

Installing¶

sudo gem install stage

Demonstration of usage¶

$ merb-gen stage page title:string content:text
exists  app
exists  app/controllers
exists  app/helpers
exists  app/models
exists  app/views
create  app/views/pages
create  app/controllers/pages.rb
create  app/helpers/pages_helper.rb
create  app/models/page.rb
create  app/views/pages/_data.html.erb
create  app/views/pages/_form.html.erb
create  app/views/pages/edit.html.erb
create  app/views/pages/index.html.erb
create  app/views/pages/new.html.erb
create  app/views/pages/show.html.erb

The controller generated:

  class Pages < Application
    before :find_page, :only => [:show, :edit, :update, :delete]

    def index
      @pages = Page.all
      display @pages
    end

    def show
      display @page
    end

    def new
      only_provides :html
      @page = Page.new
      render
    end

    def edit
      only_provides :html
      render
    end

    def create
      @page = Page.new(params[:page])
      if @page.save
        redirect url(:page, @page)
      else
        render :new
      end
    end

    def update
      if @page.update_attributes(params[:page])
        redirect url(:page, @page)
      else
        raise BadRequest
      end
    end

    def delete
      if @page.destroy!
        redirect url(:page)
      else
        raise BadRequest
      end
    end

    private
    def find_page
      @page = Page.first(params[:id])
      raise NotFound unless @page
    end
  end

The edit page:

  <h1>Editing page</h1>

  <%= partial "form" %>

  <%= link_to 'Show', url(:page, @page) %> |
  <%= link_to 'Back', url(:pages) %>

The form partial:

  <%
    submit_label = "Update" 
    submit_label = "Create" if @page.new_record?
  -%>

  <%= error_messages_for @page %>

  <% form_for(:page, :action => url(:page,@page)) do %>
    <%= partial :data %>
    <p> <%= submit_button submit_label %> </p>
  <% end %>

The data partial (the show view calls this directly):

  <p>
    <b>Title</b><br />
    <%= page_title_value %>
  </p>

  <p>
    <b>Content</b><br />
    <%= page_content_value %>
  </p>

As you can see, there are <model>_<field>_value methods. These are defined in the pages helper:

  module Merb
    module PagesHelper
      def page_title_value
        if @action_name == "show" 
          @page.title
        else
          text_field :name => "page[title]", :value => @page.title
        end
      end

      def page_content_value
        if @action_name == "show" 
          @page.content
        else
          text_field :name => "page[content]", :value => @page.content
        end
      end
    end
  end

I need to get more precise with the form helpers, but for now this will do.