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Denis Savitskiy, 2013-01-28 15:50
Plugin Tutorial¶
This tutorial is based on Redmine 2.x. You can view a previous version of this tutorial for Redmine 1.x here.
It assumes that you're familiar with the Ruby on Rails framework.
- Table of contents
- Plugin Tutorial
Creating a new Plugin¶
You may need to set the RAILS_ENV variable in order to use the command below:
$ export RAILS_ENV="production"
On windows:
$ set RAILS_ENV=production
Creating a new plugin can be done using the Redmine plugin generator.
Syntax for this generator is:
ruby script/rails generate redmine_plugin <plugin_name>
So open up a command prompt and "cd" to your redmine directory, then execute the following command:
$ ruby script/rails generate redmine_plugin Polls create plugins/polls/app create plugins/polls/app/controllers create plugins/polls/app/helpers create plugins/polls/app/models create plugins/polls/app/views create plugins/polls/db/migrate create plugins/polls/lib/tasks create plugins/polls/assets/images create plugins/polls/assets/javascripts create plugins/polls/assets/stylesheets create plugins/polls/config/locales create plugins/polls/test create plugins/polls/README.rdoc create plugins/polls/init.rb create plugins/polls/config/routes.rb create plugins/polls/config/locales/en.yml create plugins/polls/test/test_helper.rb
The plugin structure is created in plugins/polls
. Edit plugins/polls/init.rb
to adjust plugin information (name, author, description and version):
Redmine::Plugin.register :polls do
name 'Polls plugin'
author 'John Smith'
description 'A plugin for managing polls'
version '0.0.1'
end
Then restart the application and point your browser to http://localhost:3000/admin/plugins.
After logging in, you should see your new plugin in the plugins list:
Note: any change to the init.rb
file of your plugin requires to restart the application as it is not reloaded on each request.
Generating a model¶
For now plugin doesn't store anything. Let's create a simple Poll model for our plugin. Syntax is:
ruby script/rails generate redmine_plugin_model <plugin_name> <model_name> [field[:type][:index] field[:type][:index] ...]
So, go to the command prompt and run:
$ ruby script/rails generate redmine_plugin_model polls poll question:string yes:integer no:integer create plugins/polls/app/models/poll.rb create plugins/polls/test/unit/poll_test.rb create plugins/polls/db/migrate/001_create_polls.rb
This creates the Poll model and the corresponding migration file 001_create_polls.rb
in plugins/polls/db/migrate
:
class CreatePolls < ActiveRecord::Migration
def change
create_table :polls do |t|
t.string :question
t.integer :yes, :default => 0
t.integer :no, :default => 0
end
end
end
You can adjust your migration file (eg. default values...) then migrate the database using the following command:
$ rake redmine:migrate_plugins Migrating polls (Polls plugin)... == CreatePolls: migrating ==================================================== -- create_table(:polls) -> 0.0410s == CreatePolls: migrated (0.0420s) ===========================================
Note that each plugin has its own set of migrations.
Lets add some Polls in the console so we have something to work with. The console is where you can interactively work and examine the Redmine environment and is very informative to play around in. But for now we just need create two Poll objects
ruby script/rails console [rails 3] rails console >> Poll.create(:question => "Can you see this poll") >> Poll.create(:question => "And can you see this other poll") >> exit
Edit plugins/polls/app/models/poll.rb
in your plugin directory to add a #vote method that will be invoked from our controller:
class Poll < ActiveRecord::Base
def vote(answer)
increment(answer == 'yes' ? :yes : :no)
end
end
Generating a controller¶
For now, the plugin doesn't do anything. So let's create a controller for our plugin.
We can use the plugin controller generator for that. Syntax is:
ruby script/rails generate redmine_plugin_controller <plugin_name> <controller_name> [<actions>]
So go back to the command prompt and run:
$ ruby script/rails generate redmine_plugin_controller Polls polls index vote create plugins/polls/app/controllers/polls_controller.rb create plugins/polls/app/helpers/polls_helper.rb create plugins/polls/test/functional/polls_controller_test.rb create plugins/polls/app/views/polls/index.html.erb create plugins/polls/app/views/polls/vote.html.erb
A controller PollsController
with 2 actions (#index
and #vote
) is created.
Edit plugins/polls/app/controllers/polls_controller.rb
to implement these 2 actions.
class PollsController < ApplicationController
unloadable
def index
@polls = Poll.all
end
def vote
poll = Poll.find(params[:id])
poll.vote(params[:answer])
if poll.save
flash[:notice] = 'Vote saved.'
end
redirect_to :action => 'index'
end
end
Then edit plugins/polls/app/views/polls/index.html.erb
that will display existing polls:
<h2>Polls</h2>
<% @polls.each do |poll| %>
<p>
<%= poll.question %>?
<%= link_to 'Yes', { :action => 'vote', :id => poll[:id], :answer => 'yes' }, :method => :post %> (<%= poll.yes %>) /
<%= link_to 'No', { :action => 'vote', :id => poll[:id], :answer => 'no' }, :method => :post %> (<%= poll.no %>)
</p>
<% end %>
You can remove plugins/polls/app/views/polls/vote.html.erb
since no rendering is done by the #vote
action.
Adding routes¶
Redmine does not provide the default wildcard route (':controller/:action/:id'
). Plugins have to declare the routes they need in their proper config/routes.rb
file. So edit plugins/polls/config/routes.rb
to add the 2 routes for the 2 actions:
get 'polls', :to => 'polls#index'
post 'post/:id/vote', :to => 'polls#vote'
You can find more information about Rails routes here: http://guides.rubyonrails.org/routing.html.
Now, restart the application and point your browser to http://localhost:3000/polls.
You should see the 2 polls and you should be able to vote for them:
Internationalization¶
The translation files must be stored in config/locales, eg. plugins/polls/config/locales/
.
Extending menus¶
Our controller works fine but users have to know the url to see the polls. Using the Redmine plugin API, you can extend standard menus.
So let's add a new item to the application menu.
Extending the application menu¶
Edit plugins/polls/init.rb
at the root of your plugin directory to add the following line at the end of the plugin registration block:
Redmine::Plugin.register :redmine_polls do
[...]
menu :application_menu, :polls, { :controller => 'polls', :action => 'index' }, :caption => 'Polls'
end
Syntax is:
menu(menu_name, item_name, url, options={})
There are five menus that you can extend:
:top_menu
- the top left menu:account_menu
- the top right menu with sign in/sign out links:application_menu
- the main menu displayed when the user is not inside a project:project_menu
- the main menu displayed when the user is inside a project:admin_menu
- the menu displayed on the Administration page (can only insert after Settings, before Plugins)
Available options are:
:param
- the parameter key that is used for the project id (default is:id
):if
- a Proc that is called before rendering the item, the item is displayed only if it returns true:caption
- the menu caption that can be:- a localized string Symbol
- a String
- a Proc that can take the project as argument
:before
,:after
- specify where the menu item should be inserted (eg.:after => :activity
):first
,:last
- if set to true, the item will stay at the beginning/end of the menu (eg.:last => true
):html
- a hash of html options that are passed tolink_to
when rendering the menu item
In our example, we've added an item to the application menu which is emtpy by default.
Restart the application and go to http://localhost:3000:
Now you can access the polls by clicking the Polls tab from the welcome screen.
Extending the project menu¶
Now, let's consider that the polls are defined at project level (even if it's not the case in our example poll model). So we would like to add the Polls tab to the project menu instead.
Open init.rb
and replace the line that was added just before with these 2 lines:
Redmine::Plugin.register :redmine_polls do
[...]
permission :polls, { :polls => [:index, :vote] }, :public => true
menu :project_menu, :polls, { :controller => 'polls', :action => 'index' }, :caption => 'Polls', :after => :activity, :param => :project_id
end
The second line adds our Polls tab to the project menu, just after the activity tab. The first line is required and declares that our 2 actions from PollsController
are public. We'll come back later to explain this with more details. Restart the application again and go to one of your projects:
If you click the Polls tab (in 3rd position), you should notice that the project menu is no longer displayed.
To make the project menu visible, you have to initialize the controller's instance variable @project
.
Edit your PollsController to do so:
def index
@project = Project.find(params[:project_id])
@polls = Poll.find(:all) # @project.polls
end
The project id is available in the :project_id
param because of the :param => :project_id
option in the menu item declaration above.
Now, you should see the project menu when viewing the polls:
Adding new permissions¶
For now, anyone can vote for polls. Let's make it more configurable by changing the permission declaration.
We're going to declare 2 project based permissions, one for viewing the polls and an other one for voting. These permissions are no longer public (:public => true
option is removed).
Edit plugins/polls/init.rb
to replace the previous permission declaration with these 2 lines:
permission :view_polls, :polls => :index
permission :vote_polls, :polls => :vote
Restart the application and go to http://localhost:3000/roles/report:
You're now able to give these permissions to your existing roles.
Of course, some code needs to be added to the PollsController so that actions are actually protected according to the permissions of the current user. For this, we just need to append the :authorize
filter and make sure that the Herve Harster instance variable is properly set before calling this filter.
Here is how it would look like for the #index
action:
class PollsController < ApplicationController
unloadable
before_filter :find_project, :authorize, :only => :index
[...]
def index
@polls = Poll.find(:all) # @project.polls
end
[...]
private
def find_project
# @project variable must be set before calling the authorize filter
@project = Project.find(params[:project_id])
end
end
Retrieving the current project before the #vote
action could be done using a similar way.
After this, viewing and voting polls will be only available to admin users or users that have the appropriate role on the project.
If you want to display the symbols of your permissions in a multilangual way, you need to add the necessary text labels in a language file.
Simply create an *.yml (eg. en.yml
) file in plugins/polls/config/locales
and fill it with labels like this:
en: permission_view_polls: View Polls permission_vote_polls: Vote Polls
In this example the created file is known as en.yml
, but all other supported language files are also possible too.
As you can see on the example above, the labels consists of the permission symbols :view_polls
and :vote_polls
with an additional permission_
added at the front.
Restart your application and point the permission section.
Creating a project module¶
For now, the poll functionality is added to all your projects. But you may want to enable polls for some projects only.
So, let's create a 'Polls' project module. This is done by wrapping the permissions declaration inside a call to #project_module
.
Edit init.rb
and change the permissions declaration:
project_module :polls do
permission :view_polls, :polls => :index
permission :vote_polls, :polls => :vote
end
Restart the application and go to one of your project settings.
Click on the Modules tab. You should see the Polls module at the end of the modules list (disabled by default):
You can now enable/disable polls at project level.
Improving the plugin views¶
Adding stylesheets¶
Let's start by adding a stylesheet to our plugin views.
Create a file named voting.css
in the plugins/polls/assets/stylesheets
directory:
a.vote { font-size: 120%; } a.vote.yes { color: green; } a.vote.no { color: red; }
When starting the application, plugin assets are automatically copied to public/plugin_assets/polls/
to make them available through your web server. So any change to your plugin stylesheets or javascripts needs an application restart.
Then, append the following lines at the end of plugins/polls/app/views/polls/index.html.erb
so that your stylesheet get included in the page header by Redmine:
<% content_for :header_tags do %> <%= stylesheet_link_tag 'voting', :plugin => 'polls' %> <% end %>
Note that the :plugin => 'polls'
option is required when calling the stylesheet_link_tag
helper.
Javascripts can be included in plugin views using the javascript_include_tag
helper in the same way.
Setting page title¶
You can set the HTML title from inside your views by using the html_title
helper.
Example:
<% html_title "Polls" %>
Using hooks¶
Hooks in views¶
Hooks in Redmine views lets you insert custom content to regular Redmine views. For example, looking at source:tags/2.0.0/app/views/projects/show.html.erb#L52 shows that there are 2 hooks available: one named :view_projects_show_left
for adding content to the left part and one named :view_projects_show_right
for adding content to the right part of the view.
To use one or more hooks in views, you need to create a class that inherits from Redmine::Hook::ViewListener
and implement methods named with the hook(s) you want to use.
To append some content to the project overview, add a class to your plugin and require it in your init.rb
, then implement methods whose name match the hook names:
# lib/polls_hook_listener.rb
class PollsHookListener < Redmine::Hook::ViewListener
def view_projects_show_left(context={} )
return content_tag("p", "Custom content added to the left")
end
def view_projects_show_right(context={} )
return content_tag("p", "Custom content added to the right")
end
end
You can also use the render_on
helper to render a partial:
# lib/polls_hook_listener.rb
class PollsHookListener < Redmine::Hook::ViewListener
render_on :view_projects_show_left, :partial => "polls/project_overview"
end
Add the partial to your plugin in app/views/polls/_project_overview.html.erb
. Its content will be appended to the left part of the project overview.
Hooks in controllers¶
TODO
Making your plugin configurable¶
TODO
Testing your plugin¶
test/test_helper.rb¶
Here are the contents of my test helper file:
require File.expand_path(File.dirname(__FILE__) + '/../../../test/test_helper')
Sample test¶
Contents of polls_controller_test.rb
:
require File.expand_path('../../test_helper', __FILE__)
class PollsControllerTest < ActionController::TestCase
fixtures :projects
def test_index
get :index, :project_id => 1
assert_response 'success'
assert_template 'index'
end
end
Running test¶
Initialize the test database if necessary:
$ rake db:drop db:create db:migrate db:plugins:migrate redmine:load_default_data RAILS_ENV=test
To execute the polls_controller_test.rb:
$ ruby plugins\polls\test\functionals\polls_controller_test.rb
Testing with permissions¶
If your plugin requires membership to a project, add the following to the beginning of your functional tests:
def test_index @request.session[:user_id] = 2 ... end
If your plugin requires a specific permission, you can add that to a user role like so (lookup which role is appropriate for the user in the fixtures):
def test_index Role.find(1).add_permission! :my_permission ... end
You may enable/disable a specific module like so:
def test_index Project.find(1).enabled_module_names = [:mymodule] ... end
Updated by Denis Savitskiy over 11 years ago · 79 revisions