Grape::Jbuilder

Use Jbuilder templates in Grape!

This gem is completely based on grape-rabl.

Installation

Add this line to your application's Gemfile:

gem 'grape-jbuilder'

And then execute:

$ bundle

Or install it yourself as:

$ gem install grape-jbuilder

Usage

Require grape-jbuilder

# config.ru
require 'grape/jbuilder'

Setup view root directory

# config.ru
require 'grape/jbuilder'

use Rack::Config do |env|
  env['api.tilt.root'] = '/path/to/view/root/directory'
end

Tell your API to use Grape::Formatter:: Jbuilder

class API < Grape::API
  format :json
  formatter :json, Grape::Formatter::Jbuilder
end

Use Jbuilder templates conditionally

Add the template name to the API options.

get '/user/:id', jbuilder: 'user.jbuilder' do
  @user = User.find(params[:id])
end

You can use instance variables in the Jbuilder template.

json.user do
  json.(@user, :name, :email)
  json.project do
    json.(@project, :name)
  end
end

Use Jbuilder templates dynamically

get ':id' do
  user = User.find_by(id: params[:id])
  if article
    env['api.tilt.template'] = 'users/show'
    env['api.tilt.locals']   = {user: user}
  else
    status 404
    {'status' => 'Not Found', 'errors' => "User id '#{params[:id]}' is not found."}
  end
end

You can omit .jbuilder

The following are identical.

get '/home', jbuilder: 'view'
get '/home', jbuilder: 'view.jbuilder'

Example

# config.ru
require 'grape/jbuilder'

use Rack::Config do |env|
  env['api.tilt.root'] = '/path/to/view/root/directory'
end

class UserAPI < Grape::API
  format :json
  formatter :json, Grape::Formatter::Jbuilder

  # use Jbuilder with 'user.jbuilder' template
  get '/user/:id', jbuilder: 'user' do
    @user = User.find(params[:id])
  end

  # do not use jbuilder, fallback to the defalt Grape JSON formatter
  get '/users' do
    User.all
  end
end

# user.jbuilder
json.user do
  json.(@user, :name)
end

Usage with Rails

Create a grape application.

# app/api/user.rb
class MyAPI < Grape::API
  format :json
  formatter :json, Grape::Formatter::Jbuilder
  get '/user/:id', jbuilder: 'user' do
    @user = User.find(params[:id])
  end
end

# app/views/api/user.jbuilder
json.user do
  json.(@user, :name)
end

Edit your config/application.rb and add view path

# application.rb
class Application < Rails::Application
  config.middleware.use(Rack::Config) do |env|
    env['api.tilt.root'] = Rails.root.join 'app', 'views', 'api'
  end
end

Mount application to Rails router

# routes.rb
GrapeExampleRails::Application.routes.draw do
  mount MyAPI , at: '/api'
end

Rspec

See "Writing Tests" in https://github.com/intridea/grape.

Enjoy :)

Special Thanks

Special thanks to @LTe because this gem is completely based on grape-rabl.

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request