Rails cheat sheet - helpers, css/jw packages, forms, controllers, redirection, render, head-only responses, default URL options & more
class ApplicationController
helper_method :logged_in?
def logged_in?
"Something"
end
end
stylesheet_link_tag :monkey
javascript_link_tag :monkey
# http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html
- form_for @person do |f|
= f.label :first_name
= f.label :first_name, "First name"
= f.text_field :first_name
= f.label :last_name>
= f.text_field :last_name>
- fields_for @person.permission do |fields|
= fields.checkbox :admin
-# name="person[admin]"
- fields_for :person, @client do |fields|
= fields.checkbox :admin
= f.submit
# Also: check_box, email_field, fields_for
# file_field, hidden_field, label, number_field, password_field
# radio_button, range_field, search_field, telephonen_field,
# text_area, text_field, url_field
http://apidock.com/rails/ActionController/Base
class ProjectsController
layout 'project' # Actually defaults to `projects` based
# on the controller name
def save
end
def edit
end
end
class ApplicationController < ActionController::Base
before_filter :validate, only: [:save, :edit]
before_filter :ensure_auth, except: [:logout]
before_filter :require_login
private
def require_login
unless logged_in?
flash[:error] = "You must be logged in to access this section"
redirect_to new_login_url # halts request cycle
end
end
end
class ApplicationController < ActionController::Base
# The options parameter is the hash passed in to 'url_for'
def default_url_options(options)
{:locale => I18n.locale}
end
end
class UsersController < ApplicationController
def index
@users = User.all
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @users}
format.json { render :json => @users}
end
end
end
redirect_to action: 'show', id: @entry.id
redirect_to root_url # a path
render nothing: true
render template: 'products/show'
render status: 500
render status: :forbidden
render text: '...'
render layout: 'special_layout'
render layout: false
render action: 'something' # same as `file: 'my/something'`
# Renders the template only, does not execute
# the action
render json: object
render xml: object
render location: photo_url(photo)
head :bad_request
head :created, location: photo_path(@photo)
# app/views/layouts/application.html.erb
<%= content_for?(:content) ? yield :content : yield %>
# app/views/layouts/news.html.erb
<% content_for :content do %>
...
<% end %>
<% render template: :'layouts/application' %>