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Glossary / Cheatsheet

Layouts and Partials

yield

Yield is used within a layout to render the view.

Yield the view within a div.

<div class="container site-content">
  <div class="row">
    <div class="col-md-6 col-md-offset-3">
      <%= yield %>
    </div>
  </div>
</div>

render

Render the _product.html.erb partial in a view

<%= render "product" %>

Render the partial in shared/_footer.html.erb in a view

<%= render "shared/footer" %>

Render a partial in _product.html.erb and pass it a variable.

# index.html.erb
<% @products.each do |product| %>
  <%= render partial: "product", locals: {product: product} %>
<% end %>

# _product.html.erb
<div>
  Name: <%= product.name %>
</div>

View Helper Methods

Linking to assets

  • image_tag

Form Helper Methods

The following methods are used with form_for to create a <form> element

A form can be constructed for a specific model object by passing it directly.

<%= form_for @business do |f| %>
  name: <%= f.text_field :name %><br />
  website_url : <%= f.text_field :website_url %><br />
  <%= f.submit %>
<% end %>

A form can also be constructed using a symbol which matches a model name.

<%= form_for :person do |f| %>
  First name: <%= f.text_field :first_name %><br />
  Last name : <%= f.text_field :last_name %><br />
  Biography : <%= f.text_area :biography %><br />
  Admin?    : <%= f.check_box :admin %><br />
  <%= f.submit %>
<% end %>

Specifying path (URL) and HTTP verb to use:

<%= form_for @post, as: :post, url: post_path(@post), method: :patch do |f| %>
  ...
<% end %>

Specifying html attributes like id and class:

<%= form_for :person, html: { class: "col-md-6", id: "person_form" } do |f| %>
 ...
<% end %>

Accessing associated resources. In this example, adding a new comment to an article.

<%= form_for([@article, @comment]) do |f| %>
 ...
<% end %>

f.submit

<%= form_for :person do |f| %>
  <%= f.submit %>
<% end %>

Adding a class and calling a javascript function on-click handler:

<%= f.submit ‘Create User’, class: ‘buttons’, :onclick => “validate_user_form_and_submit()” %>

f.text_field

Output: <input type='text'>

Using the first_name attribute on a person object.

<%= form_for :person do |f| %>
  First name: <%= f.text_field :first_name %><br />
<% end %>

Specifying a size:

<%= form_for :person do |f| %>
  <%= text_field(:first_name, size: 20) %>
<% end %>

f.text_area

Output: <textarea>

Generate 2 textareas with 20 columns and 3 rows.

<%= form_for :product do |f| %>
  <%= f.text_area(:description, size: '20x3') %>
  <%= f.text_area(:other, cols: 20, rows: 3) %>
<% end %>

Outputs:

<textarea cols="20" rows="3" id="post_body" name="post[body]">

f.check_box

Output: <input type='checkbox'

Note: there are some major caveats when using checkbox, please see the docs.

  <%= f.check_box("validated") %>
<input name="post[validated]" type="hidden" value="0" />
<input checked="checked" type="checkbox" id="post_validated" name="post[validated]" value="1" />

Note that Rails adds a secondary hidden field. See docs for details.

There's also another checkbox method, collection_check_boxes

f.collection_check_boxes

<%= form_for @post do |f| %>
  <%= f.collection_check_boxes :author_ids, Author.all, :id, :name_with_initial %>
  <%= f.submit %>
<% end %>

Note: For a better explanation see the method wrapped by this one.

f.select

<%= form_for @post do |f| %>
  <%= f.select :person_id, @people.collect { |p| [ p.name, p.id ] }, include_blank: true %>
  <%= f.submit %>
<% end %>

f.date_select

<%= form_for @person do |f| %>
  <%= f.date_select :birth_date %>
  <%= f.submit %>
<% end %>

f.label

<%= form_for :person do |f| %>
  <%= f.label :first_name, "Type your first name:" %>
  <%= text_field(:first_name, size: 20) %>  
<% end %>