simple_formの使い方

Railsのform_for内のコードをすっきりさせるsimple_formの使い方 - Rails Webook

上記を参考にsimple_formの使い方を学んだ。

<before>

<%= form_for(@product) do |f| %>
  <% if @product.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@product.errors.count, "error") %> prohibited this product from being saved:</h2>

      <ul>
        <% @product.errors.full_messages.each do |message| %>
          <li><%= message %></li>
        <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.label :name %><br>
    <%= f.text_field :name %>
  </div>
  <div class="field">
    <%= f.label :price %><br>
    <%= f.text_field :price %>
  </div>
  <div class="field">
    <%= f.label :released_on %><br>
    <%= f.date_select :released_on %>
  </div>
  <div class="field">
    <%= f.label :rating %><br />
    <%= f.radio_button :rating, 1 %> 1
    <%= f.radio_button :rating, 2 %> 2
    <%= f.radio_button :rating, 3 %> 3
    <%= f.radio_button :rating, 4 %> 4
    <%= f.radio_button :rating, 5 %> 5
  </div>
  <div class="field">
    <%= f.label :discontinued %><br>
    <%= f.check_box :discontinued %>
  </div>
  <div class="field">
    <%= f.label :publisher_id %><br />
    <%= f.collection_select :publisher_id, Publisher.all, :id, :name, include_blank: true %>
  </div>
  <div class="field">
    <% Category.all.each do |category| %>
      <%= check_box_tag "product[category_ids][]", category.id, @product.category_ids.include?(category.id), id: dom_id(category) %>
      <%= label_tag dom_id(category), category.name %><br />
    <% end %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

<after>

<%= simple_form_for(@product) do |f| %>
  <%= f.input :name %>
  <%= f.input :price %>
  <%= f.input :released_on %>
  <%= f.input :rating %>
  <%= f.input :discontinued %>
  <%= f.association :publisher %>
  <%= f.association :categories %>
  <%= f.button :submit %>
<% end %>

<%= simple_form_for(@product) do |f| %>
  <%= f.input :name %>
  <%= f.input :price %>
  <%= f.input :released_on %>
  <%= f.input :rating %>
  <%= f.input :discontinued %>
  <%= f.association :publisher%>
  <%= f.association :categories %>
  <%= f.button :submit %>
<% end %>

使い方は簡単。

1.Gemfileに追加

gem 'simple_form'

2.bundle install

3.rails g simple_form:install

これをした後にafterのように書き換えればいい。