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ERB templates, helpers, layouts, partials, and view patterns
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
SOC 職業分類に基づく
Export tasks from TodoWrite or feature plans into structured markdown files (epic, user-story, bug, issue) in a tasks/ directory. Use when the user wants to create task files, export tasks, track work in files, or mentions "create tasks", "export", "epic", "user story".
Write, review, and improve Minitest tests for Ruby on Rails applications. Covers model tests, controller tests, system tests, fixtures, and best practices from Rails Testing Guide.
Gather requirements, analyze codebase, and create structured task lists before starting Rails feature development. Use when planning new features, starting development work, breaking down requirements, or when the user mentions "plan", "requirements", "tasks", or "kickoff".
Deploy Rails applications to production using Kamal, Docker, and modern deployment strategies. Covers zero-downtime deployments, environment management, database migrations, SSL/TLS, and production configurations.
Refine and clarify feature requirements by asking targeted follow-up questions, then update or create tasks based on answers. Use after initial planning when requirements need clarification, or when the user mentions "refine", "clarify", "more details", or "questions".
Pagination for Ruby on Rails applications using Kaminari. Use when: (1) Implementing pagination for database records, (2) Building paginated API endpoints, (3) Customizing pagination UI with themes, (4) Handling large datasets efficiently, (5) Creating infinite scroll, (6) Paginating arrays or custom collections, (7) Adding SEO-friendly pagination URLs, (8) Internationalizing pagination labels
| name | rails-views |
| description | ERB templates, helpers, layouts, partials, and view patterns |
| version | 1.0.0 |
| rails_version | >= 7.0 |
| tags | ["views","erb","templates","helpers"] |
| Pattern | Example |
|---|---|
| Output | <%= @post.title %> |
| Code | `<% @posts.each do |
| Link | <%= link_to 'Home', root_path %> |
| Form | `<%= form_with model: @post do |
| Partial | <%= render 'shared/header' %> |
| Helper | <%= truncate @post.body, length: 100 %> |
| Asset | <%= image_tag 'logo.png' %> |
<%# Comment - won't be rendered %>
<% # Ruby code - executed but not displayed %>
<% if user_signed_in? %>
<p>Welcome back!</p>
<% end %>
<%= # Ruby code with output %>
<%= @post.title %>
<%= current_user.name %>
<%== # Output without HTML escaping (dangerous!) %>
<%== raw_html_content %>
<%- # Suppress whitespace before tag %>
<%- if condition -%>
<%= # Safe output (escapes HTML by default) %>
<%= user_input %> <%# Safe from XSS %>
<%# app/views/layouts/application.html.erb %>
<!DOCTYPE html>
<html>
<head>
<title><%= content_for?(:title) ? yield(:title) : "My App" %></title>
<%= csrf_meta_tags %>
<%= csp_meta_tag %>
<%= stylesheet_link_tag "application", "data-turbo-track": "reload" %>
<%= javascript_importmap_tags %>
<%= yield :head %>
</head>
<body class="<%= controller_name %> <%= action_name %>">
<%= render 'shared/header' %>
<% flash.each do |type, message| %>
<div class="alert alert-<%= type %>">
<%= message %>
</div>
<% end %>
<main>
<%= yield %>
</main>
<%= render 'shared/footer' %>
</body>
</html>
<%# In view template %>
<% content_for :title do %>
<%= @post.title %> - My Blog
<% end %>
<% content_for :head do %>
<%= stylesheet_link_tag "posts" %>
<meta name="description" content="<%= @post.excerpt %>">
<% end %>
<%# Content here will be yielded in layout %>
<article>
<%= @post.body %>
</article>
<%# Render partial %>
<%= render 'shared/header' %>
<%= render 'post' %>
<%= render partial: 'post' %>
<%# With local variables %>
<%= render 'post', post: @post %>
<%= render partial: 'post', locals: { post: @post, show_author: true } %>
<%# Partial file: app/views/shared/_header.html.erb %>
<header>
<h1>My Blog</h1>
</header>
<%# Partial file: app/views/posts/_post.html.erb %>
<article>
<h2><%= post.title %></h2>
<p><%= post.body %></p>
<% if local_assigns[:show_author] %>
<p>By <%= post.author.name %></p>
<% end %>
</article>
<%# Render for each item %>
<%= render partial: 'post', collection: @posts %>
<%# Shorthand %>
<%= render @posts %>
<%# With local variable name %>
<%= render partial: 'post', collection: @posts, as: :item %>
<%# With spacer template %>
<%= render partial: 'post', collection: @posts, spacer_template: 'post_divider' %>
<%# In partial, access current index %>
<article data-index="<%= post_counter %>">
<%= post.title %>
</article>
<%= form_with model: @post do |f| %>
<% if @post.errors.any? %>
<div class="errors">
<h3><%= pluralize(@post.errors.count, "error") %> prohibited this post from being saved:</h3>
<ul>
<% @post.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :title %>
<%= f.text_field :title, class: 'form-control' %>
</div>
<div class="field">
<%= f.label :body %>
<%= f.text_area :body, rows: 10, class: 'form-control' %>
</div>
<div class="field">
<%= f.label :published %>
<%= f.check_box :published %>
</div>
<div class="field">
<%= f.label :category_id %>
<%= f.collection_select :category_id, Category.all, :id, :name,
{ prompt: 'Select a category' }, { class: 'form-control' } %>
</div>
<div class="field">
<%= f.label :tag_ids %>
<%= f.collection_check_boxes :tag_ids, Tag.all, :id, :name %>
</div>
<div class="actions">
<%= f.submit "Save Post", class: 'btn btn-primary' %>
</div>
<% end %>
<%= f.text_field :name %>
<%= f.text_area :description %>
<%= f.password_field :password %>
<%= f.email_field :email %>
<%= f.url_field :website %>
<%= f.number_field :age %>
<%= f.date_field :birthday %>
<%= f.datetime_field :published_at %>
<%= f.time_field :starts_at %>
<%= f.hidden_field :user_id %>
<%= f.check_box :published %>
<%= f.radio_button :status, 'active' %>
<%= f.select :category_id, Category.pluck(:name, :id) %>
<%= f.collection_select :author_id, User.all, :id, :name %>
<%= f.collection_radio_buttons :status, Status.all, :id, :name %>
<%= f.collection_check_boxes :tag_ids, Tag.all, :id, :name %>
<%= f.file_field :avatar %>
<%= form_with url: search_path, method: :get do |f| %>
<%= f.text_field :query, placeholder: 'Search...' %>
<%= f.submit 'Search' %>
<% end %>
<%# Basic link %>
<%= link_to 'Home', root_path %>
<%= link_to 'Edit', edit_post_path(@post) %>
<%= link_to 'Delete', post_path(@post), data: { turbo_method: :delete, turbo_confirm: 'Are you sure?' } %>
<%# Link to object (uses polymorphic routing) %>
<%= link_to @post.title, @post %>
<%= link_to 'Edit', [:edit, @post] %>
<%# Link with block %>
<%= link_to post_path(@post) do %>
<strong><%= @post.title %></strong>
<p><%= @post.excerpt %></p>
<% end %>
<%# Link classes and data attributes %>
<%= link_to 'Click', path, class: 'btn btn-primary', data: { action: 'click->controller#method' } %>
<%# Button to (generates a form) %>
<%= button_to 'Delete', post_path(@post), method: :delete, class: 'btn btn-danger' %>
<%# Mail to %>
<%= mail_to 'user@example.com' %>
<%= mail_to 'user@example.com', 'Contact Us', subject: 'Hello' %>
<%# Images %>
<%= image_tag 'logo.png' %>
<%= image_tag 'logo.png', alt: 'Logo', class: 'logo', size: '100x100' %>
<%= image_tag @post.cover_image_url %>
<%# Stylesheets %>
<%= stylesheet_link_tag 'application' %>
<%= stylesheet_link_tag 'posts', media: 'all' %>
<%# JavaScript %>
<%= javascript_include_tag 'application' %>
<%= javascript_importmap_tags %>
<%# Asset path %>
<%= asset_path 'image.png' %>
<%= asset_url 'image.png' %>
<%= truncate @post.body, length: 100 %>
<%= truncate @post.body, length: 100, separator: ' ' %>
<%= simple_format @post.body %>
<%= pluralize @posts.count, 'post' %>
<%= number_to_currency 29.99 %>
<%= number_to_percentage 85.5 %>
<%= number_with_delimiter 1000000 %>
<%= number_to_human 1234567 %>
<%= time_ago_in_words @post.created_at %>
<%= distance_of_time_in_words Time.now, @post.created_at %>
<%= content_tag :div, "Hello", class: 'greeting' %>
<%# Output: <div class="greeting">Hello</div> %>
<%= content_tag :div, class: 'post' do %>
<%= @post.title %>
<% end %>
<%= tag.div "Hello", class: 'greeting' %>
<%= tag.div class: 'post' do %>
<%= @post.title %>
<% end %>
<%# Strip all HTML tags %>
<%= strip_tags @post.html_content %>
<%# Allow specific tags %>
<%= sanitize @post.html_content, tags: %w[p br strong em] %>
<%# Escape HTML %>
<%= html_escape user_input %>
<%= h user_input %> <%# shorthand %>
# app/helpers/application_helper.rb
module ApplicationHelper
def page_title(title)
content_for(:title) { title }
content_tag(:h1, title, class: 'page-title')
end
def active_link(text, path, **options)
active = current_page?(path)
classes = options[:class].to_s
classes += ' active' if active
link_to text, path, class: classes
end
def formatted_date(date)
return 'N/A' unless date
date.strftime('%B %d, %Y')
end
def user_avatar(user, size: 50)
if user.avatar.attached?
image_tag user.avatar.variant(resize_to_limit: [size, size])
else
image_tag "default-avatar.png", size: "#{size}x#{size}"
end
end
end
<%# Using custom helpers %>
<%= page_title "My Posts" %>
<%= active_link "Home", root_path, class: 'nav-link' %>
<%= formatted_date @post.created_at %>
<%= user_avatar current_user, size: 100 %>
<%# Turbo Frame %>
<%= turbo_frame_tag "post_#{@post.id}" do %>
<%= render @post %>
<% end %>
<%# Turbo Frame with lazy loading %>
<%= turbo_frame_tag "post_#{@post.id}", src: post_path(@post), loading: :lazy do %>
Loading...
<% end %>
<%# Target a specific frame %>
<%= link_to "Edit", edit_post_path(@post), data: { turbo_frame: "post_#{@post.id}" } %>
<%# app/views/posts/create.turbo_stream.erb %>
<%= turbo_stream.prepend "posts" do %>
<%= render @post %>
<% end %>
<%= turbo_stream.update "flash" do %>
<div class="notice">Post created!</div>
<% end %>
<%# Available actions: append, prepend, replace, update, remove, before, after %>
<% if user_signed_in? %>
<p>Welcome, <%= current_user.name %>!</p>
<%= link_to "Logout", logout_path, data: { turbo_method: :delete } %>
<% else %>
<%= link_to "Login", login_path %>
<% end %>
<% unless @posts.empty? %>
<%= render @posts %>
<% else %>
<p>No posts yet.</p>
<% end %>
<%# Ternary operator %>
<%= @post.published? ? "Published" : "Draft" %>
<% @posts.each do |post| %>
<%= render post %>
<% end %>
<% @posts.each_with_index do |post, index| %>
<div class="post-<%= index + 1 %>">
<%= render post %>
</div>
<% end %>
<%# Check if collection is empty %>
<% if @posts.any? %>
<% @posts.each do |post| %>
<%= render post %>
<% end %>
<% else %>
<p>No posts found.</p>
<% end %>
<%= %>)<div class="<%= 'active' if @post.published? %> post">
...
</div>
<%# Better with helper %>
<div class="<%= post_classes(@post) %>">
...
</div>
# In helper
def post_classes(post)
classes = ['post']
classes << 'published' if post.published?
classes << 'featured' if post.featured?
classes.join(' ')
end
<% if @posts.any? %>
<%= render @posts %>
<% else %>
<div class="empty-state">
<p>No posts yet.</p>
<%= link_to "Create your first post", new_post_path, class: 'btn' %>
</div>
<% end %>