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Pagination in Rails using will_paginate. Use when adding page navigation to index actions or API endpoints.
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Configures Solid Queue for background jobs in Rails 8. Use when setting up background processing, creating background jobs, configuring job queues, or migrating from Sidekiq to Solid Queue.
Rails error handling - custom exception hierarchy, rescue_from in controllers, consistent API error responses, Sentry integration, and the bridge between dry-monads Failure() and HTTP status codes.
| name | pagination-patterns |
| description | Pagination in Rails using will_paginate. Use when adding page navigation to index actions or API endpoints. |
| allowed-tools | Read, Write, Edit, Bash, Glob, Grep |
# Gemfile
gem "will_paginate"
# Controller
def index
@page = params[:page] || 1
@posts = Post.published.order(created_at: :desc)
.paginate(page: @page, per_page: 25)
end
Works on any ActiveRecord relation — scopes, joins, includes, anything:
@messages = User.role_support.last
.unread_messages
.order(:conversation_id)
.paginate(page: @page, per_page: 25)
<%= render @posts %>
<%= will_paginate @posts %>
def index
@posts = Post.published.order(created_at: :desc)
.paginate(page: params[:page], per_page: 25)
render json: {
posts: PostSerializer.render(@posts),
page: @posts.current_page,
total_pages: @posts.total_pages,
total: @posts.total_entries
}
end
# spec/requests/posts_spec.rb
RSpec.describe "Posts", type: :request do
let!(:posts) { create_list(:post, 30, :published) }
it "renders first page with pagination nav" do
get posts_path
expect(response).to have_http_status(:ok)
# will_paginate renders a <div class="will-paginate"> nav when multiple pages exist
expect(response.body).to include("will-paginate")
# Only 25 of 30 posts on page 1 — last 5 posts appear only on page 2
expect(response.body).not_to include(posts.last.title)
end
it "renders page 2 with remaining records" do
get posts_path, params: { page: 2 }
expect(response).to have_http_status(:ok)
expect(response.body).to include(posts.last.title)
end
end
# For API endpoints — parse JSON response
RSpec.describe "Posts API", type: :request do
before { create_list(:post, 30, :published) }
it "paginates results" do
get posts_path, as: :json
json = response.parsed_body
expect(json["posts"].size).to eq(25)
expect(json["total_pages"]).to eq(2)
expect(json["total"]).to eq(30)
end
end
gem "will_paginate" in Gemfile.paginate(page: params[:page], per_page: N) on the relationwill_paginate @collection in the viewincludes() on the relation to prevent N+1