Review Project
Let’s explore the project code and write some app code.
ApplicationController
The starter project comes with an ApplicationController. It looks like this:
app/controllers/application_controller.rb
class ApplicationController < Jets::Controller::Base
end
Generally, your controllers will inherit from ApplicationController.
Create an API
Let’s create some code for an API. We’ll generate some starter code again.
❯ jets generate scaffold post title:string body:text published:boolean
invoke active_record
create db/migrate/20231028045457_create_posts.rb
create app/models/post.rb
invoke resource_route
route resources :posts
invoke scaffold_controller
create app/controllers/posts_controller.rb
invoke resource_route
The generated code looks something like this:
app/controllers/posts_controller.rb
class PostsController < ApplicationController
before_action :set_post, only: %i[ show update destroy ]
# GET /posts
def index
@posts = Post.all
render json: @posts
end
# GET /posts/1
def show
render json: @post
end
# POST /posts
def create
@post = Post.new(post_params)
if @post.save
render json: @post, status: :created, location: @post
else
render json: @post.errors, status: :unprocessable_entity
end
end
# PATCH/PUT /posts/1
def update
if @post.update(post_params)
render json: @post
else
render json: @post.errors, status: :unprocessable_entity
end
end
# DELETE /posts/1
def destroy
@post.destroy
render json: {deleted: true}
end
private
# Use callbacks to share common setup or constraints between actions.
def set_post
@post = Post.find(params[:id])
end
# Only allow a list of trusted parameters through.
def post_params
params.require(:post).permit(:title, :body, :published)
end
end
It’s a controller with the basic CRUD methods. Jets will create one lambda function to handle all controller requests.
Next, we’ll test the API locally.