{"id":24659,"date":"2019-08-07T12:14:04","date_gmt":"2019-08-07T09:14:04","guid":{"rendered":"https:\/\/www.webcodegeeks.com\/?p=24659"},"modified":"2019-08-07T12:25:04","modified_gmt":"2019-08-07T09:25:04","slug":"developer-series-spinning-json-api","status":"publish","type":"post","link":"https:\/\/www.webcodegeeks.com\/ruby\/developer-series-spinning-json-api\/","title":{"rendered":"Ruby on Rails Developer Series: Spinning Up a JSON API in Minutes"},"content":{"rendered":"\n

Welcome to the first of four Ruby on Rails Developer Series. In this series, the goal is to outline how to strengthen your API with Postgres, how to dockerize your project and add security layers to mitigate attacks to your application. In this article, we\u2019ll cycle through building a quick API-only application uses the JSON API from Active Model Serializer. Then construct a basic CRUD Controller API example on retrieving the User information. While the process is outlined and best practices are used. The goal of the series is to make you feel confident as an engineer in building a structured project with Ruby on Rails.<\/p>\n\n\n\n

Let\u2019s Begin<\/h2>\n\n\n\n

Let\u2019s start off by using the --api<\/code> command in the console to provision an api only preset.<\/p>\n\n\n\n

rails new rails-json-api-test --api<\/code><\/p>\n\n\n\n

This will generate the following:<\/h2>\n\n\n\n
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\n
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app\/controllers<\/code><\/div>\n
 <\/div>\n
app\/assets<\/code><\/div>\n
 <\/div>\n
app\/helpers<\/code><\/div>\n
 <\/div>\n
app\/models<\/code><\/div>\n
 <\/div>\n
config<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n\n\n\n

Objective CRUD<\/h2>\n\n\n\n

Our goal is to use the ActiveModel::Serializer \u2013 JSON API \u2013 which is included by default in your Gemfile when you create an application using the --api<\/code> directive. We will then work toward spinning up a basic CRUD endpoint for a user.<\/p>\n\n\n\n

Below is the endpoint we plan to implement and http methods we plan to send to the API.<\/p>\n\n\n\n

Path: \/api\/v1\/users<\/code><\/p>\n\n\n\n

\n
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1<\/div>\n
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GET<\/code><\/div>\n
POST<\/code><\/div>\n
PUT<\/code><\/div>\n
DELETE<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n\n\n\n

Next, we need to generate the basic User Model that we want to create using the rails generate command for Models:<\/p>\n\n\n\n

First, we need to set up our database. In this example, we will be using PG (Postgres) and will set up the minimum requirement to allow us to proceed to build our API and come back to this in the next article.<\/p>\n\n\n\n

gem pg<\/code><\/p>\n\n\n\n

Then we need to set up our database.yml<\/code> file<\/p>\n\n\n\n

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default<\/code>: &<\/code>default<\/code><\/div>\n
  <\/code>adapter: postgresql<\/code><\/div>\n
  <\/code>host: localhost<\/code><\/div>\n
  <\/code>port: 5432<\/code><\/div>\n
  <\/code>encoding: utf8<\/code><\/div>\n
  <\/code>pool: 5<\/code><\/div>\n
  <\/code>database: rails-json-api<\/code><\/div>\n
  <\/code>username: development<\/code><\/div>\n
  <\/code>password: development<\/code><\/div>\n
 <\/div>\n
development: &<\/code>default<\/code><\/div>\n
  <\/code>adapter: postgresql<\/code><\/div>\n
  <\/code>host: localhost<\/code><\/div>\n
  <\/code>port: 5432<\/code><\/div>\n
  <\/code>encoding: utf8<\/code><\/div>\n
  <\/code>pool: 5<\/code><\/div>\n
  <\/code>database: rails-json-api-dev<\/code><\/div>\n
  <\/code>username: development<\/code><\/div>\n
  <\/code>password: development<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n\n\n\n

Then we\u2019re ready to create the database and build our table.<\/p>\n\n\n\n

rake db:create<\/code><\/p>\n\n\n\n

rails g model User first_name:string last_name:string email:string<\/code><\/p>\n\n\n\n

That should generate something like this:<\/p>\n\n\n\n

\n
\n\n\n\n
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\n
invoke  active_record<\/code><\/div>\n
  <\/code>create    db\/migrate\/20190521020122_create_users.rb<\/code><\/div>\n
  <\/code>create    app\/models\/user.rb<\/code><\/div>\n
  <\/code>invoke    test_unit<\/code><\/div>\n
  <\/code>create      test\/models\/user_test.rb<\/code><\/div>\n
  <\/code>create      test\/fixtures\/users.yml<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n\n\n\n

Now let\u2019s work on the serializer side of things of how the API will respond to the request.<\/p>\n\n\n\n

We will want to uncheck this in the gemfile:<\/p>\n\n\n\n

gem 'active_model_serializers', '~> 0.10.0'<\/code><\/p>\n\n\n\n

When we make the controller we will need the namespaces to be setup:<\/p>\n\n\n\n

For the namespace to change fromApi::V1::UsersController<\/code> to API::V1:UsersController<\/code> we need to modify the inflection file which was generated in config\/initializers\/inflections.rb<\/code>. We will then need to uncomment and add this to the file:<\/p>\n\n\n\n

\n
\n\n\n\n
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ActiveSupport::Inflector.inflections(:en) <\/code>do<\/code> |inflect|<\/code><\/div>\n
  <\/code>inflect.acronym <\/code>'API'<\/code><\/div>\n
end<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n\n\n\n

Lock down your routes to ONLY ALLOW<\/code> these method requests.<\/p>\n\n\n\n

\n
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Rails.application.routes.draw <\/code>do<\/code><\/div>\n
  <\/code>namespace<\/code> :api, path: <\/code>''<\/code> do<\/code><\/div>\n
    <\/code>namespace<\/code> :v1 <\/code>do<\/code><\/div>\n
      <\/code>resources :users, only: [:index, :show, :create, :update, :destroy]<\/code><\/div>\n
    <\/code>end<\/code><\/div>\n
  <\/code>end<\/code><\/div>\n
end<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n\n\n\n

This is what our controller looks like to be able to support our methods:<\/p>\n\n\n\n

\n
\n\n\n\n
\n
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class<\/code> API::V1::UsersController < ApplicationController<\/code><\/div>\n
  <\/code>rescue_from ActiveRecord::RecordNotFound, with: :record_not_found<\/code><\/div>\n
 <\/div>\n
  <\/code>def index<\/code><\/div>\n
    <\/code>users = User.all<\/code><\/div>\n
    <\/code>render json: users, each_serializer: UserSerializer, adapter: :json_api, status: 200<\/code><\/div>\n
  <\/code>end<\/code><\/div>\n
 <\/div>\n
  <\/code>def show<\/code><\/div>\n
    <\/code>user = User.find(params[:id])<\/code><\/div>\n
    <\/code>render json: user, serializer: UserSerializer, adapter: :json_api, status: 200<\/code><\/div>\n
  <\/code>end<\/code><\/div>\n
 <\/div>\n
  <\/code>def create<\/code><\/div>\n
    <\/code>user = User.<\/code>new<\/code>(user_params)<\/code><\/div>\n
    <\/code>render json: user, serializer: UserSerializer, adapter: :json_api, status: 200 <\/code>if<\/code> user.save!<\/code><\/div>\n
  <\/code>end<\/code><\/div>\n
 <\/div>\n
  <\/code>def update<\/code><\/div>\n
    <\/code>user = User.find(params[:id])<\/code><\/div>\n
    <\/code>render json: user, serializer: UserSerializer, adapter: :json_api, status: 200 <\/code>if<\/code> user.update(user_params)<\/code><\/div>\n
  <\/code>end<\/code><\/div>\n
 <\/div>\n
  <\/code>def destroy<\/code><\/div>\n
    <\/code>user = User.find(params[:id])<\/code><\/div>\n
    <\/code>render json: user, serializer: UserSerializer, adapter: :json_api, status: 200 <\/code>if<\/code> user.destroy!<\/code><\/div>\n
  <\/code>end<\/code><\/div>\n
 <\/div>\n
  <\/code>private<\/code><\/div>\n
 <\/div>\n
  <\/code>def record_not_found<\/code><\/div>\n
    <\/code>render json: { message: <\/code>'Record Not Found!'<\/code>}, adapter: :json_api, status: 404<\/code><\/div>\n
  <\/code>end<\/code><\/div>\n
 <\/div>\n
end<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n\n\n\n

Responding with JSON<\/h2>\n\n\n\n

JSON API is a format that works to optimize http(s) requests mainly to promote more productivity and efficiency. JSON API comes with strong caching functionality as data changes affect fewer resources.<\/p>\n\n\n\n

You can simply add this to the Serializer to implement basic key-based cache expiration:<\/p>\n\n\n\n

\n
\n\n\n\n
\n
1<\/div>\n<\/td>\n
\n
\n
cache key: <\/code>'user'<\/code>, expires_in: 3.hours<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n\n\n\n

Conclusion<\/h2>\n\n\n\n
\"\"<\/figure><\/div>\n\n\n\n

We have just spun up a JSON API in a few minutes for our User Table. We have left some items for the next part of the series to strengthen our API-based application. In the next article, we will further work on building a strong JSON API and using Postgres to your advantage.<\/p>\n\n\n\n

This project is available on my repo here<\/a><\/p>\n\n\n\n

Additional resources<\/h2>\n\n\n\n
  1. Learn how to tame the Jenkins JSON API<\/a> with Depth and \u201cTree.\u201d<\/li>
  2. How do JSON and XML compare? Find out here<\/a>.<\/li>
  3. Discover what JSON Schema is<\/a> and what role it plays.<\/li><\/ol>\n\n\n\n
    \n\n\n\n
    \n

    Published on Web Code Geeks with permission by Evan Glazer, partner at our WCG program<\/a>. See the original article here: Ruby on Rails Developer Series: Spinning Up a JSON API in Minutes<\/a><\/p>\n

    Opinions expressed by Web Code Geeks contributors are their own.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

    Welcome to the first of four Ruby on Rails Developer Series. In this series, the goal is to outline how to strengthen your API with Postgres, how to dockerize your project and add security layers to mitigate attacks to your application. In this article, we\u2019ll cycle through building a quick API-only application uses the JSON …<\/p>\n","protected":false},"author":10271,"featured_media":921,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21],"tags":[40,95],"class_list":["post-24659","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ruby","tag-json","tag-rails"],"yoast_head":"\nRuby on Rails Developer Series: Spinning Up a JSON API in Minutes - Web Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"Interested to learn about Spinning Up a JSON API? 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