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====== Learnexa GrapphQL API ======

===== Implementation =====

1) Create new Ruby on Rails application
<code>
Ruby Verions 2.6.2
Rails verions 5.1.4

rails new learnexa_api -d mysql
</code>

2) Add GraphQL in gem file

<code>
gem 'graphql', '~>1.8.10'

bundle install
</code>

3) Add GraphQL to a Rails app

<code>
rails g graphql:install

bundle install
</code>

4) Add existing learnexa db in database.yml file

<code>
default: &default
  adapter: mysql2
  encoding: utf8
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: root
  password: root
  socket: /var/run/mysqld/mysqld.sock

development:
  <<: *default
  database: learnexa_db
</code>

5) Recreate all learnexa models(Sample code given below):

app/models/course.rb

<code>
class Course < ApplicationRecord
  has_many :course_contents, -> { order :position }, :dependent => :destroy
  has_many :contents, :through => :course_contents
end
</code>

app/models/course_content.rb

<code>
class CourseContent < ApplicationRecord
  belongs_to :course
  belongs_to :content
end
</code>

app/models/content.rb

<code>
class Content < ApplicationRecord
end
</code>

6) Create course_type.rb file in app/grapghql/types folder:

<code>
module Types
  class CourseType < BaseObject
    field :id, ID, null: false
    field :title, String, null: false
    field :course_contents, [Types::CourseContentType], null: false
    field :contents, [Types::ContentType], null: false
  end
end
</code>

7) Also create content_type.rb, course_content_type.rb files

content_type.rb
<code>
module Types
  class ContentType < BaseObject
    field :id, ID, null: false
    field :title, String, null: false
    field :created_at, String, null: false
    field :updated_at, String, null: false
  end
end
</code>

course_content_type.rb

<code>
module Types
  class CourseContentType < BaseObject
    field :id, ID, null: false
    field :maximum_attempts, Integer, null: false
    field :course, Types::CourseType, null: false
  end
end
</code>

8) In app/grapghql/types/quert_type.rb files add the query methods

<code>
module Types
  class QueryType < Types::BaseObject
    field :all_courses, [Types::CourseType], null: false
    field :get_course, CourseType, null: false do
      argument :id, ID, required: true
    end

def all_courses
      Course.all
    end

def get_course(id:)
      Course.find(id)
    end
  end
end
</code>

9) Build a schema with QueryType as the query entry point:

app/grapghql/learnexa_api_schema.rb

<code>
class LearnexaApiSchema < GraphQL::Schema
  mutation Types::MutationType
  query Types::QueryType
end
</code>

10) Start rails server
Open localhost:3000/graphiql to gew

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