Implement graphql

Gemfile

@@ -10,8 +10,9 @@ gem 'rack-cors', require: 'rack/cors'
 gem "active_model_serializers"
 gem "cancancan", "~> 1.10"
 gem "faker"
+gem "graphql"
+gem "graphiql-rails"
 
-gem "rack-cors", require: "rack/cors"
 group :production do
   gem "rails_12factor"
   gem "pg"

Gemfile.lock

@@ -69,6 +69,9 @@ GEM
       thor (~> 0.14)
     globalid (0.3.7)
       activesupport (>= 4.1.0)
+    graphiql-rails (1.3.0)
+      rails
+    graphql (0.18.11)
     hashdiff (0.3.0)
     i18n (0.7.0)
     json (1.8.3)
@@ -192,6 +195,8 @@ DEPENDENCIES
   faker
   faraday
   figaro
+  graphiql-rails
+  graphql
   jwt
   pg
   pry-rails

app/controllers/api/v2/graph_controller.rb

@@ -0,0 +1,13 @@
+module Api
+  module V2
+    class GraphController < ApplicationController
+      def process_query
+        @current_user = User.last
+        query = params[:query]
+        vars = params[:variables] || {}
+        result = ProverbSchema.execute(query, variables: vars, context: {current_user: @current_user} )
+        render json: result
+      end
+    end
+  end
+end

app/graph/mutations/authenticate_user.rb

@@ -0,0 +1,25 @@
+AuthenticateUser = GraphQL::Relay::Mutation.define do
+  name "Authenticate user"
+  description "Authenticates the user"
+
+  input_field :access_token, !types.String
+  return_field :user, !UserType
+  return_field :token, !types.String
+
+  resolve -> (inputs, ctx){
+    params = {
+      fields: FIELDS,
+      access_token: inputs["access_token"]
+    }
+
+    http_client = Api::V1::Http.new(FB_URL)
+    response, status = http_client.get_request(params)
+
+    if status != "200"
+      raise GraphQL::ExecutionError, "Could not validate user"
+    end
+    user = User.find_or_create_user(response)
+    token = Authenticate.create_token(fb_id: user.fb_id, email: user.email)
+    { token: token, user: user }
+  }
+end

app/graph/mutations/create_proverb.rb

@@ -0,0 +1,19 @@
+CreateProverb = GraphQL::Relay::Mutation.define do
+  name "Create Proverb"
+  description "Create proverbs"
+
+  input_field :language, !types.String
+  input_field :body, !types.String
+  input_field :root_id, types.ID
+  input_field :tags, types.String
+
+  return_field :proverb, ProverbType
+
+  resolve -> (inputs, context){
+    user = context[:current_user]
+    raise GraphQL::ExecutionError, "you need to be authorized to completed this action" unless user
+
+    tags = inputs["tags"] ? inputs.split(",") : []
+    {proverb: Proverb.create(body: inputs["body"], language: inputs["language"], root_id: inputs["root_id"], all_tags: tags, user: user)}
+  }
+end

app/graph/mutations/mutation_type.rb

@@ -0,0 +1,9 @@
+MutationType = GraphQL::ObjectType.define do
+  name "Root mutation"
+  description "Entry point for resources changes"
+
+  field :create_proverb, field: CreateProverb.field
+  # field :delete_proverb, field: DeleteProverb.field
+  # field :update_proverb, field: UpdateProverb.field
+  field :authenticate_user, field: AuthenticateUser.field
+end

app/graph/proverb_schema.rb

@@ -0,0 +1,9 @@
+ProverbSchema = GraphQL::Schema.define do
+  query QueryType
+  mutation MutationType
+  max_depth 8
+end
+
+ProverbSchema.rescue_from(ActiveRecord::RecordInvalid) do |error|
+  error.record.errors.messages.to_json
+end

app/graph/types/proverb_type.rb

@@ -0,0 +1,29 @@
+ProverbType = GraphQL::ObjectType.define do
+  name "Proverb"
+  description "A proverb"
+
+  field :id, types.ID, "Proverb Id"
+  field :body, types.String, "body of the proverb"
+  field :language, types.String, "language of the proverb"
+  field :status, types.String, "status of proverb"
+  field :created_at, types.String, "date proverb was created"
+  field :updated_at, types.String, "data proverb was last updated"
+  field :user do
+    type UserType
+    resolve -> (obj, args, ctx){
+      obj.user
+    }
+  end
+  field :translations do
+    type types[ProverbType]
+    resolve -> (obj, args, ctx){
+      obj.translations
+    }
+  end
+  field :tags do
+    type types[TagType]
+    resolve -> (obj, args, ctx){
+      obj.tags
+    }
+  end
+end

app/graph/types/query_type.rb

@@ -0,0 +1,32 @@
+directionEnum = GraphQL::EnumType.define do
+  name "Query Direction"
+  description "Query order by value"
+  value "desc", "order in descending order by id"
+  value "asc", "order in ascending order by id"
+end
+
+QueryType = GraphQL::ObjectType.define do
+  name "Query"
+  description "the query root for this schema"
+
+  field :proverb do
+    type ProverbType
+    argument :id, !types.ID, "the id of the proverb to retrieve"
+    resolve -> (obj, args, ctx){
+      Proverb.find_by(id: args["id"])
+    }
+  end
+
+  field :proverbs do
+    type types[ProverbType]
+    argument :limit, types.Int, default_value: 10
+    argument :random, types.Boolean, default_value: false
+    argument :direction, directionEnum, default_value: "desc"
+    argument :offset, types.Int, default_value: 0
+    argument :tags, types.String
+    argument :language, types.String
+    resolve -> (obj, args, ctx){
+      Proverb.search(args)
+    }
+  end
+end

app/graph/types/tag_type.rb

@@ -0,0 +1,15 @@
+TagType = GraphQL::ObjectType.define do
+  name "Tag"
+  description "A tag"
+
+  field :id, types.ID, "Tag Id"
+  field :name, types.String, "Name of the tag"
+  field :created_at, types.String, "Data tag was created"
+  field :updated_at, types.String, "Data tag was last updated"
+  field :proverbs do
+    type !types[!ProverbType]
+    resolve -> (obj, args, ctx){
+      obj.proverbs
+    }
+  end
+end

app/graph/types/user_type.rb

@@ -0,0 +1,28 @@
+UserTypeEnum = GraphQL::EnumType.define do
+  name "UserType"
+  description "User types"
+
+  value "regular", "default user type"
+  value "moderator", "can approved proverbs"
+  value "admin", "super user"
+end
+
+UserType = GraphQL::ObjectType.define do
+  name "User"
+  description "A user"
+
+  field :id, types.ID, "User Id"
+  field :email, types.String, "User email"
+  field :first_name, types.String, "User first name"
+  field :last_name, types.String, "User last name"
+  field :fb_id, types.String, "User Facebook id"
+  field :created_at, types.String, "Date user was created"
+  field :updated_at, types.String, "Date user information was last updated"
+  field :user_type, UserTypeEnum
+  field :proverbs do
+    type types[ProverbType]
+    resolve -> (obj, args, ctx){
+      obj.proverbs
+    }
+  end
+end

app/models/proverb.rb

@@ -20,4 +20,19 @@ def all_tags=(proverb_tags)
   def all_tags
     self.tags.map(&:name).join(", ")
   end
+
+  def self.search(params)
+    query = self.includes(:user)
+    if params["tags"]
+      query = query.joins(:tags).where(tags: {name: params["tags"].split(",")})
+    end
+
+    if params["language"]
+      query = query.where(language: params["language"].split(","))
+    end
+
+    ord = params["random"] ? "RANDOM()" : "id #{params["direction"]}"
+
+     query.limit(params["limit"]).order(ord).offset("#{params["offset"]}")
+  end
 end

config/application.rb

@@ -21,12 +21,6 @@ class Application < Rails::Application
     # Application configuration should go into files in config/initializers
     # -- all .rb files in that directory are automatically loaded.
 
-    config.middleware.insert_before 0, "Rack::Cors" do
-    allow do
-        origins '*'
-        resource '*', :headers => :any, :methods => [:get, :post, :put, :delete, :options]
-      end
-    end
     # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
     # Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
     # config.time_zone = 'Central Time (US & Canada)'
@@ -43,5 +37,7 @@ class Application < Rails::Application
       end
     end
     config.active_record.raise_in_transactional_callbacks = true
+    config.autoload_paths << Rails.root.join("app", "graph", "types")
+    config.autoload_paths << Rails.root.join("app", "graph", "mutations")
   end
 end

config/routes.rb

@@ -5,5 +5,10 @@
       post "/auth/login", to: "auth#login"
       get "/auth/logout", to: "auth#logout"
     end
+
+    namespace :v2 do
+      post "/queries", to:"graph#process_query"
+    end
   end
+  mount GraphiQL::Rails::Engine, at: "/graphiql", graphql_path: "/api/v2/queries"
 end

public/assets/.sprockets-manifest-572fa2fa576b655a47e6adbffa6cb2d9.json

@@ -0,0 +1 @@
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