add roles controller

app/controllers/v1/roles_controller.rb

+class V1::RolesController < ApplicationController
+  before_action :authenticate_user!, except: [:index, :show]
+  before_action :set_role, only: [:show, :update, :destroy]
+
+  # GET /roles
+  # GET /roles.json
+  def index
+    render json: Role.all
+  end
+
+  # GET /roles/1
+  # GET /roles/1.json
+  def show
+    render json: @role
+  end
+
+  # POST /roles
+  # POST /roles.json
+  def create
+    @role = Role.new(role_params)
+
+    if @role.save
+      render json: @role, status: :created
+    else
+      render json: @role.errors, status: :unprocessable_entity
+    end
+  end
+
+  # PATCH/PUT /roles/1
+  # PATCH/PUT /roles/1.json
+  def update
+    if @role.update(role_params)
+      render json: @role, status: :ok
+    else
+      render json: @role.errors, status: :unprocessable_entity
+    end
+  end
+
+  # DELETE /roles/1
+  # DELETE /roles/1.json
+  def destroy
+    @role.destroy
+    render nothing: true, status: :ok
+  end
+
+  private
+
+  # Use callbacks to share common setup or constraints between actions.
+  def set_role
+    @role = Role.find(params[:id])
+  end
+
+  # Never trust parameters from the scary internet, only allow the white list through.
+  def role_params
+    params.require(:role).permit(:name, :description)
+  end
+end

app/models/role.rb

@@ -23,7 +23,11 @@ class Role < ActiveRecord::Base
     self.find_by_name('teacher') || self.create!(name: 'teacher')
   end
 
-  def self.curator
+  def self.student
     self.find_by_name('student') || self.create!(name: 'student')
   end
+
+  def self.curator
+    self.find_by_name('curator') || self.create!(name: 'curator')
+  end
 end

app/policies/role_policy.rb

+class RolePolicy < ApplicationPolicy
+  def index?
+    record
+  end
+
+  def show?
+    record
+  end
+
+  def create?
+    record if user.is_admin?
+  end
+
+  def update?
+    record if user.is_admin?
+  end
+
+  def destroy?
+    record if user.is_admin?
+  end
+end

app/serializers/role_serializer.rb

+class RoleSerializer < ActiveModel::Serializer
+  attributes :id, :name, :description
+end

config/routes.rb

@@ -60,6 +60,7 @@ Rails.application.routes.draw do
     resources :mime_types, except: [:new, :edit]
     resources :languages, except: [:new, :edit]
     resources :complaints, only: [:index, :create]
+    resources :roles, except: [:new, :edit]
 
     post '/package', to: 'packages#link'
   end

db/seeds.rb

@@ -6,6 +6,7 @@
 #   cities = City.create([{ name: 'Chicago' }, { name: 'Copenhagen' }])
 #   Mayor.create(name: 'Emanuel', city: cities.first)
 Role.create(name: 'teacher', description: 'This role represents a Teacher in Portal MEC.')
+Role.create(name: 'student', description: 'This role represents a Student in Portal MEC.')
 Role.create(name: 'admin', description: 'This role represents an MEC Admin, that can perform any action.')
 Role.create(name: 'curator', description: 'This role represents a content Curator in Portal MEC.')