add migrations and seeds

app/models/educational_stage.rb

+class EducationalStage < ApplicationRecord
+end

app/models/subject.rb

+class Subject < ApplicationRecord
+end

db/migrate/20161024160053_create_subjects.rb

+class CreateSubjects < ActiveRecord::Migration[5.0]
+  def change
+    create_table :subjects do |t|
+      t.string :name
+
+      t.timestamps null: false
+    end
+    add_index :subjects, :name, unique: true
+  end
+end

db/migrate/20161024160126_create_educational_stages.rb

+class CreateEducationalStages < ActiveRecord::Migration[5.0]
+  def change
+    create_table :educational_stages do |t|
+      t.string :name
+
+      t.timestamps null:false
+    end
+    add_index :educational_stages,:name, unique: true
+  end
+end

db/seeds.rb

@@ -26,3 +26,5 @@ require_relative 'seeds/licenses'
 require_relative 'seeds/object_types'
 require_relative 'seeds/ratings'
 require_relative 'seeds/scores'
+require_relative 'seeds/subjects'
+require_relative 'seeds/educational_stages'

db/seeds/educational_stages.rb

+EducationalStage.create(name: 'Educação Infatil')
+EducationalStage.create(name: 'Ensino Fundamental')
+EducationalStage.create(name: 'Ensino Médio')
+EducationalStage.create(name: 'Outros')
+

db/seeds/subjects.rb

+Subject.create(name:'Arte')
+Subject.create(name:'Língua Portuguesa')
+Subject.create(name:'Biologia')
+Subject.create(name:'Ciências da Natureza')
+Subject.create(name:'Educação Especial')
+Subject.create(name:'Educação Física')
+Subject.create(name:'Educação Indígena')
+Subject.create(name:'Espanhol')
+Subject.create(name:'Filosofia')
+Subject.create(name:'Física')
+Subject.create(name:'Geografia')
+Subject.create(name:'História')
+Subject.create(name:'Inglês')
+Subject.create(name:'Matemática')
+Subject.create(name:'Português')
+Subject.create(name:'Química')
+Subject.create(name:'Sociologia')

test/fixtures/create_educational_stages.yml

+# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  name: MyString
+
+two:
+  name: MyString

test/fixtures/subjects.yml

+# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  name: MyString
+
+two:
+  name: MyString

test/models/create_educational_stage_test.rb

+require 'test_helper'
+
+class CreateEducationalStageTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end

test/models/subject_test.rb

+require 'test_helper'
+
+class SubjectTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end