Introduce Glitch::Note (#193)

This is a model for attaching a single note to a single other entity.
For #193, we'll use it for annotating blocks, mutes, and account-level
domain blocks.

app/models/glitch/note.rb

@@ -0,0 +1,15 @@
+# == Schema Information
+#
+# Table name: glitch_notes
+#
+#  id          :integer          not null, primary key
+#  target_id   :integer          not null
+#  target_type :string           not null
+#  note        :text             not null
+#  created_at  :datetime         not null
+#  updated_at  :datetime         not null
+#
+
+class Glitch::Note < ApplicationRecord
+  belongs_to :target, polymorphic: true
+end

db/migrate/20180118192721_create_glitch_notes.rb

@@ -0,0 +1,11 @@
+class CreateGlitchNotes < ActiveRecord::Migration[5.1]
+  def change
+    create_table :glitch_notes do |t|
+      t.bigint :target_id, null: false
+      t.string :target_type, null: false
+      t.text :note, null: false
+      t.index [:target_id, :target_type]
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20180106000232) do
+ActiveRecord::Schema.define(version: 20180118192721) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -182,6 +182,15 @@ ActiveRecord::Schema.define(version: 20180106000232) do
     t.index ["account_id"], name: "index_glitch_keyword_mutes_on_account_id"
   end
 
+  create_table "glitch_notes", force: :cascade do |t|
+    t.bigint "target_id", null: false
+    t.string "target_type", null: false
+    t.text "note", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["target_id", "target_type"], name: "index_glitch_notes_on_target_id_and_target_type"
+  end
+
   create_table "imports", force: :cascade do |t|
     t.integer "type", null: false
     t.boolean "approved", default: false, null: false

spec/fabricators/glitch_note_fabricator.rb

@@ -0,0 +1,2 @@
+Fabricator('Glitch::Note') do
+end

spec/models/glitch/note_spec.rb

@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe Glitch::Note, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end