Add model TelegramChat

app/models/telegram_chat.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+class TelegramChat < ApplicationRecord
+  CHAT_TYPES = %w[private group supergroup channel].freeze
+
+  validates :remote_id, presence: true, uniqueness: true
+  validates :chat_type, presence: true, inclusion: { in: CHAT_TYPES }
+end

db/migrate/20181207030332_create_telegram_chats.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class CreateTelegramChats < ActiveRecord::Migration[5.2]
+  def change
+    create_table :telegram_chats do |t|
+      t.timestamps null: false
+
+      t.integer :remote_id, null: false, index: { unique: true }
+      t.string  :chat_type, null: false
+
+      t.string :title
+      t.string :username
+      t.string :first_name
+      t.string :last_name
+    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: 2018_12_07_002553) do
+ActiveRecord::Schema.define(version: 2018_12_07_030332) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -136,6 +136,18 @@ ActiveRecord::Schema.define(version: 2018_12_07_002553) do
     t.string "username"
   end
 
+  create_table "telegram_chats", force: :cascade do |t|
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.integer "remote_id", null: false
+    t.string "chat_type", null: false
+    t.string "title"
+    t.string "username"
+    t.string "first_name"
+    t.string "last_name"
+    t.index ["remote_id"], name: "index_telegram_chats_on_remote_id", unique: true
+  end
+
   create_table "user_omniauths", force: :cascade do |t|
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false

factories/telegram_chats.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :telegram_chat do
+    remote_id { rand(-100_000_000..100_000_000) }
+    chat_type { TelegramChat::CHAT_TYPES.sample }
+
+    title      { Faker::Lorem.sentence }
+    username   { Faker::Internet.username }
+    first_name { Faker::Name.first_name }
+    last_name  { Faker::Name.last_name }
+  end
+end

spec/models/telegram_chat_spec.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe TelegramChat do
+  subject { create :telegram_chat }
+
+  it { is_expected.to validate_presence_of :remote_id }
+  it { is_expected.to validate_presence_of :chat_type }
+
+  it { is_expected.not_to validate_presence_of :title }
+  it { is_expected.not_to validate_presence_of :username }
+  it { is_expected.not_to validate_presence_of :first_name }
+  it { is_expected.not_to validate_presence_of :last_name }
+
+  it { is_expected.to validate_uniqueness_of :remote_id }
+
+  it do
+    is_expected.to \
+      validate_inclusion_of(:chat_type)
+      .in_array(%w[private group supergroup channel])
+  end
+end