Add tags

These will be used by both BlogPost and Micropost

app/models/tag.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class Tag < ApplicationRecord
+  validates :name, presence: true
+end

db/migrate/20231019164620_create_tags.rb

@@ -0,0 +1,9 @@
+class CreateTags < ActiveRecord::Migration[7.1]
+  def change
+    create_table :tags do |t|
+      t.string :name, null: false
+
+      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[7.1].define(version: 2023_10_06_070935) do
+ActiveRecord::Schema[7.1].define(version: 2023_10_19_164620) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -70,6 +70,12 @@ ActiveRecord::Schema[7.1].define(version: 2023_10_06_070935) do
     t.index ["user_id"], name: "index_microposts_on_user_id"
   end
 
+  create_table "tags", force: :cascade do |t|
+    t.string "name", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
   create_table "users", force: :cascade do |t|
     t.string "username", null: false
     t.string "password_digest", null: false

test/fixtures/tags.yml

@@ -0,0 +1,2 @@
+sql:
+  name: sql

test/models/tag_test.rb

@@ -0,0 +1,13 @@
+require "test_helper"
+
+class TagTest < ActiveSupport::TestCase
+  setup do
+    @tag = tags(:sql)
+    assert @tag.valid?
+  end
+
+  test "must have a name" do
+    @tag.name = nil
+    assert_not @tag.valid?
+  end
+end