Add model Post

app/models/post.rb

@@ -0,0 +1,5 @@
+class Post < ApplicationRecord
+  belongs_to :profile
+
+  validates :text, length: { maximum: 200 }
+end

app/models/profile.rb

@@ -1,2 +1,3 @@
 class Profile < ApplicationRecord
+  has_many :posts
 end

db/migrate/20210310092955_create_posts.rb

@@ -0,0 +1,9 @@
+class CreatePosts < ActiveRecord::Migration[6.1]
+  def change
+    create_table :posts do |t|
+      t.timestamps
+      t.references :profile, null: false, foreign_key: true
+      t.string :text, null: false
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,15 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2021_03_10_092513) do
+ActiveRecord::Schema.define(version: 2021_03_10_092955) do
+
+  create_table "posts", force: :cascade do |t|
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+    t.integer "profile_id", null: false
+    t.string "text", null: false
+    t.index ["profile_id"], name: "index_posts_on_profile_id"
+  end
 
   create_table "profiles", force: :cascade do |t|
     t.datetime "created_at", precision: 6, null: false
@@ -20,4 +28,5 @@ ActiveRecord::Schema.define(version: 2021_03_10_092513) do
     t.string "description"
   end
 
+  add_foreign_key "posts", "profiles"
 end

test/fixtures/posts.yml

@@ -0,0 +1,9 @@
+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  profile: one
+  text: Hello, World!
+
+two:
+  profile: two
+  text: OMG this is a real microblog!

test/models/post_test.rb

@@ -0,0 +1,7 @@
+require "test_helper"
+
+class PostTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end