app/controllers/sessions_controller.rb

@@ -3,7 +3,7 @@ class SessionsController < ApplicationController
   end
 
   def create
-    @user = User.find_by(username: params[:username])
+    @user = User.find_by(email: params[:email])
     if @user && @user.authenticate(params[:password])
       session[:user_id] = @user.id
     end

app/controllers/users_controller.rb

@@ -4,7 +4,7 @@ class UsersController < ApplicationController
   end
 
   def create
-    @user = User.create(params.require(:user).permit(:username, :password))
+    @user = User.create(params.require(:user).permit(:email, :password))
     session[:user_id] = @user.id
     redirect_to '/welcome'
   end

app/views/sessions/new.html.erb

@@ -1,7 +1,7 @@
 <h1>Login</h1>
   <%= form_tag '/login' do %>
-  <%= label_tag :username%>
-  <%= text_field_tag :username %>
+  <%= label_tag :email%>
+  <%= text_field_tag :email %>
   <%= label_tag :password%>
   <%= password_field_tag :password%>
   <%= submit_tag "Login"%>

app/views/sessions/welcome.html.erb

@@ -1,6 +1,6 @@
 <h1>Welcome</h1>
 <% if logged_in? %>
-  <h1>You are Logged In, <%= current_user.username %></h1>
+  <h1>You are Logged In, <%= current_user.email %></h1>
   <%= button_to "Logout", '/logout', method: :get%>
 <%else%>
   <%= button_to "Login", '/login', method: :get%>

app/views/users/new.html.erb

@@ -1,7 +1,7 @@
 <h1>Sign Up</h1>
 <%= form_for @user do |f|%>
-  <%= f.label :username%><br>
-  <%= f.text_field :username%><br>
+  <%= f.label :email%><br>
+  <%= f.text_field :email%><br>
   <%= f.label :password%><br>
   <%= f.password_field :password%><br>
   <%= f.submit %>

db/migrate/20210320212922_change_username_to_email.rb

@@ -0,0 +1,5 @@
+class ChangeUsernameToEmail < ActiveRecord::Migration[6.1]
+  def change
+    rename_column :users, :username, :email
+  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: 2021_03_20_130542) do
+ActiveRecord::Schema.define(version: 2021_03_20_212922) do
 
   create_table "authors", force: :cascade do |t|
     t.string "first_name"
@@ -39,7 +39,7 @@ ActiveRecord::Schema.define(version: 2021_03_20_130542) do
   end
 
   create_table "users", force: :cascade do |t|
-    t.string "username"
+    t.string "email"
     t.string "password_digest"
     t.datetime "created_at", precision: 6, null: false
     t.datetime "updated_at", precision: 6, null: false

spec/controllers/application_controller_spec.rb

@@ -3,12 +3,12 @@ require 'rails_helper'
 RSpec.describe ApplicationController do
   describe 'current_user' do
     before(:all) do
-      User.create(username: 'karol.selak@gmail.com', password: 'abcde')
+      User.create(email: 'karol.selak@gmail.com', password: 'abcde')
     end
     context 'when a user is logged in' do
       it 'returns the user' do
         # TODO
-        # expect(current_user.username).to eql('karol.selak@gmail.com')
+        # expect(current_user.email).to eql('karol.selak@gmail.com')
       end
     end
   end

spec/controllers/users_controller_spec.rb

@@ -12,11 +12,11 @@ RSpec.describe UsersController do
       User.destroy_all
     end
     subject {
-      get :create, params: {user: {username: 'karol.selak@gmail.com', password: 'abcde'}}
+      get :create, params: {user: {email: 'karol.selak@gmail.com', password: 'abcde'}}
     }
     it 'creates a user' do
       subject
-      expect(User.where(username: 'karol.selak@gmail.com').size).to eql(1)
+      expect(User.where(email: 'karol.selak@gmail.com').size).to eql(1)
     end
     it 'redirects to /welcome' do
       subject