production:
adapter: postgresql
encoding: unicode
pool: <%= ENV.fetch("RAILS_MAX_THREADS") {5} %>
url: <%= ENV['DATABASE_URL'] %># ...
group :development, :test do
# ...
gem 'sqlite3', '~> 1.3.6'
end
# ...
group :production do
gem 'pg'
end
# ...bundle install
git add .
git commit -m "Preparing for Heroku deploy"
heroku apps:create <YOUR_APP_NAME>
heroku addons:create heroku-postgresql:hobby-dev
git push heroku master
heroku run rails db:migraterails new PROJECT_NAME
cd PROJECT_NAME
# test if server is working
rails s- #<LoadError: Error loading the 'sqlite3' Active Record adapter. Missing a gem it depends on? can't activate sqlite3 (~> 1.3.6), already activated sqlite3-1.4.0. Make sure all dependencies are added to Gemfile.>
gem 'sqlite3', '~> 1.3.6'Rails.application.routes.draw do
root 'courses#index'
endclass CoursesController < ApplicationController
def index
end
end<h1>Courses index</h1>gem 'materialize-sass', '~> 1.0.0'
gem 'material_icons'
gem 'jquery-rails'get 'courses/new', to: 'courses#new'
get 'about', to: 'pages#about'rails routes
Prefix Verb URI Pattern Controller#Action
root GET / courses#index
courses_new GET /courses/new(.:format) courses#new
about GET /about(.:format) pages#about
rails_service_blob GET /rails/active_storage/blobs/:signed_id/*filename(.:format) active_storage/blobs#show
rails_blob_representation GET /rails/active_storage/representations/:signed_blob_id/:variation_key/*filename(.:format) active_storage/representations#show
rails_disk_service GET /rails/active_storage/disk/:encoded_key/*filename(.:format) active_storage/disk#show
update_rails_disk_service PUT /rails/active_storage/disk/:encoded_token(.:format) active_storage/disk#update
rails_direct_uploads POST /rails/active_storage/direct_uploads(.:format) active_storage/direct_uploads#create <%= link_to 'Home', root_path %>
<%= link_to 'About', about_path %>
<%= link_to 'Add Course', courses_new_path %># generate a migration file
rails generate migration create_coursesclass CreateCourses < ActiveRecord::Migration[5.2]
def change
create_table :courses do |t|
t.string :short_name
t.string :name
t.text :description
t.timestamps
end
end
end# Run Migration
rails db:migrate<!DOCTYPE html>
<html>
<head>
<title>UnivApp</title>
<%= csrf_meta_tags %>
<%= csp_meta_tag %>
<%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
<%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>
</head>
<body>
<%= render 'layouts/navigation' %>
<main>
<div class="container">
<%= yield %>
</div>
</main>
<%= render 'layouts/footer' %>
</body>
</html>class User < ApplicationRecord
# active record callback
before_save { self.email = email.downcase }
# has_many relationship
has_many :articles, dependent: :destroy
# uniqueness validation
validates :username, presence: true, uniqueness: { case_sensitive: false },
length: { minimum: 3, maximum: 25 }
# email validation
VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
validates :email, presence: true, length: { maximum: 105 },
uniqueness: { case_sensitive: false },
format: { with: VALID_EMAIL_REGEX }
# Secure password
has_secure_password
end<div class="container">
<div class="row center sign-up-form">
<div class="col s12 m12 l12">
<div class="card-panel">
<h3 class="header">Sign up !</h3>
<div class="row">
<%= form_for(@student, html: {class: "col s12"}) do |f| %>
<div class="row">
<div class="input-field col s12">
<%= f.text_field :name, placeholder: "Enter your full name", autofocus: true %>
<%= f.label :name %>
</div>
</div>
<div class="row">
<div class="input-field col s12">
<%= f.text_field :email, placeholder: "Enter your email address" %>
<%= f.label :email %>
</div>
</div>
<div class="row">
<div class="input-field col s12">
<%= f.submit "Sign up", class: "btn orange waves-effect waves-light right" %>
</div>
</div>
<% end %>
</div>
</div>
</div>
</div>
</div> def create
@student = Student.new(student_params)
if @student.save
flash[:success] = "You have successfully signed up"
redirect_to root_path
else
render 'new'
end
end
private
def student_params
params.require(:student).permit(:name, :email)
end$('#fade-out-target').fadeOut(4000);flash[:notice] = "You have successfully signed up"# Add to config/environment.rb
ActionView::Base.field_error_proc = Proc.new do |html_tag, instance_tag|
html_tag
end<% if @student.errors.any? %>
<div class="container">
<div class="row sign-up-form">
<div class="col s12 m12 l12">
<div class="card-panel red lighten-1">
<span class="white-text">
<strong><%= pluralize(@student.errors.count, "error") %>
prohibited your profile from being created: </strong>
<ul>
<% @student.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</span>
</div>
</div>
</div>
</div>
<% end %> <% flash.each do |key, message| %>
<div class="container">
<div class="row sign-up-form">
<div class="col s12 m12 l12">
<div class="card-panel green lighten-1" id="fade-out-target">
<span class="white-text">
<%= message %>
</span>
</div>
</div>
</div>
</div>
<% end %>class StudentsController < ApplicationController
before_action :set_student, only: [:show, :edit, :update]
# ...
private
def set_student
@student = Student.find(params[:id])
end
end<%= @student.new_record? ? "created" : "updated" %>
<%= f.submit(@student.new_record? ? "Sign up" : "Update" , class: "btn orange waves-effect waves-light right") %><%= render 'shared/errors', obj: @student %><% if obj.errors.any? %>
<div class="container">
<div class="row sign-up-form">
<div class="col s12 m12 l12">
<div class="card-panel red lighten-1">
<span class="white-text">
<strong><%= pluralize(obj.errors.count, "error") %>
prohibited your profile from being <%= obj.new_record? ? "created" : "updated" %>: </strong>
<ul>
<% obj.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</span>
</div>
</div>
</div>
</div>
<% end %>class Student < ApplicationRecord
#...
has_secure_password
endgem 'bcrypt', '~> 3.1.7'bundle install
rails generate migration add_password_digest_to_studentsclass AddPasswordDigestToStudents < ActiveRecord::Migration[5.2]
def change
add_column :students, :password_digest, :string
end
end