Faker
Faker is a Perl's Data::Faker library. It’s a library that generates fake data like names, addresses, and phone numbers. While developing, Faker can help you generate realistic test data and populate your database with more than a couple of records.
Table of contents
How to install faker
Reminder:
Make sure that your containers are up and running.
In your gemfile, add gem faker. Given that we will only use faker for development and test environment, we will put it inside development and test group.
gem 'faker'
Then run bundle install.
root@0122:/usr/src/app# bundle install
Fetching gem metadata from https://rubygems.org/..........
Resolving dependencies...
...
Installing faker 3.0.0
Bundle complete! 15 Gemfile dependencies, 67 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.
Usage
Here are some examples of how Faker can be used:
irb(main):001:0> Faker::Internet.email
=> "sheron.white@gusikowski.net"
irb(main):002:0> Faker::Name.name
=> "Marvin Nitzsche"
irb(main):003:0> Faker::Address.full_address
=> "Suite 872 750 Kassie Well, West Thomasena, SD 17945-2959"
irb(main):004:0> Faker::Lorem.sentence
=> "Unde doloremque sequi magnam."
irb(main):005:0> Faker::Lorem.paragraph
=> "Deserunt fugiat ex. Et at ipsum. Ipsam magnam rerum."
Let’s try and apply it in our seed.
- Create Users
- Create 30 Posts
# db/seeds.rb
- # This file should contain all the record creation needed to seed the database with its default values.
- # The data can then be loaded with the bin/rails db:seed command (or created alongside the database with db:setup).
- #
- # Examples:
- #
- # movies = Movie.create([{ name: "Star Wars" }, { name: "Lord of the Rings" }])
- # Character.create(name: "Luke", movie: movies.first)
+ 10.times do
+ user = User.create!(email: Faker::Internet.email, password: 'qwer4321', password_confirmation: "qwer4321")
+ puts "create user id: #{user.id}, email: #{user.email}"
+ end
+
+ 30.times do |i|
+ puts "start create #{i} post"
+ post = Post.create(title: Faker::Lorem.sentence, content: Faker::Lorem.paragraph, user: User.all.sample)
+ (1..20).to_a.sample.times do
+ Comment.create(content: Faker::Lorem.sentence, user: User.all.sample, post: post)
+ end
+ puts "finish #{i} post"
+ end
Then run the seed on your project.
root@0122:/usr/src/app# rails db:seed
create user id: 1, email: reyna.robel@waters.name
...
create user id: 10, email: dyan.schmidt@walsh.io
start create 0 post
finish 0 post
...
start create 29 post
finish 29 post
Now we already integrated the faker in our application.