[RUBY] [Rails] Prepare dummy data to be used for testing [Faker]


When testing with RSpec etc., data may be prepared in advance with FactoryBot etc., but at that time I will write about how to use Faker that creates random data nicely.


Just install the gem.


group :development, :test do
  gem 'faker'


$ bundle install

How to use

You can enter Faker :: [genre]. [Title etc.] in the rb file. Please check Official Reference to see what is available.

Samples are lined up in the README, so just click on the one you want to use and use it as shown in the link. 278199070c4abe565b7f1ecb13ca831c.png

It's hard to understand unless you try it, so I'll actually use it. This time I would like to use Movies. Click Movies in the README to jump to the Movies section on the same page as shown below. 25cbc0c934fbfedd13009afd6e7fb9ff.png This time we will use Faker :: movie. Click Faker :: movie to jump to the details page. 9c862c81313fa7018403ab0fb7212a8e.png If you write it exactly as it is written on this page, it will get the data at random. Let's try to get the movie title with Faker :: Movie.title.

Check on the console.


$ rails c

You will get it like this.

It is interesting because there are data such as Pokemon and Star Wars. 3b3af87aaeeec64d399f9f9819055435.png b03d65bc4ae23c1a32f8c04b8bf6266e.png

How to use with FacrotyBot

When using FactoryBot, you can write as below.


FactoryBot.define do

  factory :book do
    title     { Faker::Book.title }
    author    { Faker::Book.author }
    publisher { Faker::Book.publisher }


Similarly, if you use a seed file, you can randomly create various initial data.

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