CODEWITHSUNDEEP
ruby-on-railsrubyruby-on-rails-4rspecruby-on-rails-5
user1072337
user1072337

Reputation: 12945

NameError: uninitialized constant Faker

I am trying to run a simple bundle exec rake db:seed for my database in Rails 4. However, when running it, I get the following output: 

********-C02MGBVJFD57:myapp ***********$ bundle exec rake db:seed
Your Gemfile lists the gem factory_girl_rails (>= 0) more than once.
You should probably keep only one of them.
While it's not a problem now, it could cause errors if you change the version of just one of them later.
rake aborted!
NameError: uninitialized constant Faker
/Users/**********/workspace/myapp/db/seeds.rb:16:in `block in <top (required)>'
/Users/**********/workspace/myapp/db/seeds.rb:15:in `times'
/Users/**********/workspace/myapp/db/seeds.rb:15:in `<top (required)>'
/Users/**********/.rvm/gems/ruby-2.1.2@myapp/gems/railties-4.1.4/lib/rails/engine.rb:543:in `load_seed'
/Users/**********/.rvm/gems/ruby-2.1.2@myapp/gems/activerecord-4.1.4/lib/active_record/tasks/database_tasks.rb:184:in `load_seed'
/Users/**********/.rvm/gems/ruby-2.1.2@myapp/gems/activerecord-4.1.4/lib/active_record/railties/databases.rake:173:in `block (2 levels) in <top (required)>'
Tasks: TOP => db:seed
(See full trace by running task with --trace)

Here is my seeds.rb file:

User.create!(
  name:                  "Example User",
  email:                 "[email protected]",
  password:              "foobar",
  password_confirmation: "foobar",
  admin:                 true
)

99.times do |n|
  name     = Faker::Name.name
  email    = "example-#{n+1}@railstutorial.org"
  password = "password"
  User.create!(
    name:                  name,
    email:                 email,
    password:              password,
    password_confirmation: password
  )
end

Line 16 is:

name = Faker::Name.name

Any ideas why I am getting this error? Thank you.

Upvotes: 26

Views: 21774

Answers (4)

Yuriy
Yuriy

Reputation: 63

As per official faker documentation, it said:

Note: if you are getting a uninitialized constant Faker::[some_class] error, your version of the gem is behind the one documented here. To make sure that your gem is the one documented here, change the line in your Gemfile to:

gem 'faker', :git => 'https://github.com/faker-ruby/faker.git', :branch => 'main'

But the problem still persist with mine app, since I have done this and I am getting the error again, but only when try to run the migrations to heroku:

heroku run rails db:migrate db:seed

When I run the command locally I do not have the problem and migrations and seeds are executed.

Upvotes: 0

Kelvin Mwaura
Kelvin Mwaura

Reputation: 3

I added gem 'faker' in the Gemfile. Then I run bundle install to get the gem.

Upvotes: 0

Vbp
Vbp

Reputation: 1962

I faced the same issue while writing rspec and adding require 'faker' in spec file solved it.

Upvotes: 8

Andrey Deineko
Andrey Deineko

Reputation: 52357

Just faced similar issue - I was running

rails g model model_name

and getting the error:

uninitialized constant Faker (NameError)

Problem was due to fact, that I had gem added to test group.

Placing it into development and test group solved the problem:

group :development, :test do
  # ...
  gem 'faker'
  # ...
end

Upvotes: 52

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