NameError: uninitialized constant Faker

Question

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.

Solution 1

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

Solution 2

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

Comments

[ptd]

Do you have the faker gem?

[user1072337]

I have the faker gem under my gemfile in group :test do

[ptd]

Were you running rake db:seed in the test environment? Assuming you are running it in development, you need to add it to your development group as well.

[user1072337]

ok that worked; sorry for the waste of time.

[jerhinesmith]

It's not a waste of time if you learned something. Might be worthwhile to add your own answer at the bottom saying something like rake db:seed runs in the development environment. If you're using Faker in your seeds, make sure it's in both the development and test groups.

[BenKoshy]

in the individual tests spec file or in the rails_helper.rb file?

[Touré Holder]

yup... :face_palm:

[Ali Ammaar]

I had to use require 'faker' in rails console in development environment, thanks