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Update docs to require full namespace #1669

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Update docs to require full namespace #1669

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20 changes: 20 additions & 0 deletions GETTING_STARTED.md
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Expand Up @@ -219,6 +219,26 @@ It is also possible to explicitly specify the class:
factory :admin, class: "User"
```

Explicit specification of the class, _with the full namespace_, is necessary when defining factories for classes within modules in non-Rails applications:

```
# foo/bar.rb
module Foo
class Bar
...
end
end

# factories.rb
FactoryBot.define do
factory :bar, class: 'Foo::Bar' do
...
end
end
```

If the full namespace is not provided in the `factory` statement, you will receive a `NameError: uninitialized constant Bar` error.

You can pass a constant as well, if the constant is available (note that this
can cause test performance problems in large Rails applications, since
referring to the constant will cause it to be eagerly loaded).
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