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[Back to Guides](../README.md)
The ActiveModelSerializers grape formatter relies on the existence of `env['grape.request']` which is implemeted by `Grape::Middleware::Globals`. You can meet his dependency by calling it before mounting the endpoints.
In the simpliest way:
```
class API < Grape::API
# @note Make sure this is above you're first +mount+
use Grape::Middleware::Globals
end
```
or more like what is shown in current Grape tutorials:
```
module MyApi
class ApiBase < Grape::API
use Grape::Middleware::Globals
require 'grape/active_model_serializers'
include Grape::ActiveModelSerializers
mount MyApi::V1::ApiBase
end
end
```
You could meet this dependency with your own middleware. The invocation might look like:
```
module MyApi
class ApiBase < Grape::API
use My::Middleware::Thingamabob
require 'grape/active_model_serializers'
include Grape::ActiveModelSerializers
mount MyApi::V1::ApiBase
end
end
```
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