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---
layout: default
title: Destroying Factories
parent: Usage
nav_order: 9
---
## A Cautionary Tale
If you think you want to do this, you are probably wrong. This will not only de-register the factory from Faker Maker, but also delete the class definition from the interpreter. While it's cool that Ruby allows this, it's almost certainly going to hurt.
This functionality exists for experimenting with factories in REPLs.
Seriously, don't use this in anger.
# Destroying Factories
Faker Maker deliberately does not allow you to redefine a factory by redeclaring it. It will also be silent about your attempt to do so. This is to avoid throwing up runtime warning from the Ruby interpreter if you are embedding one factory definition in another.
For example, this might give you unexpected behavior:
```ruby
FakerMaker.factory :user do
name {'Patsy Stone'}
end
FakerMaker.factory :user do
name {'Patsy Stone'}
email {'patsy@fabulous.co.uk'}
end
FM[:user].as_json
=> {:name=>"Patsy Stone"}
```
On the other hand, sometimes you really, really want to destroy a factory and start again (especially if you are experimenting in a REPL for example). FakerMaker allows you to shut a factory which will de-register it from the list of available factories and attempt to unload the class it has built from the Ruby interpreter.
```ruby
FakerMaker.factory :user do
name {'Patsy Stone'}
end
FakerMaker.shut!(:user)
FakerMaker.factory :user do
name {'Patsy Stone'}
email {'patsy@fabulous.co.uk'}
end
FM[:user].as_json
=> {:name=>"Patsy Stone", :email=>"patsy@fabulous.co.uk"}
```
It also provides the `shut_all!` method to remove all factories.
Version data entries
9 entries across 9 versions & 1 rubygems