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Add chapter about prefixes #25

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Add chapter about prefixes #25

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23 changes: 23 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -149,6 +149,29 @@ enum :roles, [:noob, :author, :editor], :multiple => true, :default => [:author,
enum :roles, [:noob, :author, :editor], :multiple => true, :default => [] # no default
```

## Custom field name

By default enum field name is prefixed with underscore ('_')
```ruby
enum :roles, [:noob, :author, :editor], :multiple => true, :default => [:author, :editor] # two defaults
> User.new.attributes
=> {"_id"=>BSON::ObjectId('549d746563616c2168060000'), "_roles" => [:author, :editor] }
```

It's important to be aware of prefix when using scopes/queries

`User.where(_roles: '[:author, :editor]'`

You can customize prefix with:

```ruby
Mongoid::Enum.configure do |config|
config.field_name_prefix = ''
end
```

Recommended to put inside `config/initializers/mongoid.rb`

## Validations

Validations are baked in by default, and ensure that the value(s) set in
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