lithium\data\Source::relationship()
Defines or modifies the default settings of a relationship between two models.
Parameters
- 
							$class
							theprimary model of the relationship 
- 
							$type
							thetype of the relationship (hasMany, hasOne, belongsTo) 
- 
							$name
							thename of the relationship 
- 
							array
							$optionsrelationship options 
Returns
arrayReturns an array containing the configuration for a model relationship.
Source
	abstract public function relationship($class, $type, $name, array $options = array());