type Model interface {
	// A getter for the Model's Id.
	Id() string
	// Datastore will set the Id().
	SetId(string)
	// Return the name of the collection, sometimes known as a table name.
	Table() string
	// A method to convert an interface to this model type.
	Convert(interface{})
	// Return nil if the model passes all validation.
	Validate() error
	// Define what it means to be equal.
	// This usually starts with a type conversion.
	Equal(interface{}) bool
}

type Datastore interface {
        // Save the model and set the Id.
        Save(Model) error
        // Return the model with the given Id.
        Get(string, Model) (interface{}, error)
        // Get a collection of models where the field name matches the value passed in.
        Filter(string, interface{}, Model) ([]interface{}, error)
        // Test for model existence in the datastore.
        Exists(Model) bool
}