Java Reference
In-Depth Information
the method is the attribute name. The
blank
constraint implies, naturally enough, that the
name of the product can't be an empty string. The
price
constraint sets a minimum value
of 0, and the
d
makes it a double, because the constraint type must match the attribute data
type.
11
The lizard creature that Captain Kirk fought in the
Star Trek
original series episode “Arena” was a Gorn, not a
GORM. I mean, who ever heard of Grails Object-Relational Napping, anyway? (Though there's probably a “lazy
loading” joke in there somewhere.)
This application will have three more domain classes, representing customers, orders, and
lines on the orders. Next up is the
Customer
class, shown in the next listing.
Listing 8.11. The
Customer
class. Customers have many orders (hopefully).
Customers have a
name
attribute and a
Set
representing their orders.
Grails hasmany
In Grails the
hasMany
property implies a one-to-many relationship. By default, the con-
tained objects form a set.
The
name
cannot be blank. The
Order
class is shown in the following listing.
