Following DRY is at the heart of grails. While saving domain objects in our project, we used to copy the domain class constraints to the Command Objects (pretty ugly as it is), until we found that we can import constraints directly from the domain classses using importFrom() method in Grails 2.0
\n[java]
\nclass VenueCO {
\n String name
\n String description
\n Integer someExtraField<\/p>\n
String addressLine1
\n String addressLine2
\n String city
\n String state
\n String zip<\/p>\n
static constraints = {
\n importFrom Venue
\n importFrom GeographicAddress<\/p>\n
someExtraField(nullable: false)
\n }
\n}
\n[\/java]<\/p>\n
Not only does it import all the constraints from the User and GeographicAddress domain classes and apply them to our command object, but also ignores the constraints that don’t have corresponding properties in the command object.<\/p>\n
Other variations of the importFrom() are:
\n[java]
\nimportFrom User, include: ["lastName"]
\nimportFrom User, include: [\/.*Name\/] \/\/ imports all constraints that ended with ‘Name’
\n[\/java]<\/p>\n
Note: It works for grails 2 and above. For others there is a similar concept of shared constraints.<\/p>\n
Cheers.
\nImran Mir
\nimran[at]intelligrape[dot]com<\/p>\n","protected":false},"excerpt":{"rendered":"
Following DRY is at the heart of grails. While saving domain objects in our project, we used to copy the domain class constraints to the Command Objects (pretty ugly as it is), until we found that we can import constraints directly from the domain classses using importFrom() method in Grails 2.0 [java] class VenueCO { […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":6,"footnotes":""},"categories":[7],"tags":[784,783,746,782],"class_list":["post-5257","post","type-post","status-publish","format-standard","hentry","category-grails","tag-domain-constraints-reusability","tag-following-dry-principles","tag-grails-2-0","tag-import-domain-constraints"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t