rest - grails 3 overriding queryForResource not working -

according grails web services

i can override method queryforresource. way may able specify nested rest resource. e.g

"/authors"(resources:'author') {     "/books"(resources:'book') } 

but doc may wrong. because uses assigment operator = instead comparison 1 ==.

running way following error:

((id == id) && building.id) binary expression, should variable expression 

changing operator = == error

cannot query property "params" - no such property on class clash.buildinglevel exists 

what correct way define nested rest resource?

here queryforresource method:

i tried both:

@override protected buildinglevel queryforresource(serializable id) {     if (params.buildingid) {         return buildinglevel.where {             id == id && building.id = params.buildingid         }.find()     } }   @override protected buildinglevel queryforresource(serializable id) {     if (params.buildingid) {         return buildinglevel.where {             id == id && building.id == params.buildingid         }.find()     } } 

i figure out.

the following post issues-posting-nested-resource-in-grails helped me.

the params cannot inside where clause. it's necessary create local variable keep value. this:

@override protected buildinglevel queryforresource(serializable id) {     def mylocalvariablebuildingid = params.buildingid     if (params.buildingid) {         return buildinglevel.where {             id == id && building.id == mylocalvariablebuildingid         }.find()     } }