Question

I have the following piece of code in ItemController.groovy

def list = {
    params.max = 60
    def storeYYId = params.id

        [itemInstanceList: Item.list(params), itemInstanceTotal: Item.count()]
}

I have the following in Item.groovy:

class Item {
    String itemName
    static belongsTo = [store:Store]


    static constraints = {
        itemName(blank:false)
        storeId()
    }
}

This gives me an error since it tells me that there is no storeId property, but there is, since store_id is a foreign key to the Store table in the corresponding database.

Question1. How do I tell grails to let me access the properties of domains that are autogenerated by GORM, like the id and storeId in this case?

Question2. What code should I write in my ItemController.groovy in my list action, in order to retrieve only a list of items where the storeId == storeYYId ?

Answer 1

Question1. How do I tell grails to let me access the properties of
domains that are autogenerated by GORM, like the id and storeId in
this case?

You should be able to access autogenerated properties in exactly the same way as you access properties that you define. The reason you’re getting an error is because Grails does not automatically generate a storeId property for the Item class, the only properties it will autogenerate are version and id (for both Item and Store).

Question2. What code should I write in my ItemController.groovy in my
list action, in order to retrieve only a list of items where the
storeId == storeYYId ?

You’ll need to write either a HQL or criteria query to retrieve these items. The criteria query would look something like this (untested)

// Get all items that have storeId = 6
def storeId = 6

def items = Item.withCriteria {
    store {
        eq('id', storeId)
    }
}