Srinivas Guthula's Blog

Criteria class allows performing complex searches on grails objects. There are number of shortcut methods for performing queries but these methods have limitations in terms of number of conditions used in "where clauses". Traditional sql "joins" are not possible as shown in some of the Grails "Finder" methods shown below. Sample 1: def list = AccountTransaction.findAllByCompanyCodeAndVoucherDateBetween(branch, fromDate, toDate, params) Sample 2: def list = AccountTransaction.findAllByCompanyCodeAndVoucherDateGreaterThanEquals(branch, fromDate, params) Sample 3: def list = AccountTransaction.findAllByCompanyCodeAndTransGroup(branch, group, params) "params" contains attributes related to sorting, paging etc. It is very easy to use finder methods but when you want to filter objects by more conditions we need to look for alternatives. For understanding the relationships used in this sample, I listed the grails domain classes. class TransactionTyp...

The "list" pages generated by inbuilt scaffolding/template features of grails have pagination and sorting features. However, if the domain object displayed in the list is a nested object having another domain object as a property, you may notice that sort is not enabled for that field. Boiler plate code for the header of the list is shown below. As you would have noticed few columns have sortable columns automatically generated by Grails command, generate-all or generate-views. The properties 'partyAccount' and 'bankAccount' in this sample are domain classes nested in the domain class 'partyTransaction'. We could convert them to sortable columns by using the tag g:sortableColum...