Question

this.DataWorkspace.UserData.users = is a WCF Ria table that exposes the list of registered users

this.DataWorkspace.SHowroomData.Employees has a field where we have inserted the username from the above Ria table (http://traf-o-data.blogspot.com/2011/08/linking-lightswitch-data-to-logged-in.html)

I’m try to filter the customer records that are returned based on the store that the current user(employee) belongs to.

Here is the query and the error.

Thanks for any suggestions.

Answer 1

I don’t think, in PreprocessQuery() you can make a direct call on the datasource. You have to design your query without any “intermediate” results. Everything you need in that query has to be passed to the method as a parameter.

So either, 1) you pass the employee-data of the current user to the method or his ID using a screen property that contains this information and is linked to the query-parameter
or 2) try to include the currentuser – employee selection into the “query = ” line somehow, which should work, because stores and employees should have relation. You can address both, parent and child tables of any entity in LINQ to Entities.