Prepopulating edit form

Question

I have the following case: 
 - Milestone-like interface for editing CDT (e.g. employee) in which first step is selecting one existing record from database:

- Based on that selection, I try to save expression rule result rule!EEDM_GetEmployeeById(ri!selectedEmployee ) into rule input ri!employee when click NEXT button (part of my NEXT button code is given below): 
 a!buttonWidget( label: "Next", value: local!activeStep + 1, saveInto: { local!activeStep, a!save( ri!employee, if( local!activeStep = 2, rule!EEDM_GetEmployeeById( ri!selectedEmployee ), ri!employee ) )... 
 - Values should then be prepopulated in edit form as my rule input ri!employee has values

Problem is I keep getting this error: 
 
 However, it seems that my categoryIcon field in ri!employee is correctly saved:

What is the cause?

Mike Schmitt · Accepted Answer

You shouldn't need to do that typecasting within the query expression rule - I've found it's only very rarely necessary, personally. I don't see any way in which any of your initial issues were caused by that. Since your button is saving it directly into the rule input which I assume is already cast to the CDT type, the casting would occur there anyway in this case. 
 For the category icon - I'm not sure what's going on there but your image field definitely needs to handle the case of a null category icon, which it currently isn't. On that note - you showed a screenshot of (i assume) " ri!categoryIcon ", but your code is referencing ri!employee.categoryIcon - so i'm confused as to which one you intend to actually use.

Prepopulating edit form

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