Question

Check for existance of related object in Microflow expression

5

In a microflow I want to check if a related object exists or not. So a pizza might or might not have a related image. I tried: if $Pizza/PizzaMarco.Pizza_Image = empty then ... else ... But this check returns true all the time. How can I check if such object exists?

asked 2009-09-02

Hendrik van Antwerpen

3 answers

Hendrik van Antwerpen · Answer 1 · 2009-09-02

I accidently fixed my own problem. Because Auto create was enabled in my form, an empty image was created if I didn't provide one. Code above works like a charm.

Benny van Reeven · Answer 2 · 2009-09-02

The expression that you specified should work the way you describe. Could you explain the structure of your metamodel, and show the complete expression that you use?

Hendrik van Antwerpen · Answer 3 · 2009-09-02

Ok, the more complete version this time.

In my Metamodel I have two objects: Pizza( String:PizzaName, Currency:PizzaPrice, Boolean:HasImage, System.Image:&Pizza_Image )

HasBoolean is a virtual atrribute, with a microflow 'PizzaHasImage'. I want to show this attribute in a datagrid column.

The Microflow is as follows: Inputs: Pizza:InputPizzaObject 1 Activity: Een Variable.Create action, Datatype=Boolean, Name=HasImage, Code:

$InputPizzaObject/PizzaMario_1.Pizza_Image != empty

Thw microflow returntype is a Boolean, returning $HasImage.