Suppose I have an Artists table and a Paintings table with the usual setup
of the Artist class having a PAINTINGS_ARRAY property. Suppose further that
the painting has a "color" property that can be a string or null.
How would I build an Expression such that I get back the Artists that have
either no paintings or only paintings with a specific color value (or a null
color value)?
I am using Cayenne 2.0.4 in case that matters.
TIA
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