AssociationProxy fields don't have a property value
AssociationProxy fields don't have a property value

Instead, pass through to the real field on the remote table, so it can be checked for whether or not this is a date value.

jkatzer/flask-restless,dnordberg/flask-restless,jfinkels/flask-restless,donovan-graham/flask-restless,dan-compton/flask-restless,donovan-graham/flask-restless,jwg4/flask-restless,dnordberg/flask-restless,mayuroks/flask-restless,victorliun/flask-restless,donovan-graham/flask-restless,emilyemorehouse/flask-restless,jkatzer/flask-restless,iceone/flask-restless,dan-compton/flask-restless,CommonsCloud/CommonsRestless,jkatzer/flask-restless,ternaris/flask-restless,ternaris/flask-restless,ternaris/flask-restless,iceone/flask-restless,quiqua/flask-restless,dan-compton/flask-restless