The signature of the function passed to @foreach.
Be cautious if you plan on modifying the rows in the model via the DeeModelIters you find. Your code may have to be reentrant since the index
may change in reaction to the changes in the model. It's not impossible to do this in a non-broken manner, but it may likely require you calling
dee_model_thaw_signals at strategic points.
A key in the index being traversed
A ResultSet. Do not free or modify.
The pointer passed to @foreach