Manipulating data fields with different array structure in model callback methods

I am trying to look for a generic way to manipulate model data, say, in
beforeValidate in model. The model data could be in different array
structure (or shape). For example, the field to be validated can be in the
following 5 cases (and possibly more):

array['ModelName'][0]['field']
array[0]['ModelName'][field']
array['ModelName']['field']
array['ParentModelName']['ModelName']['field']
array['ParentModelName'][0]['ModelName']['field']

Is there a generic "cake" way to handle this, or I have to make a if-else
condition to go through all the possible scenarios case by case?

Thanks!
--Lapinski

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