code: def field_cols(model):
          
  
          to_many = model.to_many
          cols = [f for f in model.all_fields if f not in to_many]
          cols = ', '.join(cols)
  
          return cols or None
docs: Get the models columns in a friendly SQL format
  
          This will be a string of comma separated field
          names prefixed by the models resource type.
  
          TIP: to_manys are not located on the table in Postgres
               & are instead application references, so any reference
               to there column names should be pruned!
  
          :return: str