system/classes/Model.php
public function getFieldName($attributeName)
    {
        if (isset($this->model_attributes[$attributeName]['field'])) {
            return $this->model_attributes[$attributeName]['field'];
        }
        return $attributeName;
    }
public function getFieldName($attributeName)
    {
        if (isset($this->model_attributes[$attributeName]['field'])) {
            return $this->model_attributes[$attributeName]['field'];
        }
        return $attributeName;
    }
By default, an attribute is stored in a DB field with matching name.
So lastModified would be stored in a column named lastModified.
However, there may be situations where a developer wants the attribute name
in the model to be different than the DB. I.E. lastModified => last_modified.

This method, when given an attribute on the model, should read the model definition
and return the field name in the DB.