Creates a new editor for the given parent and operator.
        
        :param      parent      | <QWidget>
                    operator    | <str>
                    value       | <variant>

def createEditor(self, parent, column, operator, value):
        """
        Creates a new editor for the given parent and operator.
        
        :param      parent      | <QWidget>
                    operator    | <str>
                    value       | <variant>
        """
        editor = super(ForeignKeyPlugin, self).createEditor(parent,
                                                            column,
                                                            operator,
                                                            value)
        
        if editor is not None:
            editor.setRequired(column.required())
            editor.setMinimumWidth(150)
            
            model = column.referenceModel()
            if model:
                text = model.schema().displayName().lower()
                editor.setHint('any {0}'.format(text))
                
                editor.setRecords(model.select())
                if operator in ('is in', 'is not in'):
                    editor.setCheckable(True)
        
        return editor