docs: 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