#modifie the QSqlQueryModel to be editable and sets them to the database

#credits to :
#https://stackoverflow.com/questions/49752388/editable-qtableview-of-complex-sql-query


class SqlQueryModel_editable(QSqlQueryModel):
    """a subclass of QSqlQueryModel where individual columns can be defined as editable
    """
    def __init__(self, editables):
        """editables should be a dict of format: 
        {INT editable_column_nr : (STR update query to be performed when changes are made on this column
                                   INT model's column number for the filter-column (used in the where-clause),
                                   )} 
        """
        super().__init__()
        self.editables = editables

    def flags(self, index):
        fl = QSqlQueryModel.flags(self, index)
        if index.column() in self.editables:
            fl |= Qt.ItemIsEditable
        return fl

    def setData(self, index, value, role=Qt.EditRole):
        if role == Qt.EditRole:
            mycolumn = index.column()
            if mycolumn in self.editables:
                (query, filter_col) = self.editables[mycolumn]
                filter_value = self.index(index.row(), filter_col).data()
                q = QSqlQuery(query.format(value, filter_value))
                result = q.exec_()
                if result:
                    self.query().exec_()
                else:
                    print(self.query().lastError().text())
                return result
        return QSqlQueryModel.setData(self, index, value, role)