python - QSqlRelationalDelegate 显示foreign_key - 相关记录的id，而不是组合框中的名称/值

标签 python pyqt pyqt5 pyqt6 qsqlrelationaltablemodel

我正在尝试向 QSqlRelationalModel 添加新行，该行在 QTableView 中表示。

我已经在模型中设置了正确的QSqlRelationalDelegate和正确的QSqlRelations。显示数据库中的现有数据效果很好。包含相关数据的列更改为组合框，我可以从相关表中选择选项。

但是，当我尝试通过向模型添加一行来创建新记录时，组合框允许我从下拉列表中选择正确的值，但选择后，该值将更改为相关记录的 ID，如下所示如果没有设置关系委托(delegate)。

ma​​in.py:


import sys

from PyQt6 import QtCore, QtWidgets
from PyQt6.QtCore import QModelIndex, Qt
from PyQt6.QtSql import QSqlDatabase, QSqlTableModel, QSqlRelationalTableModel, QSqlRelation, QSqlQuery, \
    QSqlRelationalDelegate
from PyQt6.QtWidgets import QPushButton

class Ui_main(object):
    def setupUi(self, main):
        main.setObjectName("main")
        main.resize(781, 652)

        self.verticalLayoutWidget = QtWidgets.QWidget(main)
        self.verticalLayoutWidget.setGeometry(QtCore.QRect(10, 10, 761, 631))
        self.verticalLayoutWidget.setObjectName("verticalLayoutWidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.verticalLayoutWidget)
        self.verticalLayout.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout.setObjectName("verticalLayout")

        # Replace values with your database configurations
        database = QSqlDatabase.addDatabase('QSQLITE')
        database.setDatabaseName('accounting.db')
        database.open()

        button_add = QPushButton("AddRow")
        button_add.clicked.connect(self.addRow)
        self.verticalLayout.addWidget(button_add)

        self.tableView = QtWidgets.QTableView(self.verticalLayoutWidget)
        self.tableView.setObjectName("tableView")
        self.tableView.verticalHeader().setVisible(False)
        self.verticalLayout.addWidget(self.tableView)

        self.table_model = QSqlRelationalTableModel(main, database)
        self.table_model.setJoinMode(QSqlRelationalTableModel.JoinMode.LeftJoin)
        self.table_model.setEditStrategy(QSqlTableModel.EditStrategy.OnFieldChange)

        self.table_model.setTable('book_of_accounts')

        self.table_model.setRelation(4, QSqlRelation('account_type', 'id', 'name'))
        self.table_model.setRelation(7, QSqlRelation('subconto1', 'id', 'name'))
        self.table_model.setRelation(8, QSqlRelation('subconto2', 'id', 'name'))
        self.table_model.setRelation(9, QSqlRelation('subconto3', 'id', 'name'))

        self.table_model.select()

        self.tableView.setModel(self.table_model)
        self.tableView.setItemDelegate(QSqlRelationalDelegate(self.tableView))
        self.tableView.hideColumn(0)
        QtCore.QMetaObject.connectSlotsByName(main)

    def addRow(self):
        self.tableView.sortByColumn(-1, Qt.SortOrder.AscendingOrder)
        count = self.table_model.rowCount(QModelIndex())
        self.table_model.insertRows(count, 1)
        self.tableView.scrollToBottom()

        self.tableView.updateGeometry()
        self.tableView.selectRow(count)


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    main_window = QtWidgets.QWidget()
    window = Ui_main()
    window.setupUi(main_window)
    main_window.show()
    sys.exit(app.exec())

数据库:


BEGIN TRANSACTION;
CREATE TABLE IF NOT EXISTS "book_of_accounts" (
    "id"    INTEGER PRIMARY KEY AUTOINCREMENT,
    "code"  varchar(4) NOT NULL,
    "belongs_to_id" bigint,
    "name"  varchar(1024) NOT NULL,
    "account_type_id"   bigint NOT NULL,
    "quantitative"  boolean NOT NULL,
    "monetary"  boolean NOT NULL,
    "subconto_1_id" bigint,
    "subconto_2_id" bigint,
    "subconto_3_id" bigint,
    CONSTRAINT "book_of_accounts_subconoto_3_id_fkey" FOREIGN KEY("subconto_3_id") REFERENCES "subconto3" on delete cascade,
    CONSTRAINT "book_of_accounts_subconoto_2_id_fkey" FOREIGN KEY("subconto_2_id") REFERENCES "subconto2" on delete cascade,
    CONSTRAINT "book_of_accounts_subconoto_1_id_fkey" FOREIGN KEY("subconto_1_id") REFERENCES "subconto1" on delete cascade,
    CONSTRAINT "book_of_accounts_account_type_id_fkey" FOREIGN KEY("account_type_id") REFERENCES "account_type",
    CONSTRAINT "book_of_accounts_belongs_to_id_fkey" FOREIGN KEY("belongs_to_id") REFERENCES "book_of_accounts"
);
CREATE TABLE IF NOT EXISTS "subconto3" (
    "id"    bigserial,
    "name"  varchar(1024) NOT NULL,
    CONSTRAINT "subconto3_pkey" PRIMARY KEY("id")
);
CREATE TABLE IF NOT EXISTS "subconto2" (
    "id"    bigserial,
    "name"  varchar(1024) NOT NULL,
    CONSTRAINT "subconto2_pkey" PRIMARY KEY("id")
);
CREATE TABLE IF NOT EXISTS "subconto1" (
    "id"    bigserial,
    "name"  varchar(1024) NOT NULL,
    CONSTRAINT "subconto1_pkey" PRIMARY KEY("id")
);
CREATE TABLE IF NOT EXISTS "account_type" (
    "id"    bigserial,
    "name"  varchar(1024) NOT NULL,
    CONSTRAINT "account_type_pkey" PRIMARY KEY("id")
);

INSERT INTO "subconto3" ("id","name") VALUES (1,'< Ничего >');
INSERT INTO "subconto3" ("id","name") VALUES (2,'Цены');
INSERT INTO "subconto3" ("id","name") VALUES (3,'Подразделения');
INSERT INTO "subconto2" ("id","name") VALUES (1,'< Ничего >');
INSERT INTO "subconto2" ("id","name") VALUES (2,'Места хранения');
INSERT INTO "subconto2" ("id","name") VALUES (3,'Статьи затрат');
INSERT INTO "subconto2" ("id","name") VALUES (4,'Договора');
INSERT INTO "subconto2" ("id","name") VALUES (5,'Виды налогооблагаемого дохода');
INSERT INTO "subconto2" ("id","name") VALUES (6,'Движение денежных средств');
INSERT INTO "subconto2" ("id","name") VALUES (7,'Виды выбытия');
INSERT INTO "subconto1" ("id","name") VALUES (1,'< Ничего >');
INSERT INTO "subconto1" ("id","name") VALUES (2,'Основные средства');
INSERT INTO "subconto1" ("id","name") VALUES (3,'Нематериальные активы');
INSERT INTO "subconto1" ("id","name") VALUES (4,'Товаро-материальные запасы');
INSERT INTO "subconto1" ("id","name") VALUES (5,'Статьи затрат');
INSERT INTO "subconto1" ("id","name") VALUES (6,'Расходы будущих периодов');
INSERT INTO "subconto1" ("id","name") VALUES (7,'Контрагенты');
INSERT INTO "subconto1" ("id","name") VALUES (8,'Сотрудники');
INSERT INTO "subconto1" ("id","name") VALUES (9,'Налоги и отчисления');
INSERT INTO "subconto1" ("id","name") VALUES (10,'Движение денежных средств');
INSERT INTO "subconto1" ("id","name") VALUES (11,'Расчетные счета наши');
INSERT INTO "subconto1" ("id","name") VALUES (12,'Контрагенты и Сотрудники');
INSERT INTO "account_type" ("id","name") VALUES (1,'Активный');
INSERT INTO "account_type" ("id","name") VALUES (2,'Забалансовый');
INSERT INTO "account_type" ("id","name") VALUES (3,'Контр. Активный');
INSERT INTO "account_type" ("id","name") VALUES (4,'Контр. Пассивный');
INSERT INTO "account_type" ("id","name") VALUES (5,'Пассивный');
INSERT INTO "account_type" ("id","name") VALUES (6,'Транзитный');

INSERT INTO "book_of_accounts" ("id","code","belongs_to_id","name","account_type_id","quantitative","monetary","subconto_1_id","subconto_2_id","subconto_3_id") VALUES (1,'0000',NULL,'Остатки',5,0,0,1,1,1);
INSERT INTO "book_of_accounts" ("id","code","belongs_to_id","name","account_type_id","quantitative","monetary","subconto_1_id","subconto_2_id","subconto_3_id") VALUES (2,'0100',NULL,'СЧЕТА УЧЕТА ОСНОВНЫХ СРЕДСТВ',3,0,0,2,2,1);
INSERT INTO "book_of_accounts" ("id","code","belongs_to_id","name","account_type_id","quantitative","monetary","subconto_1_id","subconto_2_id","subconto_3_id") VALUES (3,'0110',2,'Земля',3,0,0,2,2,1);
INSERT INTO "book_of_accounts" ("id","code","belongs_to_id","name","account_type_id","quantitative","monetary","subconto_1_id","subconto_2_id","subconto_3_id") VALUES (4,'0111',2,'Благоустройство земли',1,0,0,2,2,1);
INSERT INTO "book_of_accounts" ("id","code","belongs_to_id","name","account_type_id","quantitative","monetary","subconto_1_id","subconto_2_id","subconto_3_id") VALUES (5,'0112',2,'Благоустройство основных средств, полученных по договору долгосрочной аренды',1,0,0,2,2,1);

CREATE UNIQUE INDEX IF NOT EXISTS "bookofaccounts_code" ON "book_of_accounts" (
    "code"
);
CREATE INDEX IF NOT EXISTS "bookofaccounts_belongs_to_id" ON "book_of_accounts" (
    "belongs_to_id"
);
CREATE INDEX IF NOT EXISTS "bookofaccounts_name" ON "book_of_accounts" (
    "name"
);
CREATE INDEX IF NOT EXISTS "bookofaccounts_account_type_id" ON "book_of_accounts" (
    "account_type_id"
);
CREATE INDEX IF NOT EXISTS "bookofaccounts_subconoto_1_id" ON "book_of_accounts" (
    "subconto_1_id"
);
CREATE INDEX IF NOT EXISTS "bookofaccounts_subconoto_2_id" ON "book_of_accounts" (
    "subconto_2_id"
);
CREATE INDEX IF NOT EXISTS "bookofaccounts_subconoto_3_id" ON "book_of_accounts" (
    "subconto_3_id"
);
CREATE INDEX IF NOT EXISTS "subconto3_name" ON "subconto3" (
    "name"
);
CREATE INDEX IF NOT EXISTS "subconto2_name" ON "subconto2" (
    "name"
);
CREATE INDEX IF NOT EXISTS "subconto1_name" ON "subconto1" (
    "name"
);
CREATE INDEX IF NOT EXISTS "accounttype_name" ON "account_type" (
    "name"
);
COMMIT;

此问题可能与 unanswered 6-years-old so question 有关.

最佳答案

看起来这个问题是由于使用 EditStrategy.OnFieldChange 引起的。

在 documentation它说的是

To prevent inserting only partly initialized rows into the database, OnFieldChange will behave like OnRowChange for newly inserted rows

但看起来此行为并不完整，并且该行的“无效”状态仍然阻止查找相关字段。您会注意到，一旦该行完成并写入，它实际上就可以正常工作。

如果将编辑策略切换为 EditStrategy.OnRowChange，它将按预期工作。

self.table_model.setEditStrategy(QSqlTableModel.EditStrategy.OnRowChange)

下面是正在进行的编辑，我已退出第四列下拉列表。它继续显示相关字段查找的值。

Image showing related field lookup working using OnRowChange edit strategy

关于python - QSqlRelationalDelegate 显示foreign_key - 相关记录的id，而不是组合框中的名称/值，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/68634621/

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