Question

我有两个模型，policyTable和policy_rule定义如下。 policy_id中有一个名为policy_rule的列，它是外键并引用id中的policyTable列。 policy_rule可以有多个policyTable，即存在1：N的关系。

var policyTable = dbController.db.define('policyTable', {
    id: {
        type: Sequelize.BIGINT,
        autoIncrement: true,
        primaryKey: true
    },
    't': {
        type: Sequelize.BIGINT,
        unique: true
    },
    'name': {
        type: Sequelize.STRING,
    },
    src: {
        type: Sequelize.STRING
    }
}, {
    timestamps: false,
    freezeTableName: true,
    tableName: 'zo_policy',
});

var policy_rule = dbController.db.define('policy_rule', {
    policy_id: {
        type: Sequelize.BIGINT,
        references: {
            model: policyTable,
            key: 'id'
        },
        onUpdate: 'cascade',
        onDelete: 'cascade'
    },
    agent_id: {
        type: Sequelize.BIGINT,
    },
    enabled: {
        type: Sequelize.BOOLEAN,
    }
}, {
    timestamps: false,
    freezeTableName: true,
    tableName: 'zo_policy_rule',
});

现在我想加入这两个模型并获取它们的所有列。我怎样才能做到这一点？我尝试了以下代码，但它说

错误：policy_rule与policyTable没有关联！

function getAllPolicies() {
    return policyTable.findAndCountAll({
        include: [{
            model: policy_rule
            }]
    }).then(function (users) {
        console.log(users);
        data.count = users.count;
        data.users = users.rows;
        console.log(data);
        return data;
    });
};

Answer 1

即使您的关联是在数据库级别定义的，并且您在列定义中指明了这一点，但要使用sequelize的include功能，您仍需要明确定义模型之间的关联。

这里是doco中的相关部分：http://docs.sequelizejs.com/en/latest/docs/associations/#belongsto 和 http://docs.sequelizejs.com/en/latest/docs/associations/#1m

在您的情况下，它意味着将代码调整为下面的内容 - 请注意每个模型定义中的新classMethods部分：

var policyTable = dbController.db.define('policyTable', {
    id: {
        type: Sequelize.BIGINT,
        autoIncrement: true,
        primaryKey: true
    },
    't': {
        type: Sequelize.BIGINT,
        unique: true
    },
    'name': {
        type: Sequelize.STRING,
    },
    src: {
        type: Sequelize.STRING
    }
}, {
    timestamps: false,
    freezeTableName: true,
    tableName: 'zo_policy',
    classMethods: {
      associate(models) {
        this.hasMany(models.policy_rule, {foreignKey: 'policy_id'})
      }
    }
});

var policy_rule = dbController.db.define('policy_rule', {
    policy_id: {
        type: Sequelize.BIGINT,
        references: {
            model: policyTable,
            key: 'id'
        },
        onUpdate: 'cascade',
        onDelete: 'cascade'
    },
    agent_id: {
        type: Sequelize.BIGINT,
    },
    enabled: {
        type: Sequelize.BOOLEAN,
    }
}, {
    timestamps: false,
    freezeTableName: true,
    tableName: 'zo_policy_rule',
    classMethods: {
      associate(models) {
        this.belongsTo(models.policyTable, {foreignKey: 'policy_id'})
      }
    }
});

Sequelize简单的内部联接

1 个答案: