Node JS Sequelize sql 关联

Question

所以仍在尝试弄清楚如何使用关联和使用 sequelize。我正在尝试关联具有多个团队的游戏。

游戏：

"use strict"
module.exports = (sequelize, DataTypes) => {
    var game =  sequelize.define('game', {
            gameId: {
                type: DataTypes.INTEGER,
                primaryKey: true,
                autoIncrement: true
            },
            awayTeam: {
                type: DataTypes.INTEGER,
                references: {
                    model: "team",
                    key: 'teamId',
                },
                allowNull: false
            },
            homeTeam: {
                type: DataTypes.INTEGER,
                references: {
                    model: "team",
                    key: 'teamId',
                },
                allowNull: false
            },
            awayTeamScore: {
                type: DataTypes.INTEGER,
                allowNull: false
            },
            homeTeamScore: {
                type: DataTypes.INTEGER,
                allowNull: false
            },
        },
        {
            timestamps: false,
            tableName: 'game',
                associate: function (models) {
                /// trying to figure this out
            }
        }
    );
    return game;
};

团队：

"use strict"
module.exports = (sequelize, DataTypes) => {
    var team = sequelize.define('team', {
            teamId: {
                type: DataTypes.INTEGER,
                primaryKey: true,
                autoIncrement: true
            },
            name: {
                type: DataTypes.STRING,
                allowNull: false
            },
            city: {
                type: DataTypes.STRING,
                allowNull: false
            }
        },
        {
            timestamps: false,
            tableName: 'team',
            associate: function(models){
                /// trying to figure this out
            }
        }
    );

    return team;
};

会是 team belongsToMany games 和 games hasMany teams？

Answer 1

你需要在associate()类方法中使用hasMany()函数。

游戏：

"use strict";

var game = {};
var classmethods = {};

module.exports = (sequelize, DataTypes) => {
    game =  sequelize.define('game', {
            gameId: {
                type: DataTypes.INTEGER,
                primaryKey: true,
                autoIncrement: true
            },
            awayTeam: {
                type: DataTypes.INTEGER,
                references: {
                    model: "team",
                    key: 'teamId',
                },
                allowNull: false
            },
            homeTeam: {
                type: DataTypes.INTEGER,
                references: {
                    model: "team",
                    key: 'teamId',
                },
                allowNull: false
            },
            awayTeamScore: {
                type: DataTypes.INTEGER,
                allowNull: false
            },
            homeTeamScore: {
                type: DataTypes.INTEGER,
                allowNull: false
            },
        },
        {
            timestamps: false,
            classmethods: classmethods
        }
    );
    return game;
};

classmethods.associate = function (models) {
  game.hasMany(models.team, {foreignKey: 'teamId'});
};

为此，您还需要以这种方式设置 Sequelize： https://github.com/jklepatch/kangaroojs/blob/master/apps/web/models/index.js

如果您还希望能够使用团队模型中的关联，则需要在团队模型中使用'belongsTo()`

"use strict";

var team;
var classmethods;

module.exports = (sequelize, DataTypes) => {
    team = sequelize.define('team', {
            teamId: {
                type: DataTypes.INTEGER,
                primaryKey: true,
                autoIncrement: true
            },
            name: {
                type: DataTypes.STRING,
                allowNull: false
            },
            city: {
                type: DataTypes.STRING,
                allowNull: false
            }
        },
        {
            timestamps: false,
            tableName: 'team',
            classmethods: classmethods
        }
    );

    return team;
};

classmethods.associate = function (models) {
  game.belongsTo(models.game);
};

Answer 2

这是我在 sequelize 中使用关联的代码。

game.js

import DataTypes from 'sequelize';

    const game =  sequelize.define('game', {
            gameId: {
                type: DataTypes.INTEGER,
                primaryKey: true,
                autoIncrement: true
            },
            awayTeam: {
                type: DataTypes.INTEGER,
                references: {
                    model: "team",
                    key: 'teamId',
                },
                allowNull: false
            },
            homeTeam: {
                type: DataTypes.INTEGER,
                references: {
                    model: "team",
                    key: 'teamId',
                },
                allowNull: false
            },
            awayTeamScore: {
                type: DataTypes.INTEGER,
                allowNull: false
            },
            homeTeamScore: {
                type: DataTypes.INTEGER,
                allowNull: false
            },
        },
        {   
            tablenName: 'game'
            timestamps: false,
            freezeTableName: true;

});

module.exports = game;

team.js

import DataTypes from 'sequelize';

const team = sequelize.define('team', {
            teamId: {
                type: DataTypes.INTEGER,
                primaryKey: true,
                autoIncrement: true
            },
            name: {
                type: DataTypes.STRING,
                allowNull: false
            },
            city: {
                type: DataTypes.STRING,
                allowNull: false
            }
        },
        {

            tableName: 'team',
            freezeTableName: true,
            timestamps: false,
});

module.exports = team;

//index.js（关联）

import game from '../models/game';
import team from '../models/team';

game.belongsTo(team, {foreignKey: 'awayTeam', targetKey: 'teamId'});
game.belongsTo(team, {foreignKey: 'homeTeam', targetKey: 'teamId'});