Sequelize 和 Graphql 反向查找

Question

我有两个模特：

River.associate = models => {
  River.hasMany(models.Fish, { as: 'Fishes' });
};

Fish.associate = models => {
  Fish.belongsTo(models.River);
};

type River {
    id: ID!
    name: String!
    alternative: String!
    geojson: JSON
    fishes: [Fish]
}

type Fish {
  id: ID!
  name: String!
}

如何在给定鱼 ID 列表的情况下找到所有河流？ 我不确定查询必须如何查找 graphql 和 sequelize？

type Query {
  river(id: ID!): River
  **rivers(fishIds: ARRAY): River ??????**
  fishes: [Fish]
}

Query: {
rivers: (_, { fishIds }) => {
      return River.findAll({
        where: {
          fishes: fishIds
        }
      });
    },
}

Answer 1

您可以为包含的每个模型指定 WHERE 子句。此外，这样做会将急切加载转换为内部连接（这是您想要的），除非您将 required 参数显式设置为 false.

这意味着您应该能够执行以下操作：

River.findAll({ include:
  [
    {
      model: Fish,
      where: { id: fishIds }
    },
  ],
})

Sequelize 和 Graphql 反向查找

Sequelize and Graphql reverse lookup

express

sequelize.js

graphql

apollo-server