Question

我正在尝试在findAll表上执行简单的Statue操作。但是，findAll操作也会遍历所有关联的模型，这不是我的预期行为。

我的雕像关联模型建立起来，

statue.associate = function(models) {
  const { comment, image, like } = models;

  statue.hasMany(comment, {
    foreignKey: 'model_id',
    constraints: false,
    scope: {
      model_name: 'statue'
    }
  });

  statue.hasMany(image, {
    foreignKey: 'model_id',
    constraints: false,
    scope: {
      model_name: 'statue'
    }
  });

  statue.hasMany(like, {
    foreignKey: 'model_id',
    constraints: false,
    scope: {
      model_name: 'statue'
    }
  });
};

我跑步时：

const statues = await Statue.findAll();

我取回了我想要的雕像对象，并按预期看到了此postgres命令行输出。

SELECT "id", "title", "artist_desc", "artist_name", "artist_url", "statue_desc", "location", "created_at", "updated_at" FROM "statues" AS "statue";

但我也看到了，

SELECT "id", "user_id", "text", "model_name", "model_id", "created_at", "updated_at" FROM "comments" AS "comment" WHERE "comment"."model_name" = 'statue' AND "comment"."model_id" = 1;
SELECT "id", "model_name", "model_id", "url", "height", "width", "created_at", "updated_at" FROM "images" AS "image" WHERE "image"."model_name" = 'statue' AND "image"."model_id" = 1;
SELECT "id", "user_id", "model_name", "model_id", "created_at", "updated_at" FROM "likes" AS "like" WHERE "like"."model_name" = 'statue' AND "like"."model_id" = 1;

是相关模型，但随后我收到的输出便是

return res.json(statues);

是{}。

任何方向都将非常有帮助。我对Postgres＆Express非常陌生。

要补充一点，我确实希望所有这些相关模型都在返回的响应中，但目前甚至连雕像模型的响应都被吞噬了……

Answer 1

要包括相关模型，可以使用eager loading

const statues = await Statue.findAll({include: [image]});

您还可以包括所有关联的模型，而无需单独指定它们

Statue.findAll({ include: [{ all: true }]});

从输出角度看，请记录statues的值，并检查DB中是否有值。

序列化关联模型查询

1 个答案: