[英]Laravel groupBy using Carbon - unexpectedly limiting grouped array length
[英]Using groupby in sequelize to get an array of the grouped items
我正在使用sequelize
(4.42.0)和express。 我有兩個表categories
和main_categories
具有以下關聯:
db.main_categories.hasMany(db.categories);
db.categories.belongsTo(db.main_categories);
我嘗試使用以下sequelize命令獲取在其主要類別下分組的所有類別的列表:
var _categoryList = await models.main_categories.findAll({include: [{model: models.categories}], group:['main_categories.id']});
res.send({category_list: _categoryList});
上述續集代碼的輸出是:
{
"category_list": [
{
"id": 1,
"name": "Physics",
"created_at": null,
"updated_at": null,
"categories": [
{
"id": 1,
"name": "Mechanics",
"created_at": "2019-03-21T03:39:48.000Z",
"updated_at": "2019-03-21T03:39:48.000Z",
"main_category_id": 1
}
]
},
{
"id": 2,
"name": "Chemistry",
"created_at": null,
"updated_at": null,
"categories": [
{
"id": 6,
"name": "General and Physical Chemistry",
"created_at": "2019-03-21T03:42:54.000Z",
"updated_at": "2019-03-21T03:42:54.000Z",
"main_category_id": 2
}
]
},
{
"id": 3,
"name": "Zoology",
"created_at": null,
"updated_at": null,
"categories": []
},
{
"id": 4,
"name": "Botany",
"created_at": null,
"updated_at": null,
"categories": []
}
]
}
我的預期輸出是每個main_category中的categories數組將包含屬於同一主類別的所有類別的詳細信息,而不是上面輸出中顯示的一個類別。
所以我后來發現,由於已經聲明了關聯,我們只需要包含沒有任何groupby子句的模型。 所以對我有用的最終代碼是:
var _categoryList = await models.main_categories.findAll({include: [{model: models.categories}]});
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