如何解决：编译SELECT查询时检测到未定义的绑定

Question

我试图获取所有与具有特定类别产品相关的具有相关功能的功能键，但收到以下所述的错误。我做错了什么？

我的表结构：

Product:
id -> int
category_id -> int (one-to-many)

FeatureProducts: (many-to-many)
id -> int
product_id -> int
feature_id -> int

Feature:
id -> int
value -> string
featurekey_id -> int (one-to-many)

FeatureKeys:
id -> int
type -> string
name -> string
text -> string

Product.query((qb) => {
      qb.where('category_id', '=', params.category);
    })
      .belongsToMany(Featurekey)
      .through(Feature)
      .fetch({
        withRelated: filters.populate || populate,
      });

Error: Undefined binding(s) detected when compiling SELECT query: select `featurekey`.*, `feature`.`id` as `_pivot_id`, `feature`.`product_id` as `_pivot_product_id`, `feature`.`featurekey_id` as `_pivot_featurekey_id` from `featurekey` inner join `feature` on `feature`.`featurekey_id` = `featurekey`.`id` where `feature`.`product_id` = ?

Answer 1

尝试更改您的代码

it()

代替此：

Product.query((qb) => {
      qb.where('category_id', req.params.category);
    })
      .belongsToMany(Featurekey)
      .through(Feature)
      .fetch({
        withRelated: filters.populate || populate,
      });