Question

我正在制作一个按照以下方式过滤查询的功能：

class Foos(tag: Tag) extends RichTable[Foo](tag, "t_foo") {
    // foo slick mapping
}

工作职能

object Foos extends PostgresGeneric[Foos, Foo] {
    private def filterQuery(query :Query[Foos,Foos#TableElementType,Seq], searchFilter: FooFilter) = {
        var filteredQuery = query

        if(searchFilter.searchEntity.isDefined) {
          val searchEntity = searchFilter.searchEntity.get

          if(searchEntity.cancelled.isDefined) {
            filteredQuery = filteredQuery.filter(p => p.cancelled === searchEntity.cancelled.get)
          }

          if(searchEntity.nome.isDefined) {
            filteredQuery = filteredQuery.filter(p => p.nome.toLowerCase like "%"+searchEntity.nome.get.toLowerCase()+"%")
          }

          if(searchEntity.localidade.isDefined) {
            filteredQuery = filteredQuery.filter(_.localidade === searchEntity.localidade)
          }
        }

        filteredQuery
    }
}

无效功能

object Foos extends PostgresGeneric[Foos, Foo] {
    private def filterQuery(query :Query[Foos,Foos#TableElementType,Seq], searchFilter: FooFilter) = {
        var filteredQuery = query

        if(searchFilter.searchEntity.isDefined) {
          val searchEntity = searchFilter.searchEntity.get

          if(searchEntity.cancelled.isDefined) {
            filteredQuery = filteredQuery.filter(p => p.cancelled === searchEntity.cancelled.get)
          }

          if(searchEntity.nome.isDefined) {
            filteredQuery = filteredQuery.filter(p => p.nome.toLowerCase like "%"+searchEntity.nome.get.toLowerCase()+"%")
          }

          if(searchEntity.localidade.isDefined) {
            filteredQuery = filteredQuery.filter(_.localidade === searchEntity.localidade)
            filteredQuery = filteredQuery.join(tableReferenceFoo2).on(_.foo2 === _.id)
          }
        }

        filteredQuery
    }
}

错误消息

Error:(165, 76) type mismatch;
 found   : scala.slick.lifted.Query[(model.db.entity.Foos, model.db.entity.Foos2),(model.db.entity.Foo, model.db.entity.Foos2#TableElementType),Seq]
    (which expands to)  scala.slick.lifted.Query[(model.db.entity.Foos, model.db.entity.Foos2),(model.db.entity.Foo, model.db.entity.Foo2),Seq]
 required: slick.driver.PostgresDriver.simple.Query[model.db.entity.Foos,model.db.entity.Foo,Seq]
    (which expands to)  scala.slick.lifted.Query[model.db.entity.Foos,model.db.entity.Foo,Seq]
        filteredQuery = filteredQuery.join(tableReferenceFoo2).on(_.Foo2 === _.id)

第一个代码有效，因为生成的查询在过滤后总是具有相同的类型。它在连接后失败，因为类型改变了。

Porblem：

此函数正常工作，直到我需要与另一个表执行连接。

那么，我如何以一种接受可以挂载任何类型查询的类型的方式键入此Query实例？有可能吗？

Slick Generic Query返回类型

0 个答案: