{消息：“确保调用 fetch 来执行查询”但我在 adonis / mode.js 中使用分页

Question

在查询生成器的文档中，说在查询后我必须创建一个.fetch() 或 .paginate() 但在这种情况下我收到：

{message: "确保调用 fetch 来执行查询"

我尝试了什么：

 async show({request}){

     const { page, pageSize } = request.get();
     const filter = request.input('filter')

     const bIds = await BookUnit
                         .query()
                         .where('book_id', request.params.id)
                         .ids() 

     const questions = await Question
                             .query()
                             .whereIn('book_unit_id', bIds)
                             .with('book_unit')


     //Filtros
     if(filter){
         if(filter.search("description") !== -1){
             let description = filter.match(/(?<=description~contains~').*?(?=')/)
             questions.where('description', 'ilike', '%'+description[0]+'%')
         }
         if(filter.search('unit') !== -1){
             let unit = filter.match(/(?<=unit~contains~').*?(?=')/)
             questions.where('unit', '=', unit[0])
         }
     }

     return await questions.paginate(page,pageSize)

我的模型：

class Book extends Model {

    book_units() {
        return this.hasMany("App/Models/BookUnit").select(
          "id",
          "description as unit"
        );
      }

      book_unit_questions() {
        return this.manyThrough("App/Models/BookUnit", "book_unit_questions");
      }

      user () {
        return this.belongsTo('App/Models/User')
            .select('id', 'username')
    }

}

class BookUnit extends Model {

    static get table () {
        return 'book_unit'
    }

    book_unit_questions() {
        return this.hasMany('App/Models/BookUnitQuestion')
    }


    user () {
        return this.belongsTo('App/Models/User')
            .select('id', 'username')
    }

}

class BookUnitQuestion extends Model {

    static get table () {
        return 'book_unit_question'
    }

    user () {
        return this.belongsTo('App/Models/User')
            .select('id', 'username')
    }

    book_unit(){
        return this.belongsTo('App/Models/BookUnit')
            .select('id','description', 'sequence', 'unit')
    }

    book(){
        return this.belongsTo('App/Models/Book')
    }

    book_unit_questions() {
        return this.belongsTo('App/Models/BookUnit')
    }

}

抱歉，我无法发布我的迁移，因为我收到消息“看起来您的帖子主要是代码；请添加更多详细信息”，如果您可以创建聊天，我可以发送

@编辑：

我试过了：

    async show({ request }){

        const { page, pageSize } = request.get();
        const filter = request.input('filter')

        const bIds = await BookUnit
               .query()
               .where('book_id', request.params.id)
               .ids()

                if (filter) {
                    if (filter.search("description") !== -1) {
                        let description = filter.match(/(?<=description~contains~').*?(?=')/)
                        questions.where('description', 'ilike', '%' + description[0] + '%') //Add new condition
                    }
                    if (filter.search('unit') !== -1) {
                        let unit = filter.match(/(?<=unit~contains~').*?(?=')/)
                        bIds.where('unit', '=', unit[0]) //Add new condition
                    }
                }

        const questions = Question
             .query()
             .whereIn('book_unit_id', bIds)
             .with('book_unit')



        if (filter) {
            if (filter.search("description") !== -1) {
                let description = filter.match(/(?<=description~contains~').*?(?=')/)
                questions.where('description', 'ilike', '%' + description[0] + '%') //Add new condition
            }
        }

        return await questions.paginate(page, pageSize) //Now query is executed

but now i have:

> bIds.where is not a function",

@Edit new tentative:

async show({ request }){

        const { page, pageSize } = request.get();
        const filter = request.input('filter')

        const bIds = await BookUnit
               .query()
               .where('book_id', request.params.id)
               .ids()

        const questions = Question
             .query()
             .with('book_unit', (builder) => {
                if(filter){
                    if (filter.search('unit') !== -1) {
                        let unit = filter.match(/(?<=unit~contains~').*?(?=')/)
                        builder.where('unit', '=', unit[0]) //Add new condition
                    }
                }
            })
            .whereIn('book_unit_id', bIds)

        //Filtros
        if (filter) {
            if (filter.search("description") !== -1) {
                let description = filter.match(/(?<=description~contains~').*?(?=')/)
                questions.where('description', 'ilike', '%' + description[0] + '%') //Add new condition
            }
        }

        return await questions.paginate(page, pageSize) //Now query is executed
} [![enter image description here][1]][1]

找不到单位，但问题继续显示在我的网格中...

Answer 1

您必须fetch 或paginate 查询结果。

我的解决方案是只在最后执行查询并一一添加条件。喜欢：

const page = 1
const pageSize = 2
const filter = request.input('filter')

const bIds = await BookUnit
       .query()
       .where('book_id', 2)
       .ids()

/*
Remove await -> Query is not executed yet
See below
*/
const questions = Question
     .query()
     .whereIn('book_unit_id', bIds)
     .with('book_unit')

//Filtros
if (filter) {
    if (filter.search("description") !== -1) {
        let description = filter.match(/(?<=description~contains~').*?(?=')/)
        questions.where('description', 'ilike', '%' + description[0] + '%') //Add new condition
    }
    if (filter.search('unit') !== -1) {
        let unit = filter.match(/(?<=unit~contains~').*?(?=')/)
        questions.where('unit', '=', unit[0]) //Add new condition
    }
}

return await questions.paginate(page, pageSize) //Now query is executed

信息

在我的测试中，我没有使用带有过滤器的部件。我使用了一个简单的条件。喜欢：

questions.where('book_unit_question.description', 'like', '%1%') // Test add new condition

文档：How to prevent Knex.js from running a query object when returning it from an async function?