Question

我有从数据库响应中获得的对象数组。每个对象都有名称，课程名称，课程，时间，日期。在我的数据库中它是一对多的关系 - ＆gt;意味着每个讲座都有很多课程，所以我有一个讲座和时间表。

时间表具有讲话的foreign_key，这意味着讲座表：lecture_id（primary_key）+更多属性。 times table：id_lecture（foreign_key），id_time（primary_key）+更多属性。我做了一个查询

“SELECT * from lectures，Times where id_lecture = lecture_id”;

它工作正常，并给我我想要的结果。问题是每个讲座都有一些课程，我想在同一个离子项目中显示这些课程并将其发送给一个对象。换句话说，我想这样做。

这是我获取数据的代码

  this.coursesData.LoadLectures()
        .subscribe(LectureList=> {
           console.log("getLec1");
          LectureList.forEach(lecture=>{
            console.log(lecture);
          var newLecture={
                name:lecture.name,
                email:lecture.email,
                phone:lecture.phone ,
                lesson_type:lecture.lesson_type ,
                detailsHours:{'start_time':lecture.start_time,'end_time':lecture.end_time,'class':lecture.class, 'day':lecture.day},
                details:lecture.details,
                course_name:lecture.course_name
          }
            this.coursesA.push(newLecture);
            this.coursesNames.push(lecture.course_name);
            this.LecturesNames.push(lecture.name);
          });
          //this.courseSelect=this.coursesNames[0];
          this.coursesAD=this.coursesA;
          this.coursesNames = this.coursesNames.filter(function(elem, index, self) {
                  return index == self.indexOf(elem);
              })
             // console.log("co"+this.coursesA);


               this.loader.dismiss();
               //console.log(this.LecturesNames);
        // return this.coursesA;

        },err=>{
          console.log(err);
        });
  }

你可以看到newLecture包含

 var newLecture={
                name:lecture.name,
                email:lecture.email,
                phone:lecture.phone ,
                lesson_type:lecture.lesson_type ,
                detailsHours:{'start_time':lecture.start_time,'end_time':lecture.end_time,'class':lecture.class, 'day':lecture.day},
                details:lecture.details,
                course_name:lecture.course_name
          }

但是有许多课程，所以如果我这样做是因为它会复制名称。

我试过这种方式，但它显示我的错误

 public Lectures(){
  console.log("getLec");
  this.courseSelect='';
  this.coursesNames=[];
  this.LecturesNames=[];
  this.coursesA=[];

 this.coursesData.LoadLectures()
    .subscribe(LectureList=> {
       console.log("getLec1");
      LectureList.forEach(lecture=>{
        console.log(lecture);
      var newLecture={
            id:lecture.id_lecture,
            name:lecture.name,
            email:lecture.email,
            phone:lecture.phone ,
            lesson_type:lecture.lesson_type ,
            detailsHours:{'start_time':lecture.start_time,'end_time':lecture.end_time,'class':lecture.class, 'day':lecture.day},
            details:lecture.details,
            course_name:lecture.course_name
      }
        console.log("de"+newLecture.detailsHours.start_time);
        if(!newLecture.id){
          this.coursesA[newLecture.id]=newLecture;
       // this.coursesNames.push(lecture.course_name);
        //this.LecturesNames.push(lecture.name);
        }
        else{
          this.coursesA[newLecture.id].push(newLecture);
        }

      });
      this.coursesAD=this.coursesA;

      //this.courseSelect=this.coursesNames[0];

      console.log(this.coursesA);
      /*this.coursesNames = this.coursesNames.filter(function(elem, index, self) {
              return index == self.indexOf(elem);
          })
           */

         // console.log("co"+this.coursesA);

           this.loader.dismiss();
           console.log("lets"+this.LecturesNames);
    // return this.coursesA;


    },err=>{
      console.log(err);
    });

}

我收到了这个错误

TypeError：无法读取未定义
的属性'push'

有人有办法解决吗？

Answer 1

我认为您可以使用子阵列按名称（或course_name）对课程进行分组。您可以将其newLecture推入courseA，而不是在courseA[newLecture.name]内推送{ "JAVA Course": [ { lecture1 }, { lecture2 } }], "JS Course": [ { lecture3 }, { lecture4 } }] }。

因此，你会有类似的东西：

<ion-item ng-repeat="(key, value) in obj">
    <p>{{key}}</p> <!-- example: JAVA Course -->
    <div ng-repeat="(subkey, subvalue) in value">
        {{subvalue}} <!-- example: lecture hours -->
    </div>
</ion-item>

然后，在您的模板中，您可以这样做：

from colander import SchemaNode as SchemaNodeNoNull

class _SchemaNode(SchemaNodeNoNull):

    nullable = True

    def __init__(self, *args, **kwargs):
        # if this node is required but nullable is not set, then nullable is
        # implicitly False
        if kwargs.get('missing') == required and kwargs.get('nullable') is None:
            kwargs['nullable'] = False
        super(_SchemaNode, self).__init__(*args, **kwargs)

    def deserialize(self, cstruct=null):
        if cstruct == '':
            if not self.nullable:
                raise Invalid(self, _('Cannot be null'))
            if self.validator:
                self.validator(self, cstruct)
            return None  # empty string means explicit NULL value
        ret = super(_SchemaNode, self).deserialize(cstruct)
        return ret

离子2：具有相同值的marge细节

1 个答案: