全文搜索和项目

Question

猫鼬子场聚集我有一个猫鼬模型称为会议与命名当然（课程模型）领域，我想在会议与执行全文搜索全文搜索，还我想使用字段汇总结果从当然子场和选择像当然，日期等 一些领域我试过如下：

Session.aggregate(
     [ 
      { 
       $match: { $text: { $search: 'web' } } 
      }, 
      { $unwind: '$course' }, 
      { 
       $project: { 
        course: '$course', 
        date: '$date', 
        address: '$address', 
        available: '$available' 
       } 
      }, 
      { 
       $group: { 
        _id: { title: '$course.title', category: '$course.courseCategory', language: '$course.language' } 
       } 
      } 
     ], 
     function(err, result) { 
      if (err) { 
       console.error(err); 
      } else { 
       Session.deepPopulate(result, 'course course.trainer 
        course.courseCategory', function(err, sessions) { 
        res.json(sessions); 
      }); 
      } 
     } 
    ); 

我的模型：

• 会议

  schema = new mongoose.Schema( { date: { type: Date, required: true }, course: { type: mongoose.Schema.Types.ObjectId, ref: 'course', required: true }, palnning: { type: [Schedule] }, attachments: { type: [Attachment] }, topics: { type: [Topic] }, trainer: { type: mongoose.Schema.Types.ObjectId, ref: 'trainer' }, trainingCompany: { type: mongoose.Schema.Types.ObjectId, ref: 'training-company' }, address: { type: Address }, quizzes: { type: [mongoose.Schema.Types.ObjectId], ref: 'quiz' }, path: { type: String }, limitPlaces: { type: Number }, status: { type: String }, available: { type: Boolean, default: true }, createdAt: { type: Date, default: new Date() }, updatedAt: { type: Date } }, { versionKey: false } );

• 场

let schema = new mongoose.Schema( { title: { type: String, required: true }, description: { type: String }, shortDescription: { type: String }, duration: { type: Duration }, slug: { type: String }, slugs: { type: [String] }, program: { content: { type: String }, file: { type: String } }, audience: [String], requirements: [String], language: { type: String, enum: languages }, price: { type: Number }, sections: [Section], attachments: { type: [Attachment] }, tags: [String], courseCategory: { type: mongoose.Schema.Types.ObjectId, ref: 'course-category', required: true }, trainer: { type: mongoose.Schema.Types.ObjectId, ref: 'trainer' }, trainingCompany: { type: mongoose.Schema.Types.ObjectId, ref: 'training-company' }, status: { type: String, default: 'draft', enum: courseStatus }, path: { type: String }, cover: { type: String, required: true }, duration: { type: Number, min: 1 }, createdAt: { type: Date, default: Date.now }, updatedAt: { type: Date } }, { versionKey: false } );

我不知道，如果是我的尝试是要带我我想要什么，我得到关于$此错误放松操作：

MongoError: exception: Value at end of $unwind field path '$course' must be an Array, but is a OID

任何形式的帮助将是非常赞赏。

Answer 1

你可以试试下面聚集。

你缺少$lookup在课程文档中从会议文件加入了关于课程对象ID来标识拉过程文档所需。

$project阶段保持在输出所需的字段。

Session.aggregate([ 
    { 
    "$match": { 
     "$text": { 
     "$search": "web" 
     } 
    } 
    }, 
    { 
    "$lookup": { 
     "from": "courses", 
     "localField": "course", 
     "foreignField": "_id", 
     "as": "course" 
    } 
    }, 
    { 
    "$project": { 
     "course": 1, 
     "date": 1, 
     "address": 1, 
     "available": 1 
    } 
    } 
]) 

课程是一个包含一个课程文档的数组。您可以使用$arrayElemAt来投影文档。

"course": {"$arrayElemAt":["$course", 0]}