Mongoose和Express子文檔API

我有一個適用於這些文檔的API，但我無法獲得子文檔在其中工作。Mongoose和Express子文檔API

這裏是路由器：

router.get('/locations/:locationid/reviews/:reviewid', ctrlReviews.reviewsReadOne);

這裏是控制器：

module.exports.reviewsReadOne = function(req, res) { 
    console.log("getting single review"); 
// error trap 1: check that locationid exists in request parameters 
    if (req.params && req.params.locationid) { 
    Loc 
     .findById(req.params.locationid) 
     .select('name reviews') 
     .exec(
     function(err, location) { 
      var response, review; 
// error trap 2: if mongoose doesn't return a location, send 404 message and exit function scope using return statement 
      if (!location) { 
      sendJsonResponse(res, 404, { 
       "message": "locationid not found" 
      }); 
      return; 
// error trap 3: if mongoose returned an error, send it as 404 response and exit controller using return statement 
      } else if (err) { 
      sendJsonResponse(res, 404, err); 
      return; 
      } 
// check that returned location has reviews 
      if (location.reviews && location.reviews.length > 0) { 
// use mongoose subdocument .id method as a helper for searching for matching ID 
      review = location.reviews.id(req.params.reviewid); 
// if review isn't found return an appropriate response 
      if (!review) { 
       sendJsonResponse(res, 404, { 
       "message": "reviewid not found" 
       }); 
// if review is found build response object returning review and location name and ID 
      } else { 
       response = { 
       location: { 
        name: location.name, 
        id: req.params.locationid 
       }, 
       review: review 
       }; 
       sendJsonResponse(res, 200, response); 
      } 
// if no reviews are found return an appropriate error message 
      } else { 
      sendJsonResponse(res, 404, { 
       "message": "No reviews found" 
      }); 
      } 
     }); 
// if request parameters didn't include locationid, send appropriate 404 response 
    } else { 
    sendJsonResponse(res, 404, { 
     "message": "No reviews found" 
    }); 
    } 
};

文檔/子文檔我試圖進入API是this。文檔本身在API中工作良好，但我無法得到這個子文檔。如果我提供reviewid，則得到的錯誤是它找不到審閱ID。

** ------編輯------ ** 我沒有正確地將子文檔推送到文檔中。這是推動一個子文檔都有自己的ID字段到文檔中的正確方法：

db.locations.update({ 
"name" : "Starcups", 
}, { 
$push: { 
    'reviews' : { 
     author: 'kyle riggen1', 
     _id: new ObjectId(), 
     rating: 4, 
     timestamp: new Date("Jun 1, 2015"), 
     reviewText: "will the ID work?", 
    } 
    } 
});

我只是缺少下劃線「_id：」

來源

2016-03-02 KyleRiggen

的可能的複製[檢索只在查詢的元素在MongoDB集合中的對象數組]（http://stackoverflow.com/questions/3985214/retrieve-only-the-queried-element-in-an-object-array-in-mongodb-collection） –

這意味着你的代碼是真正跳過箍環來做一些MongoDB本身處理的事情。如果你只是想要一個特定的「reviewid」數組條目，那麼只需要在響應中要求匹配的元素。 –

我是不是正確的推子文檔到文檔。這是推動一個子文檔都有自己的ID字段到文檔中的正確方法：

db.locations.update({ 
"name" : "Starcups", 
}, { 
$push: { 
    'reviews' : { 
     author: 'kyle riggen1', 
     _id: new ObjectId(), 
     rating: 4, 
     timestamp: new Date("Jun 1, 2015"), 
     reviewText: "will the ID work?", 
    } 
    } 
});

我只是缺少下劃線在「_id：」

來源

2016-03-02 02:19:44 KyleRiggen

Mongoose和Express子文檔API

回答

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