Question

我无法使用MongoDB进行正确排序。我基本上想要在分组后对分组结果进行排序。

例如：我想通过手机对结果进行分组，但每部手机可能有100笔交易。我希望在结果分组之前按手机成本和线路租金对这些进行排序。

这是我到目前为止所做的：

array(
    '$group' => array(
        '_id' => '$handset_numeric_id',
        'full_handset_name' => array('$push' => '$full_handset_name'),
        'deal_id' => array('$push' => '$deal_id'),
        'handset_url' => array('$push' => '$handset_url'),
        'deal_url' => array('$push' => '$deal_url'),
        'image_url' => array('$push' => '$image_url'),
        'phone_cost' => array('$push' => '$phone_cost'),
        'tariff_name' => array('$push' => '$tariff_name'),
        'minutes' => array('$push' => '$minutes'),
        'texts' => array('$push' => '$texts'),
        'data' => array('$push' => '$data'),
        'effective_monthly_cost' => array('$push' => '$effective_monthly_cost'),
        'network_numeric_id' => array('$push' => '$network_numeric_id'),
        'network_name' => array('$push' => '$network_name'),
        'manufacturer_name' => array('$push' => '$manufacturer_name'),
    ),
),
    array(
        '$sort' => array(
            'phone_cost' => 1,
            'effective_monthly_cost' => 1
        )
    ),
);

对我来说，解决这个问题的最佳途径是什么？

更新：

这是我得到的结果：

Samsung Galaxy S III Mini amber Orange  0   47  The Works 47 (24m)  5000

Samsung Galaxy Y S5360 white    Orange  0   38.67   The Works 47 (24m)  5000

Samsung Galaxy S III Mini black Orange  0   42.83   The Works 47 (24m)  5000

Samsung Galaxy S III amber  Orange  0   47  The Works 47 (24m)  500

正如您在上面所看到的，MongoDB已经选择了三星Galaxy Y S5360白色，价格为38.67英镑，但这不是最便宜的每月有效费用。

如果查看下面的数据，您会看到最便宜的有效月费为27.21英镑

Samsung Galaxy Y S5360 white    Orange  0   27.21   The Works 47 (24m)  5000

Samsung Galaxy Y S5360 white    Orange  0   28.46   The Works 47 (24m)  5000    

Samsung Galaxy Y S5360 white    Orange  0   29.29   The Works 47 (24m)  5000

Samsung Galaxy Y S5360 white    Orange  0   31.38   The Works 52 (24m)  8000    

Samsung Galaxy Y S5360 white    Orange  0   31.38   The Works 52 (24m)  8000    

Samsung Galaxy Y S5360 white    Orange  0   32.21   The Works 47 (24m)  5000    

Samsung Galaxy Y S5360 white    Orange  0   33.67   The Works 52 (24m)  8000    

Samsung Galaxy Y S5360 white    Orange  0   34.5    The Works 52 (24m)  8000    

Samsung Galaxy Y S5360 white    Orange  0   38.67   The Works 47 (24m)  5000    

Samsung Galaxy Y S5360 white    Orange  0   47  The Works 47 (24m)  5000

我输入的数据示例：

array (
  'deal_id' => '815300000000',
  'handset_numeric_id' => 305110,
  'handset_url' => 'samsung-galaxy-s4-active-grey',
  'deal_url' => 'samsung-galaxy-s4-active-grey?type=paym&deal=m056030510815300000000',
  'image_url' => 'samsung-galaxy-s4-active-grey',
  'handset_id' => 'galaxys4activegrey',
  'phone_cost' => 0,
  'tariff_numeric_id' => 814553,
  'tariff_id' => 'talktalk300-3000-1500-354441.24',
  'tariff_name' => '300 mins and 3000 texts with 1.5GB (24m)',
  'network_name' => 'TalkTalk',
  'network_numeric_id' => 1345,
  'term' => 24,
  'minutes' => 300,
  'texts' => 3000,
  'data' => 1500,
  'org_line_rental' => 35,
  'effective_monthly_cost' => 35,
  'total_cost_over_term' => 840,
  'gift_category' => 'Free Connection',
  'gift_category_numeric_id' => 2,
  'free_gift_id' => 0001,
  'free_gift_name' => 'FREE Sony PS3 Super Slim 500GB',
  'cashback' => 0,
  'free_lr' => 0,
  'half_lr' => 0,
  'included_cashback' => 0,
  'free_lr_number' => 0,
  'half_lr_number' => 0,
  'free_half_amount' => 0,
  'clearance_flag' => 0,
  'manufacturer_numeric_id' => 2,
  'manufacturer_name' => 'Samsung',
  'full_handset_name' => 'Samsung Galaxy S4 Active grey',
  'popularity' => 15534234202,
  'handset_colour' => 'grey',
  'tariff_type' => 'paym',
  'feature_ids' => '4,w,b,x,c,8,v,t,r,l,q,i,',
  'operating_system' => 'Android OS v4.2.2',
  'retailer_id' => 'talktalk',
  'retailer_name' => 'TalkTalk',
)

Answer 1

问题在于您在分组完成后有效排序。如果电话或线路费用因1个手机（例如手机A）而异，那么您应该在分组键（_id）中包含费用。目前，您只需为手机A创建一系列电话费和线路租赁费用。

对于您想要做的事情，最好的方法是将价格和线路租金包含在您的分组键中。用以下内容替换你的组_id键。

$group => array( '_id' => array(handsetId => '$author', phone_cost => '$phone_cost', effective_monthly_cost=> '$effective_monthly_cost' ),

...

然后在聚合管道的下一步中，您可以按电话费用或线路租赁进行排序。

希望有所帮助

MongoDB在组之前聚合排序

1 个答案: