【发布时间】：2015-05-17 06:35:10
【问题描述】：
我有一个包含如下记录的集合：
{
"_id" : ObjectId("55024bb1f36088d8ce7a79e8"),
"date_taken" : ISODate("2015-01-13T13:50:31.000Z"),
"db_filename" : "2015-01-13 13.50.31.jpg",
"db_original_height" : 3264,
"db_latitude" : -44.66694444444444,
"db_tags" : [
"January",
"2015",
"Tuesday",
"GT-I9300",
"SAMSUNG",
"New Zealand/Aotearoa",
"Southland",
"Afternoon",
"Medium file"
],
"db_original_path" : "/Users/hingem/my_image_store/imgs/2015-01-13 13.50.31.jpg",
"db_date_taken" : ISODate("2015-01-13T13:50:31.000Z"),
"db_ImageUniqueID" : "ZDFI02\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000",
"db_thumb_path" : "/Users/hingem/thumbs/imgs/2015-01-13 13.50.31_tm.jpg",
"db_flash_fired" : 0,
"db_has_exif" : true,
"db_size" : 3224612,
"db_model" : "GT-I9300",
"db_location" : true,
"db_large_path" : "/Users/hingem/thumbs/imgs/2015-01-13 13.50.31_lg.jpg",
"db_longitude" : 167.9216666666667,
"db_make" : "SAMSUNG",
"db_medium_path" : "/Users/hingem/thumbs/imgs/2015-01-13 13.50.31_md.jpg",
"db_original_width" : 2448,
"db_orientation" : 1,
"db_address" : "Milford Foreshore Walk, Milford Sound, Southland, New Zealand/Aotearoa",
"db_country" : "New Zealand/Aotearoa",
"db_state" : "Southland",
"db_road" : null
}
重要的一点是 db_tags 字段，它是一个标签列表。我想查询包含或排除某些标签的所有记录。我的工作很薄：
db.images.find({'db_tags':
{'$all': ['Medium file', '2015']}
})
返回包含两个标签的所有记录。如何向该查询添加 $nin 子句？所以在伪代码中：
给我所有 db_tag 包含“Medium file”和“2015”但 db_tags 不包含“January”的记录
【问题讨论】：
-
只要把条件加到同一个子文档中：{'db_tags': {'$all': ['Medium file', '2015'],$nin:["January"]} }
标签： mongodb mongodb-query