這裏的課程集合:如何限制在MongoDB中返回嵌套數組場
{
"_id": "RtPA6Cxs3fzJcGpgP",
"Seasons": [
{
"title": "intro",
"Episodes": [
{
"title": "what is c++?",
"length": "12:52",
"free_url": "free-episode-1.mp4"
},
{
"title": "why c++?",
"length": "05:20",
"paid_url": "premium-episode-1.mp4"
}
]
},
{
"title": "first season",
"Episodes": [
{
"title": "declare variables",
"length": "12:35",
"paid_url": "premium-episode-2.mp4"
},
{
"title": "pointers",
"length": "04:00",
"free_url": "free-episode-2.mp4"
}
]
}
]
}
我試圖讓(一切,除了paid_url S):
{
"_id": "RtPA6Cxs3fzJcGpgP",
"Seasons": [
{
"title": "intro",
"Episodes": [
{
"title": "what is c++?",
"length": "12:52",
"free_url": "free-episode-1.mp4"
},
{
"title": "why c++?",
"length": "05:20"
}
]
},
{
"title": "first season",
"Episodes": [
{
"title": "declare variables",
"length": "12:35"
},
{
"title": "pointers",
"length": "04:00",
"free_url": "free-episode-2.mp4"
}
]
}
]
}
嘗試了這些疑問: 1.這適用於客戶端(鍍鉻控制檯),但它不適用於「流星芒戈」:
db.courses.find({_id: "RtPA6Cxs3fzJcGpgP"}, {fields: {"Seasons.Episodes.paid_url": 0}}).fetch()
我得到的 「流星蒙戈」 錯誤:
「$ ERR」:「無法規範化查詢:不支持的badValue投影選項:字段:{$四季情節$ paid_url:。0.0} 「`
嘗試這樣做太:
Courses.find({_id: this.params.id}, {fields: {"Seasons.$.Episodes.$.paid_url": 0}});
不能使用'$'你需要指定你正在尋找它的確切數量不是支持minimongo –
的查詢工作,而不在鍍鉻$跡象控制檯,但它不適用於Meteor。 – l3est