MongoError:无法识别的管道阶段名称:' $ addFields'。 " mongoose":" ^ 4.5.8" 我的源代码:
Post.aggregate(
[{
$addFields: {
userName: { $concat: [ "$author.firstName", " ", "$author.lastName" ] }
}
//$project: { userName: { $concat: [ "$author.firstName", " ", "$author.lastName" ] } } //this is ok!
}],
function (err, result) {
if (err) {
console.log(err);
return;
}
console.log(result);
}
)
发布模型:
let schema = {
id: "post",
properties: {
content: {type: "string"},
author: {
type: "object",
id: {type: "string"},
avatar: {type: "string"},
firstName: {type: "string"},
lastName: {type: "string"},
status: {type: "string"}
},
category: {
type: "object",
id: {type: "string"},
name: {type: "string"}
},
images: {
type: "array",
items: {
type: "object",
properties: {
filePath: {type: "string"},
}
}
},
video: {
type: "object",
thumbnail: {type: "string"},
filePath: {type: "string"}
},
likes: {
type: "array",
items: {
type: "object",
properties: {
userId: {type: "string"},
status: {type: "string"},
_id : {type: "string", default: null}
}
}
},
shares: {
type: "array",
items: {
type: "object",
properties: {
userId: {type: "string"},
status: {type: "string"},
destination: {type: "string"}, //FACEBOOK|TWISTER|GOOGLE
_id : {type: "string", default: null}
}
}
},
favorites: {
type: "array",
items: {
type: "object",
properties: {
userId: {type: "string"},
status: {type: "string"},
_id : {type: "string", default: null}
}
}
},
comments: {
type: "array",
items: {
type: "object",
properties: {
commentId: {type: "string"},
_deleted: {type: "Date", default: ''},
_id : {type: "string", default: null}
}
}
},
_created: {type: "Date", default: Date.now},
_deleted: {type: "Date", default: ''},
_updated: {type: "Date", default: ''}
}
答案 0 :(得分:8)
$addFields
。正如您所评论的那样,您使用的是mongo 3.2.9,所提到的查询将无效。
如果由于某种原因无法更新mongo版本,则必须使用以下方法,您需要迭代每个文档并设置新字段
Post.find({}).forEach(function(post){
post.findOneAndUpdate({_id: post._id},
{$set: {userName: post.author.firstName + " " + post.author.lastName }})
});