mongoimport 显示错误：E11000 重复键错误

Question

我正在做一个关于 Flask 的教程。我正在尝试将 json 文件中的一些信息添加到 MongoDB 数据库中

users.json

[{"id":1,"first_name":"Jacques","last_name":"Blazewicz","email":"jblazewicz0@posterous.com","password":"k9doaly"},
{"id":2,"first_name":"Budd","last_name":"Zellick","email":"bzellick1@uol.com.br","password":"kik8N0cyKG"},
{"id":3,"first_name":"Simone","last_name":"Brenston","email":"sbrenston2@squarespace.com","password":"9BO7nEvdci8"},
{"id":4,"first_name":"Waneta","last_name":"Stading","email":"wstading3@google.es","password":"GpzWY536X"},
{"id":5,"first_name":"Barbey","last_name":"Corder","email":"bcorder4@csmonitor.com","password":"BXFkbgEz"},
{"id":6,"first_name":"Becca","last_name":"Hartington","email":"bhartington5@wsj.com","password":"ijh3RfxcGB"},
{"id":7,"first_name":"Elyse","last_name":"Eddy","email":"eeddy6@archive.org","password":"QJHg5Gc0V"},
{"id":8,"first_name":"Reggie","last_name":"Souster","email":"rsouster7@4shared.com","password":"nmCeQGRC"},
{"id":9,"first_name":"Brnaby","last_name":"Abrahmson","email":"babrahmson8@digg.com","password":"BqOgwfIMJmTx"},
{"id":10,"first_name":"Yuma","last_name":"Graine","email":"ygraine9@tmall.com","password":"4VpkAWyL"},
{"id":11,"first_name":"Quinton","last_name":"Chater","email":"qchatera@squarespace.com","password":"7x6IYp"},
{"id":12,"first_name":"Raymund","last_name":"Moorman","email":"rmoormanb@indiatimes.com","password":"aRgaXm1"},
{"id":13,"first_name":"Boycey","last_name":"Ferrelli","email":"bferrellic@cnet.com","password":"VCKtIJEUi"},
{"id":14,"first_name":"Ty","last_name":"Raffeorty","email":"traffeortyd@cnet.com","password":"wVOd2oi"},
{"id":15,"first_name":"Judie","last_name":"Penella","email":"jpenellae@psu.edu","password":"0WP0F6516"},
{"id":16,"first_name":"Alden","last_name":"Gemlett","email":"agemlettf@independent.co.uk","password":"3rAW4wlTsCWz"},
{"id":17,"first_name":"Josephina","last_name":"MacLeod","email":"jmacleodg@livejournal.com","password":"gQ7ytj7CtA6"},
{"id":18,"first_name":"Lorene","last_name":"Lindeberg","email":"llindebergh@chron.com","password":"Q4WU8aHkm"},
{"id":19,"first_name":"Lamar","last_name":"Sotham","email":"lsothami@rediff.com","password":"5yyhnYPTDs"},
{"id":20,"first_name":"Derek","last_name":"Breakey","email":"dbreakeyj@home.pl","password":"jrz2kl2jeX"}]

我在终端运行这个命令：

mongoimport --jsonArray --db UTA_Enrollment --collection user --file users.json

我只获取第一行，而不是获取数据库中的所有 20 行，并且这些错误消息显示在命令行中。

2021-02-25T17:47:40.654-0800    connected to: mongodb://localhost/
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    continuing through error: E11000 duplicate key error collection: UTA_Enrollment.user index: user_id_1 dup key: { user_id: null }
2021-02-25T17:47:40.658-0800    1 document(s) imported successfully. 19 document(s) failed to import.

我之前曾在 python 中运行过这些代码行，并且已经从数据库中删除了两个已注释的条目。

class User(db.Document):
    user_id     =   db.IntField( unique=True )
    first_name  =   db.StringField( max_length=50 )
    last_name   =   db.StringField( max_length=50 )
    email       =   db.StringField( max_length=30 )
    password    =   db.StringField( max_length=30 )

@app.route("/user")
def user():
    # User(user_id=1, first_name="Frank", last_name="Ho", email="frank.ho@uta.com", password="password123").save()
    # User(user_id=2, first_name="Mary", last_name="Jane", email="mary.jane@uta.com", password="abc1234").save()
    users = User.objects.all()
    return render_template("user.html", users=users)

我不知道为什么会这样，因为每个条目的 id 都不同。感谢您的帮助

Answer 1

user_id 似乎有一个索引强制字段值是唯一的

但是在您的 users.json 文件中，没有 user_id 字段。因此，在导入数据时，它会为所有用户创建具有空值的字段。并且由于该字段是唯一的，因此您会遇到此错误dup key:

因此，要解决此问题，您必须删除 user_id 字段上的索引。 一个文档的标识符在mongodb中命名为_id