在mongo 命令行下执行如下查询
db.users.find({})能正常的读取集合中的所有数据，
但是执行如下查询命令，则报错
db.users.find({loginname:'test'})error: {
"$err" : "Unable to execute query: error processing query: ns=im.users limit=0 skip=0\nTree: loginname == \"lidian\"\nSort: {}\nProj: {}\n No query solutions",
"code" : 17007
}mongodb 配置的副本集（Replica Set）
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There is no problem with the query statement. There should be an error somewhere else. Create a new table and test it
General query, no problem.
It’s no problem to check one.
Sir, you can check if there is a loginname field in your user collection.