{
$group: {
_id: {
Uid: '$uid,
Role: '$role'
},
Nickname: {$cond: [{$eq:} [$role, 2], '$nickname', 'test']},
}
}
An error
The $cond accumulator is a unary operator
What's wrong with the don't know, bosses, please help to look at, thank you very much
CodePudding user response:
Has been solved, in the $used in the project
{
$project: {
_id: 0,
Uid: '$uid,
Role: '$role',
Nickname: {$cond: [{$eq:} [$role, 2], '$nickname', 'test']},
}
}