Mongoose aggregate group cond error The $cond accumulator is a unary operator-CodePudding

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Mongoose aggregate group cond error The $cond accumulator is a unary operator

Time：09-16

 
{
$group: {
_id: {
Uid: '$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']}, 
} 
}