猫鼬可选的搜索查询参数?

问题描述：

我有以下情况. 我需要根据某些参数构建猫鼬查询.

I have a following situation. I need to build a mongoose query, based on certain arguments if present.

即如果这样的对象通过了

I.e. if object like this is passed

{
    player: "nickname",
    action: "capture"
}

执行以下搜索:

Entry.find({
    player: obj.player,
    action: obj.action
}).
    exec(function(err, res){
        console.log(res);
    });

如果如果动作不在对象中，则需要从搜索中排除动作"，该怎么办? 像action: (obj.action) ? obj.action:null这样使用三元运算符不起作用，就像在action为null的DB中搜索条目一样.

If I need to exclude "action" from search if action is not in the object, what should I do? Using ternary operator like action: (obj.action) ? obj.action:null doesn't work, as would search entries in DB where action is null.

答

以编程方式构建查询对象:

Build up your query object programmatically:

var query = {
    player: 'player'
};

if (obj.action) {
    query.action = obj.action;
}

Entry.find(query).exec(function(err, res){
    console.log(res);
});

猫鼬可选的搜索查询参数?

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