假如我有如下两个 Collection ：颜色和花，我要按颜色统计，对应的花的数量应该怎么写呢？用 mongoose 。
var color = new mongoose.Schema({
color: {type: String}
});
var flower = new mongoose.Schema({
name:{type:String},
color: {type: mongoose.Schema.ObjectId,ref:'Color'}
});
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