[英]How to store empty array in mongodb
I want to store empty array in user schema's friends key.我想将空数组存储在用户模式的朋友键中。 But, mongoose won't let me to add empty array of friends.
但是,mongoose 不会让我添加空的朋友数组。
Here's my User schema这是我的用户架构
const userSchema = mongoose.Schema({
firstName: {
type: String,
required: true,
},
lastName: {
type: String,
required: true,
},
userName: {
type: String,
unique: true,
required: true,
},
email: {
type: String,
required: true,
unique: true,
validate: [validator.isEmail, "Please enter a valid Email"],
},
password: {
type: String,
required: true,
minlength: [6, "Password must be at least 6 characters"],
},
friends: [
{
type: mongoose.Schema.Types.ObjectId,
ref: 'User'
unique: true,
},
],
});
And here's my code to pull data from array and save empty array这是我从数组中提取数据并保存空数组的代码
const index = req.user.friends.findIndex(friend => friend.toString() === req.params.id);
if(index !== -1){
req.user.friends.splice(index, 1);
}else{
req.user.friends.push(req.params.id);
}
const user = new User(req.user);
await user.save({validateBeforeSave: false});
return res.json({success: true});
specify default value instead改为指定默认值
friends: [
{
type: mongoose.Schema.Types.ObjectId,
ref: 'User'
unique: true,
default: []
},
],
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