Sometimes, we want to make a collection store unique entries if the entry not null with Mongoose.
In this article, we’ll look at how to make a collection store unique entries if the entry not null with Mongoose.
How to make a collection store unique entries if the entry not null with Mongoose?
To make a collection store unique entries if the entry not null with Mongoose, we can specify a unique constraint when we define the schema.
For instance, we write
const UsersSchema = new Schema({
name: {
type: String,
trim: true,
index: true,
required: true
},
email: {
type: String,
trim: true,
index: {
unique: true,
partialFilterExpression: {
email: {
$type: "string"
}
}
}
}
});
to define UserSchema with the email field required to be unique for each entry.
The constraint is set by setting index.unique to true.
Conclusion
To make a collection store unique entries if the entry not null with Mongoose, we can specify a unique constraint when we define the schema.
