Node js, mongodb: check if object exists
I am new to nodejs and mongodb, so how can I check if an object exists in collections, Please note that my field type in schema is object or JSON
const BillSchema = mongoose.Schema(
{
content: {
type: Object //or JSON
},
}
);
const Bill = module.exports = mongoose.model('Bill', BillSchema);
module.exports.addBill = function (newBill, callback) {
//Check for all bill titles and content, if newBill doesn't exist then add else do nothing
Bill.count({ content: newBill.content }, function (err, count) {
//count == 0 always ???
if (err) {
return callback(err, null);
} else {
if (count > 0) {
//The bill already exists in db
console.log('Bill already added');
return callback(null, null);
} else { //The bill doesnt appear in the db
newBill.save(callback);
console.log('Bill added');
}
}
});
}
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1 answer
One of the pleasant questions. You asked me, I should have done the same task before, I am using mongoose-unique-validator 3rd party npm package and plugin for our schema
https://www.npmjs.com/package/mongoose-unique-validator
npm install mongoose-unique-validator
var uniqueValidator = require('mongoose-unique-validator');
const BillSchema = mongoose.Schema(
{
content: {type:Object , unique:true },
}
);
BillSchema.plugin(uniqueValidator, {message: 'is already taken.'});
Using:
module.exports.addBill = function (newBill, callback) {
newBill.save(callback);
}
Hopefully if this works for you too.
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