Posted by: admin November 7, Darius genesis mini rom download a comment. I think this is possible in MongoDB, but through the Mongoose wrapper things appear to be broken. So for something like this:. But it would still be nice to let it be handled natively. This behavior happen also if you have left some duplicates in Mongo.
Mongoose will try to create them in Mongo when your application starts up. I ran into the same issue: I added the unique constraint for the email field to our UserSchema after already having added users to the db, and was still able to save users with dupe emails. I resolved this by doing the following:. MongoDB cannot create a unique index on the specified index field s if the collection already contains data that would violate the unique constraint for the index.
Ok, i was able to resolve this from the mongoshell by adding the index on the field and setting the unique property:. When using methods like findOneAndUpdate you will need to pass this configuration object:. January 30, Nodejs Leave a comment. Questions: I am trying to connect to an Oracle database from Node. Is this possible?
I have not found a plugin for Node. Are there any recommended wor Now, when a u Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Add menu. Mongoose Unique index not working! You just have to restart mongo. And re-index too! To prevent this, you can handle this error this way : yourModel.
I resolved this by doing the following: 1 Remove all documents from the users collection. Ok, i was able to resolve this from the mongoshell by adding the index on the field and setting the unique property: db. Connecting to Oracle database with Node.Mongodb Index Creation Unique Indexes
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Already on GitHub? Sign in to your account. This problem happened with my app, even with unique index at email, the mongoose permits that document complete the save action, for the same e-mail. This may be linked to It looks like the schema is set up wrong Ditto mattcasey 's comments. Also, double check in the mongo shell if the index is there or not. Try this:. Model emits an "index" event when its done building indexes code that contains any error that happened when building indexes, so if you're going to use mongoose for building indexes, I recommend you listen to that event and handle errors in a way that's appropriate for your application.
Please check User. MongoError: Index with name: id already exists with different options] name: 'MongoError', connectionId:err: 'Index with name: id already exists with different options', code: There doesn't seem to be much info in the documentation I have this:.
The code works if duplication is allowed, but mongodb throws an error when there's duplication, but I only see the error on the mongoDB log on my server and not in my application background addExistingToIndex exception E duplicate key error index: myDB. How come the on handler isn't picking up the error? The below code works fine for me:. I'm only listening to the 'index' event with coin.
I'm expecting it to print something but it doesn't print anything to the console.The exports object of the mongoose module is an instance of this class.
Most apps will only use this one instance. The Mongoose Decimal SchemaType. Used for declaring paths in your schema that should be bit decimal floating points. Do not use this to create a new Decimal instance, use mongoose. Decimal instead. The Mongoose Mixed SchemaType. Used for declaring paths in your schema that Mongoose's change tracking, casting, and validation should ignore. The Mongoose Number SchemaType. Used for declaring paths in your schema that Mongoose should cast to numbers.
Do not use this to create a new ObjectId instance, use mongoose. ObjectId instead. The Mongoose module's default connection. Equivalent to mongoose. This is the connection used by default for every model created using mongoose. To create a new connection, use createConnection. An array containing all connections associated with this Mongoose instance. By default, there is 1 connection. Calling createConnection adds a connection to this array.
Each connection instance maps to a single database. This method is helpful when mangaging multiple db connections. Removes the model named name from the default connection, if it exists. You can use this function to clean up any models you created in your tests to prevent OverwriteModelErrors.
The underlying driver this Mongoose instance uses to communicate with the database. A driver is a Mongoose-specific interface that defines functions like find.
Models defined on the mongoose instance are available to all connection created by the same mongoose instance. If you call mongoose. When no collection argument is passed, Mongoose uses the model name. If you don't like this behavior, either pass a collection name, use mongoose. The node-mongodb-native driver Mongoose uses. Mongoose uses this function to get the current time when setting timestamps. You may stub out this function using a tool like Sinon for testing.
Starts a MongoDB session for benefits like causal consistency, retryable writesand transactions.
Mongoose Unique index not working!
Calling mongoose. Sessions are scoped to a connection, so calling mongoose. When nesting schemas, children in the example abovealways declare the child schema first before passing it into its parent. Array of child schemas from document arrays and single nested subdocs and their corresponding compiled models. Each element of the array is an object with 2 properties: schema and model.If you haven't yet done so, please take a minute to read the quickstart to get an idea of how Mongoose works.
If you are migrating from 4. Everything in Mongoose starts with a Schema. Each schema maps to a MongoDB collection and defines the shape of the documents within that collection. If you want to add additional keys later, use the Schema add method. Each key in our code blogSchema defines a property in our documents which will be cast to its associated SchemaType. For example, we've defined a property title which will be cast to the String SchemaType and property date which will be cast to a Date SchemaType.
Notice above that if a property only requires a type, it can be specified using a shorthand notation contrast the title property above with the date property.
This will happen whenever a key's value is a POJO that lacks a bona-fide type property. In these cases, only the leaves in a tree are given actual paths in the schema like meta. A side-effect of this is that meta above cannot have its own validation. If validation is needed up the tree, a path needs to be created up the tree - see the Subdocuments section for more information on how to do this.
Also read the Mixed subsection of the SchemaTypes guide for some gotchas. Schemas not only define the structure of your document and casting of properties, they also define document instance methodsstatic Model methodscompound indexesand document lifecycle hooks called middleware.
To use our schema definition, we need to convert our blogSchema into a Model we can work with. To do so, we pass it into mongoose. Instances of Models are documents. Documents have many of their own built-in instance methods. We may also define our own custom document instance methods.
Now all of our animal instances have a findSimilarTypes method available to them. Arrow functions explicitly prevent binding thisso the above examples will not work because of the value of this. You can also add query helper functions, which are like instance methods but for mongoose queries. Query helper methods let you extend mongoose's chainable query builder API. MongoDB supports secondary indexes.
With mongoose, we define these indexes within our Schema at the path level or the schema level. Defining indexes at the schema level is necessary when creating compound indexes.
When your application starts up, Mongoose automatically calls createIndex for each defined index in your schema. Mongoose will call createIndex for each index sequentially, and emit an 'index' event on the model when all the createIndex calls succeeded or when there was an error.
While nice for development, it is recommended this behavior be disabled in production since index creation can cause a significant performance impact. Disable the behavior by setting the autoIndex option of your schema to falseor globally on the connection by setting the option autoIndex to false.
Mongoose will emit an index event on the model when indexes are done building or an error occurred. Virtuals are document properties that you can get and set but that do not get persisted to MongoDB. The getters are useful for formatting or combining fields, while setters are useful for de-composing a single value into multiple values for storage. But concatenating the first and last name every time can get cumbersome. And what if you want to do some extra processing on the name, like removing diacritics?
A virtual property getter lets you define a fullName property that won't get persisted to MongoDB. Now, mongoose will call your getter function every time you access the fullName property:. This includes the output of calling JSON. You can also add a custom setter to your virtual that will let you set both first name and last name via the fullName virtual.This would result in code that would try to write to a table sans a lookup to see if a record already exists and if there was an error, I would check the error code to figure out if the record already existed or if something else happened.
Fortunately, Mongoose our ODM of choice makes things very simple and you can define an index on individual fields as well as a compound index that spans multiple fields. I needed both and thought it was worth putting a post together about it as I had to root around for a bit to find what I was looking for. To add a unique index to a single column, we simply add a unique property to the field. Comment below if you think I should have went with indices instead of indexes for this particular post.
One of those things would be unique indexes. Single Field Unique Indexes To add a unique index to a single column, we simply add a unique property to the field. Did you enjoy this post? Cool if I slip into your inbox with more? Full posts, times per week:. Previous Post Next Post.Why don't my changes to arrays get saved when I update an element directly? I declared a schema property as unique but I can still save duplicates.
What gives? For example, if MongoDB doesn't already have a unique index on namethe below code will not error despite the fact that unique is true. However, if you wait for the index to build using the Model. MongoDB persists indexes, so you only need to rebuild indexes if you're starting with a fresh database or you ran db.
In a production environment, you should create your indexes using the MongoDB shell rather than relying on mongoose to do it for you. The unique option for schemas is convenient for development and documentation, but mongoose is not an index management solution. When I have a nested property in a schema, mongoose adds empty objects by default. This is a performance optimization. These empty objects are not saved to the database, nor are they in the result toObjectnor do they show up in JSON.
In order to support change detection on nested properties without incurring the overhead of running Object. Because mongoose needs to define getters and setters for nested. What causes this issue and how can I fix it? The only import syntax Mongoose supports is import mongoose from 'mongoose'.
The global Mongoose object stores types, global optionsand other important properties that Mongoose needs. Arrow functions handle the this keyword much differently than conventional functions. But mongoose gives me a CastError telling me that it can't cast an object to a string when I try to save a Holding with an asset object. Why is this? The type property is special in mongoose, so when you say type: Stringmongoose interprets it as a type declaration. In the above schema, mongoose thinks asset is a string, not an object.
Do this instead:. See this GitHub issue. It's a known issue but one that's exceptionally difficult to fix.This makes error handling much easier, since you will get a Mongoose validation error when you attempt to violate a unique constraintrather than an E error from MongoDB.
You can easily add validation for the unique constraints in this schema by applying the uniqueValidator plugin to your user schema:. Now when you try to save a user, the unique validator will check for duplicate database entries and report them just like any other validation error:.
When using findOneAndUpdate and related methods, mongoose doesn't automatically run validation. To trigger this, you need to pass a configuration object. For technical reasons, this plugin requires that you also set the context option to query. You can pass through a custom error message as part of the optional options argument:. For case-insensitive matches, include the uniqueCaseInsensitive option in your schema. Queries will treat john. Smith gmail.
Because we rely on async operations to verify whether a document exists in the database, it's possible for two queries to execute at the same time, both get 0 back, and then both insert into MongoDB. Outside of automatically locking the collection or forcing a single connection, there's no real solution. Git github. Keywords mongoose unique validator. Install npm i mongoose-unique-validator Downloads Weekly Downloads 18, Version 2. License MIT. Unpacked Size Total Files 5.
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