How do I fix E11000 duplicate key collection?

How do I fix E11000 duplicate key collection?

You essentially have three options:

1. Drop the collection. db.users.drop();
2. Find the document which has that value and delete it. Let’s say the value was null, you can delete it using: db.users.remove({ email_address: null });
3. Drop the Unique index: db.users.dropIndex(indexName)

What is duplicate key error in MongoDB?

MongoDB’s E11000 error is a common source of confusion. This error occurs when two documents have the same value for a field that’s defined as unique in your Mongoose schema. Mongoose models have an _id field that’s always unique. If you try to insert two documents with the same _id , you get the below error message.

How do you avoid duplicate keys in SQL?

We have better options.

1. Adding the Distinct Keyword to a Query to Eliminate Duplicates. The first option is to use DISTINCT in your SELECT.
2. Using SQL WHERE NOT IN to Remove Duplicate Values.
3. Using INSERT INTO WHERE NOT IN SQL Operator.
4. Using SQL INSERT INTO IF NOT EXIST.
5. Using COUNT(*) = 0 Without Duplicates.

How do I update multiple values in MongoDB?

In MongoDB, you can update multiple documents in the collection using db. collection. updateMany() method.

1. updateMany() method can be used in the multi-document transactions.
2. When you update your documents the value of _id field in not change.
3. It also adds new fields in the documents.

Why is there duplicate key error in MongoDB?

The reason behind this error is that. The index is not present in your collection, in which you are trying insert the record. So Solution is – Drop that collection and run your program again.

Why is there an error message in MongoDB?

The error message is saying that there’s already a record with null as the email. In other words, you already have a user without an email address. If a document does not have a value for the indexed field in a unique index, the index will store a null value for this document.

How to get rid of duplicate Index in MongoDB?

Check with mydb.users.getIndexes () if this is the case and manually remove the unwanted index with mydb.users.dropIndex ( ). If you are still in your development environment, I would drop the entire db and start over with your new schema.

Why does unique indexing not work in MongoDB?

Unique Indexing (compound or not) will not work if there any record that violates the new desired indexing, even if you drop all your indexes and retry to reIndex as I mentioned before. The reason behind this error is that. The index is not present in your collection, in which you are trying insert the record.