Collate Limited Field Document For Free

Collations in MongoDB MongoDB sorts strings using binary collation by default. The binary collation uses the ASCII standard character values to compare and order strings. Certain languages and locales have specific character ordering conventions that differ from the ASCII character values.

To use collation with the aggregate operation, pass the collation document in the options field, after the array of pipeline stages. The following example shows an aggregation pipeline on a collection that uses the default binary collation.

We can use the JavaScript toLowercase() method to convert the value to lowercase and perform case-insensitive searches. You can also use the toUppercase() . For example, we have a find query here which is set with the $where operator.

Collation allows users to specify language-specific rules for string comparison, such as rules for lettercase and accent marks. You can specify collation for a collection or a view, an index, or specific operations that support collation.

Collation Options Collation OptionDescriptionStrengthICU level of comparison. The default value is "tertiary". For more information on each level, see the ICU Comparison Levels . collationStrength() API Documentation8 more rows

By default, MongoDB creates a unique index on the _id field during the creation of a collection. The _id field is always the first field in the documents. If the server receives a document that does not have the _id field first, then the server will move the field to the beginning.

For example, a collation strength of 1 (primary) only considers the base characters, ignoring accents, case, punctuation, and other modifiers. A collation strength of 2 (secondary) also considers accents and diacritics, but still ignores case and punctuation.

Create a Collection with Collation Click the Create Collection button. From the Collections screen, click the Create Collection button. Enter the collection name. Click the Advanced Collection Options dropdown. ... Select a value for locale. ... Click Create Collection to create the collection.

MongoDB sorts strings using binary collation by default.

Collation allows users to specify language-specific rules for string comparison, such as rules for lettercase and accent marks. You can specify collation for a collection or a view, an index, or specific operations that support collation.