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Fix: MongoDB Robomongo: db.data.find(β¦).collation is not a function?
The collation introduced in version MongoDB 3.4. Maybe, you implemented collation in a previous version.
For our example, we are using MongoDB version 4.0.5. Following is the query to check the current version on system −
> db.version()
This will produce the following output −
4.0.5
Let us first create a collection with documents −
> db.collationExample.createIndex({Value: 1}, {collation: {locale: "en", strength: 1}});
{
"createdCollectionAutomatically" : true,
"numIndexesBefore" : 1,
"numIndexesAfter" : 2,
"ok" : 1
}
> db.collationExample.insertOne({'Value':'x'});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e038a3cf5e889d7a51994f5")
}
> db.collationExample.insertOne({'Value':'X'});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e038a48f5e889d7a51994f6")
}
> db.collationExample.insertOne({'Value':'Y'});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e038a49f5e889d7a51994f7")
}
> db.collationExample.insertOne({'Value':'a'});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e038a49f5e889d7a51994f8")
}
> db.collationExample.insertOne({'Value':'á'});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e038a4bf5e889d7a51994f9")
}Following is the query to display all documents from a collection with the help of find() method −
> db.collationExample.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5e038a3cf5e889d7a51994f5"), "Value" : "x" }
{ "_id" : ObjectId("5e038a48f5e889d7a51994f6"), "Value" : "X" }
{ "_id" : ObjectId("5e038a49f5e889d7a51994f7"), "Value" : "Y" }
{ "_id" : ObjectId("5e038a49f5e889d7a51994f8"), "Value" : "a" }
{ "_id" : ObjectId("5e038a4bf5e889d7a51994f9"), "Value" : "á" }Here is the query to use COLLATION() −
> db.collationExample.find({ Value: "a" } ).collation( { locale: "en", strength: 1 } );This will produce the following output −
{ "_id" : ObjectId("5e038a49f5e889d7a51994f8"), "Value" : "a" }
{ "_id" : ObjectId("5e038a4bf5e889d7a51994f9"), "Value" : "á" }
Updated on: 27-Mar-2020
68 Views
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