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Applying a unique index to a single text field has unexpected behavior with spaces. OS: Windows 10 For example: Inserting "test co" and "test2 co" fail uniqueness. Inserting " co" and " co" fail uniqueness.
matherz831 commented on Mon, 21 May 2018 19:03:04 +0000: Thanks for the help Andy. You are right, this is not a bug, but user error. I should be just be indexing strings. As far as it possibly being a bug that mongodb allows the creation of a unique text index, I do see it possibly being useful when used with weights. You may close/delete the issue. schwerin commented on Fri, 18 May 2018 00:31:31 +0000: It may be a bug that we allow you to create a unique text index. A text index splits strings into tokens (words), and those tokens form the keys. So in your example, "co" is a duplicates key. Are you trying to build a text index, or just index strings? If the latter, you need to change your index spec.
Used the mongo shell on powershell. > use test switched to db test > db.testCol.createIndex( { "name": "text" } , { unique: true } ); { "createdCollectionAutomatically" : true, "numIndexesBefore" : 1, "numIndexesAfter" : 2, "ok" : 1 } > db.testCol.insert( {"name": "test co"} ) WriteResult( { "nInserted" : 1 }) > db.testCol.insert( {"name": "test2 co"}) WriteResult({ "nInserted" : 0, "writeError" : { "code" : 11000, "errmsg" : "E11000 duplicate key error collection: test.testCol index: name_text dup key: { : \"co\", : 0.75 }" } })
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