Mongodb text index Duplicate Key Error when part of string field same

问题

For examples:

doc1:

{
'name':'apple'
}

doc2:

{
'name':'apple juice'
}

when I create text index with pymongo:

db.products_collection.create_index([('name', TEXT)],
                                     unique=True,
                                    background=True)

it give me an error:

E11000 duplicate key error collection: c.items_collection index: name_text_alias_text dup key: { : "apple", : 10.5 }

Some one know why? I cannot add unique=True for text string?

回答1:

A text index splits strings into tokens (words), and those tokens form the keys. So in your example, "apple" is a duplicates key.

Generally, unique text index is the bad idea.

来源：https://stackoverflow.com/questions/41499611/mongodb-text-index-duplicate-key-error-when-part-of-string-field-same