Mongoid ignores collection.insert if at least one duplicate exists

问题

I have a unique index setup, with drop_dup: true

index({ key1: 1, key2: 1 }, { unique: true, drop_dups: true })

When inserting multiple records, I would like the non-duplicates to succeed, similar to MySQL's

INSERT IGNORE INTO table ...

.. or even INSERT INTO table ... ON DUPLICATE KEY UPDATE

So if I have a record:

Model.collection.insert({'key1'=>'not-unique', 'key2'=>'boo'})

It seems that the following call doesn't do anything.

Model.collection.insert(

{'key1'=>'not-unique', 'key2'=>'boo'},

{'key1'=>'im-unique', 'key2'=>'me-too'}

)

Is there a way to at least insert {'key1'=>'im-unique', 'key2'=>'me-too'} on the 2nd call?

Thanks!

回答1:

It appears that you are looking for insert batch with continue_on_error and not single document update/upsert of which I think you are already informed.

http://api.mongodb.org/ruby/current/Mongo/Collection.html#insert-instance_method

With the 10gen driver, an equivalent of your example with a User model would be:

Gemfile

gem 'mongo'
gem 'bson_ext'

test/unit/user_test.rb (excerpt)

col = Mongo::Connection.new['sandbox_test']['users']
col.insert({'key1'=>'not-unique', 'key2'=>'boo'})
assert_equal(1, User.count)
col.insert([{'key1'=>'not-unique', 'key2'=>'boo'},{'key1'=>'im-unique', 'key2'=>'me-too'}], :continue_on_error => true)
assert_equal(2, User.count)

The above works in a simple unit test.

Mongoid 3 uses the Moped driver instead of the 10gen driver. In the 1.1.6 gem that you are using, moped does not support options / flags, but Durran added flags to the insert method circa July 28 in github.

https://github.com/mongoid/moped/commit/2c7d6cded23f64f436fd9e992ddc98bbb7bbdaae

https://github.com/mongoid/moped/commit/f8157b43ef0e13da85dbfcb7a6dbebfa1fc8735c

As of mongoid 3.0.3 with moped 1.2.0, the following insert batch with continue_on_error works.

Model.collection.insert([{'key1'=>'not-unique', 'key2'=>'boo'},{'key1'=>'im-unique', 'key2'=>'me-too'}], [:continue_on_error])

Note that the primary parameter to the insert method for batch insert is an Array object enclosed in square brackets - the square brackets are missing from your post.

Hope that this helps.

来源：https://stackoverflow.com/questions/11752991/mongoid-ignores-collection-insert-if-at-least-one-duplicate-exists

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mongoid