CODEWITHSUNDEEP
ruby-on-railsruby
Doboy
Doboy

Reputation: 11082

updating model's association when association gets add/removed

I have a model Foo which :has_many bars, initially I create and save a Foo instance called foo. Looking at foo.bars it is empty as expected. But after I create a bar instance that belongs to the foo instance. foo.bars should no longer be empty but it still it. If I do Foo.find(foo.id).bars it returns a non-empty result as expected. Is there a way to update foo so that I don't have to do that. Thanks!

Upvotes: 0

Views: 63

Answers (2)

stfcodes
stfcodes

Reputation: 1380

That's probably happening because of caching.

foo = Foo.create! #=> executes sql, and caches the result
foo #=> retrieved from cache
foo.bars << Bar.create #=> creates the bar, and associates it with the foo instance
foo.bars #=> retrieves the bars from cache, so it's []
Foo.find(foo.id).bars #=> executes sql, and returns [<bar# id: 1>]

To get around that, you just create a new instance of foo, or just reload it:

foo.reload

Or, foo.bars(true).

Upvotes: 2

Faisal
Faisal

Reputation: 18988

The problem is that foo.bars would have been cached by the first call. You can force it to refresh using foo.bars(true)

Upvotes: 0

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