#115 Model Caching (revised)

Wow Hilarious :)

I had a basic question. How can I cache static files that users have uploaded? I am using CarrierWave to upload the files which are hosted on S3, but every time I fetch them, it takes a very long time.

Check out https://github.com/cpuguy83/pack_rat for some cache helpers in your model

Here's another gem with similar model caching functionality https://github.com/schneems/method_cacheable

When would you use this vs cache_digests?

2:34 to 3:03. Those two sentences makes no sense to me whatsoever. I've listened to it 10 times, and I can't tell what that line does. Sometimes the "foobar" terminology is unhelpful.

"So, if we pass a model object to the fetch method it's going to automatically use the cache key for that object, and we can supply multiple keys in an array and they will be joined together. So let's say we have some kind of property we want to compute on that article, we can execute that in a block here and this block will be executed just once when it sets the key and the next time we trigger it it won't trigger the block because the key is already set unless we change the Article model and that will change the key value."

Here is the line Ryan is describing:

Rails.cache.fetch([article, "foo"]) { 123 }

which returns:

=> 123

then he types it in the console again, and the same thing happens. What does this line do again? And what does "123" do? And how do I know that it isn't triggered the second time?

How is any fetching done when nothing in the cache had been set yet? I am really missing something on this one.

Another great cast.

I have a semi unrelated question being a bit of a rails newbie. I notice all the Model functions being defined as self.function_name

I have seen this done both with self and without self and also with variables being defined both with and without self. What is the right way? They both seem to work.

try also find_cache gem https://github.com/mustafaturan/find_cache
- support for rails 3+ including rails 4
- catches your find_by attribute methods
- catches your belongs_to relation
- catches your has_one relations
- threading supported

dynamically expires cache when thread killed or with an after_filter on application controller

Great cast but I noticed we had to write many methods.
When I checked identity_cache gem, I have also to write fetch_xxx

Is there any gem cache by default everything without need to change my old code to use fetch_xxx?
I need a gem to use without changing my code and have to replace all finds with fetches.

I found some gems like
https://github.com/ngmoco/cache-mone --not working on Rails3--
https://github.com/orslumen/record-cache
https://github.com/csdn-dev/second_level_cache

Can anyone give suggestions/recommendations?

What tool do you use to see the number of queries done ? on the top left Windows ?

I do this with Redis using redis-objects: https://github.com/nateware/redis-objects

Hi Guys,
Not sure how scalable model caching is?
In a sense, it looks like we are building a "cached mini DB"..
in a scenario with thousands (or millions) of records , you will end up requiring more and more memory.

You're saying multiple times that the cached values are expired, that's a bit false I think.
The cache key changes and there is no cached value with the new key, but the cached value with the old key is still cached in there. It can grow big if not expired from time to time.

How about model caching and I18N (translation).
Is there an easy way to cache content of a multilanguage site?

Another great cast.

Caching the comments count only seems to work with a page reload. I am using ajax to add comments and updating the count in create.js.erb: $('#comments_count').html('<%= @article.comments.size %>'); ... when using the cached version the value is not yet updated at this point?

I've found the after_touch method a good place to clear the cache too

after_commit :flush_cache
after_touch :flush_cache

Another awesome cast - I love how in the end there are no queries!

Ryan, even though there haven't been any Railscasts for a while, I keep referring back to these and they've saved me so many times. Thanks!

Hope all is going well on your hiatus.

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I should find some way to do the syntax highlighting only once and store that version on S3.

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2:34 to 3:03. Those two sentences makes no sense to me whatsoever. I've listened to it 10 times, and I can't tell what that line does. Sometimes the "foobar" terminology is unhelpful.

"So, if we pass a model object to the fetch method it's going to automatically use the cache key for that object, and we can supply multiple keys in an array and they will be joined together. So let's say we have some kind of property we want to compute on that article, we can execute that in a block here and this block will be executed just once when it sets the key and the next time we trigger it it won't trigger the block because the key is already set unless we change the Article model and that will change the key value."

Here is the line Ryan is describing:

Rails.cache.fetch([article, "foo"]) { 123 }

which returns:

=> 123

then he types it in the console again, and the same thing happens. What does this line do again? And what does "123" do? And how do I know that it isn't triggered the second time?

How is any fetching done when nothing in the cache had been set yet? I am really missing something on this one.

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