N+1 queries basics Free
Just enough fundamentals to be fluent preloading associations with ActiveRecord, and start helping your team to avoid n+1 queries on production.
Read moreJust enough fundamentals to be fluent preloading associations with ActiveRecord, and start helping your team to avoid n+1 queries on production.
Read moreMaster n+1 queries identification, preloading, counts and counter caches, and eliminate n+1 queries from your code.
Read moreImagine that you are creating a record (let’s say a tweet), and on creation, you want to add the tweet to the page and also update the tweets count in the page…
But you want to update the content, not just for the current user, but for all the users...
Read moreDo you want to build powerful admin interfaces with little code, but you are not sure if you want to jump into a full admin solution like Active Admin, Administrate or Avo?
Here I want to show you an alternative!
A step by step guide to build a dynamic...
Read moreHave you ever needed to get the most recent N posts for each user in rails, but didn’t know how to do it without using map?
Or maybe something similar like:
Have you ever needed to get the most recent N posts for each user in rails, but didn’t know how to do it?
Or maybe something similar like:
Have you ever wanted to just create an active record example to someone in your team without thinking in the database setup?
Or maybe send two different models designs with some examples to see the difference, but the setup what just to difficult...
Read moreDisplay the count of an association could look like a simple task, but in some cases it can give you real troubles.
It is very easy to end with n+1 queries. Counting with ruby sometimes can be ok, but sometimes could be impossible. Counting via sql...
Read moreHave you ever needed to get the most recent post for each user in rails, but didn’t know how to do it without using map?
Or maybe something similar, like:
Sometimes calculating the count of a collection on every page render, even in SQL, is not the best option.
Imagine that you need to render a post, with its count of likes and comments, but the post has thousands of likes and comments. That would be...
Read moreMaybe you have heard about the counter cache feature.
A counter cache makes finding the number of belonging objects more efficient by keeping a column with the count.
Rails makes it easy to implement it, but is not free. Sometimes it may be better...
Read moreMaybe you have heard about the counter cache feature.
It makes finding the number of belonging objects more efficient, by keeping a column with the count.
But… When should you use it? Do you need to have a counter cache for every association count...
Read more