You would probably want to make a counter cache for tasks on the project
(you can find out more here:
http://api.rubyonrails.org/v4.1.1/classes/ActiveRecord/Associations/ClassMethods.html#method-i-belongs_to),
and additional when retrieving tasks from the database, when you know
you will need their project data, use eager loading (more here:
http://guides.rubyonrails.org/active_record_querying.html#eager-loading-associations).
Michał.
On 30.09.2014 05:15, Austin York wrote:
In a todo list-style app, I have the following ActiveRecord model method:
|
classTask<ActiveRecord::Base
# ...
defproject_name
project.tasks.length >0?"#{project.name} - #{name}":project.name
end
end
|
The idea is to provide additional project information if there are one
or more tasks on the project.
However, when invoked regularly on views this creates performance
concerns (especially with a growing data set).
What is the best way to optimize this query so that it doesn't create
N+1 query type issues when invoked from "each" loops in the view?
(Feel free to post answers on StackOverflow
<http://stackoverflow.com/questions/26112070/how-to-avoid-n1-queries-in-rails-each-loops>).
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