Counter Cache for a column with conditions?

Question

I am new to the concept of counter caching and with some astronomical load times on one of my app\'s main pages, I believe I need to get going on it.

Most of the coun

Answer 1

With regards to the conditions with counter_cache, I would read this blog post.

The one thing you should do is add the following to the migration file:

 add_column :employees, :projects_count, :integer, :default => 0, :null => false

 Employee.reset_column_information

 Employee.all.each do |e|
   Employee.update_counters e.id, :projects_count => e.projects.length
 end

So you current projects count can get migrated to the new projects_count that are associated with each Employee object. After that, you should be good to go.