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.