问题
In my app I created a recent posts feature.
@recentposts = Post.all(:order => 'created_at DESC', :limit => 5)
This variable makes some trouble. When I run tests I have the following error:
DEPRECATION WARNING: Relation#all is deprecated. If you want to eager-load a relation, you can call #load (e.g.
Post.where(published: true).load). If you want to get an array of records from a relation, you can call #to_a (e.g.Post.where(published: true).to_a). (called from show at /home/mateusz/rails4/Bloggers/app/controllers/users_controller.rb:18)
I was seraching solution on Google but I don't find it...
回答1:
Just write:
@recentposts = Post.order('created_at DESC').limit(5)
The to_a is not explicitly necessary, as the data is lazy loaded when needed.
回答2:
A call to Post.all will return an ActiveRecord::Relation, which will be loaded lazily by default. Calling Post.all.load will return an eagerly-loaded ActiveRecord::Relation. Finally, calling Post.all.to_a will return all records in an array.
In your case you would do:
Post.order('created_at DESC').limit(5).to_a
which would return an array of the first 5 Posts, sorted by created_at in descending order.
回答3:
Nested way
Post.order('created_at DESC').limit(5).to_a
来源：https://stackoverflow.com/questions/18203712/rails-4-relationall-deprecation