Sending a code block to a find_all dynamic method

Question

I'm working with some complex queries using the dynamic find_all method and reached to a point where sending a block to that find_all method would really simplify my code.

Is there any plugin or work in-progress dealing with this?

In simple terms, I'd like to do something like:

@products = Product.find_all_by_ids(ids, .....) do |p|
            # do something to each product like      
            p.stock += 10
          end

Obviously, any other guide or better way of doing this would be greatly appreciated.

Answer 1

I use the .each method which Enumerable provides like

@products = Product.find_all_by_ids(ids, .....)
@products.each { |p| p.stock += 10 }

There are even some extensions to Enumerable that Rails provides that might help you a bit if you're doing some common stuff.

Also, don't forget to save your objects with something like p.save if you want the changes to actually persist.

Answer 2

Rails 2.3 introduced the find_in_batches and find_each methods (see here) for batch processing of many records.

You can thus do stuff like:

  Person.find_each(:conditions => "age > 21") do |person|
    person.party_all_night!
  end

Answer 3

What's wrong with this:

@products = Product.find_all_by_ids(ids).each do |p| 
  p.stock+=10
 end

In case you didn't know, each returns the array passed to it.