How to convert an array to comma delimited string using ruby

Question

This is one example.

(Category.find(:all,:select => "name").collect {|c| c.name}).join(', ') 

It generates:

 "Category1, Category2" 

Is there any other, more efficient + cleaner way to do this?

Answer 1

The problem is that you are trying to join the attribute of the objects, not the objects themselves. Gathering is the best way I know this. But I would use the to_sentence method to_sentence Rails provides the conversion of arrays exactly like this:

 Category.find(:all,:select => "name").collect { |c| c.name }.to_sentence 

Answer 2

No, your decision looks quite normal.

You can only drop parentheses to join .

Answer 3

Array.pluck will put it in an array of strings for you. Big savings will not lead to the creation of Ruby ActiveRecord objects when you do not need them.

 Category.pluck(:name).join(", ") Category.pluck(:name).to_sentence