Pretty print an array with Ruby on Rails

Question

I have an object named Puzzle and I'm calling .map on it in order to isolate the 'title' values. I then use 'puts' in order to print them neatly but nothing is returned.

def puzzle_find
  title_array = self.puzzles.map { |s| s.title }
  puts title_array
end
#=> " "

If I don't use 'puts' then I get the array like this:

def puzzle_find
  title_array = self.puzzles.map { |s| s.title }
end  

#=> ["title 1", "title 2", "title 3"]

I'm trying to make the output look like this in my view:

title 1
title 2
title 3

thanks

The puzzle_find method should not be responsible for printing the array. Just return the array, and handle how you want to display it in the view. — Robin
– Robin, Commented Jan 22, 2012 at 20:31

Dave Newton · Accepted Answer · 2013-05-23 12:43:47Z

3

The collection of titles should be prepared in the controller (or exposed by the controller and retrieved in the model, or etc., as long as there's a collection of titles at the end of it all):

def controller_method
  @puzzles = ... whatever ...
  @titles = @puzzles.collect(&:title)
end

View:

<% @titles.each do |t| %>
  <%= t %><br/>
<% end %>

(Or wrap it up in a partial, or use a helper. Above assumes scrubbed of HTML badness.)

edited May 23, 2013 at 12:43

answered Jan 22, 2012 at 20:39

Dave Newton

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Comments

carpamon · Accepted Answer · 2012-01-22 20:22:11Z

1

title_array.each do |title|
  puts title
end

answered Jan 22, 2012 at 20:22

carpamon

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Comments

peterpengnz · Accepted Answer · 2012-01-22 20:22:49Z

1

Hi When you say "my view", I assume it is html.erb file.

Use join method to insert <br/> into your array:

def puzzle_find
  title_array = self.puzzles.map { |s| s.title }.join('<br/>')
end

If your "view" is about console outputs:

Use join method with \n:

def puzzle_find
  title_array = self.puzzles.map { |s| s.title }.join('\n')
end

Example in irb console:

ruby-1.8.7-p334 :001 > puts ["a","b","c"].join("\n")
a
b
c
=> nil

answered Jan 22, 2012 at 20:22

peterpengnz

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