Using rails helper method

Question

I've found a helper method that I would like to use to resize embedded videos on my site. I've tried using this method several ways but received multiple undefined method errors. Here's the method:

def resize_video(new_width,new_height)
    width,height = embed_code.match(/width=.?(\d+).*height=.?(\d+)/).to_a.drop(1)
    embed_code.gsub(width,new_width).gsub(height,new_height)
end

I would like to apply this method to the <%= raw link.embed_code %> portion of my view, available HERE, to change the width and height to the desired values. Where should I put the method and how should it be called?

Update

Per Karel's advice, I put the method in links_helper.rb and used <%= raw (link.embed_code).resize_video %> in the view but received this error undefined method resize_video for #<String:0x492bf40>

nkm · Accepted Answer · 2011-10-23 16:03:39Z

1

I would suggest you to put the helper method in the corresponding helper of the view(ie. if the view file belongs a controller xyz, there should be a helper with name xyz_helper). This is the rails convention. If the helper method is used in multiple controller views, we can put it in application_helper.

If you are getting undefined method for embed_code, we have to pass that variable as follows

<%= raw resize_video(link.embed_code, width, height) %>
def resize_video(embed_code, new_width, new_height)
  width,height = embed_code.match(/width=.?(\d+).*height=.?(\d+)/).to_a.drop(1)
  embed_code.gsub(width,new_width).gsub(height,new_height)
end

answered Oct 23, 2011 at 16:03

nkm

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3 Comments

Dru Over a year ago

Thanks, now I'm getting this undefined method resize_video for #<#<Class:0x4a6bfb0>:0x4a69610> I've tried so many different ways, could this be a rails 3.1 issue?

nkm Over a year ago

I have not worked on rails 3.1 yet, but i don't think this could be a rails 3.1 issue. Most probably this could be because of broken code in the helper file or not probably loading the helper. If link is a model instance, then you may put the above code in a model method and call it from the view.

Dru Over a year ago

I winded up putting it directly in the controller, it's my first iteration and I'm not very specific about HOW it gets done. I just needed the feature. I used your modified function. Thanks!

Karel Frajták · Accepted Answer · 2011-10-23 15:42:43Z

0

Place your helper methods in a file name video_helper.rb in helpers folder. More here.

answered Oct 23, 2011 at 15:42

Karel Frajták

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