Ruby/Rails 3: Turning a set of object attributes into an array

Question

@video = Video.find(params[:id])

@lengths = @video.each do |i|
  @length = i.length * 60
end

Firstly, I presumed @video would have an each, but instead got this error:

undefined method `each' for #<Video:0x4738428>

Secondly, is there any Ruby one-liner magic that could substitute for the last 3 lines?

Pizzicato · Accepted Answer · 2011-03-12 15:55:38Z

4

@video is not an array in this case, it is an object because you asked the Video model to return only one video, the one with the id given in the params array.

In case you want to retrieve all videos from the database, do this:

@video = Video.all

Now @video will be an array of video objects.

answered Mar 12, 2011 at 15:55

Pizzicato

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1 Comment

Dale Campbell Over a year ago

Also, if you just want a single Video object but as an array, just do this: @videos = [Video.find(params[:id])]

fengolly · Accepted Answer · 2011-03-12 16:32:55Z

1

Pizzicato answered your question just fine, but here's my two cents:

If you would like to know the class of an object, you can do:

p Video.find(params[:id]).class

answered Mar 12, 2011 at 16:32

fengolly

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