Question

I am creating a XML file of image urls, and I have to parse this URL when I am writing out the XML.

Some rows in the database don’t have a URL, so how do I skip those rows and don’t process?

Something like:

images = Image.limit(100)

images.each { |i|

  blah = ''

  if i.url ???
    # process stuff here
  else
      blah = ''
  end


}

Answer 1

If it’s a SQL database, I’d use a query that skipped rows with missing URLs:

 select * from database_table where url is not null

or something similar to that. Database queries differ depending on the database.

Otherwise, in Ruby I’d do something like:

if (i.url.any?)
    ...
else
    ...
end

or:

if (!i.url.empty?)...