ruby on rails - Best practice for displaying data the user might not have -

I got Ruby on Rail App where I do the following:

  @ User = User.find (: first,: conditions => ['lower (user name) =' ', current_ subdomain. Downcount] ,: = include:> bio)  

: Included =>: Bio 'is the important part.

Then in the scene, I want to display some bio:

   & Lt;% = @user .bio.title% & gt; & Lt; / Em> & Lt; Br / & gt; & Lt;% = @ user.bio.city% & gt; & Lt; Br / & gt; & Lt;% = @ user.bio.state% & gt; & Lt; Br / & gt; & Lt;% = @ user.bio.country% & gt;  

But if the user does not have any information then it will replace some blank lines.

I have tried some different things, no one has worked so far ...

  & lt;% if @ user.bio.title% & Gt; # Is always correct & lt;% if @ user.bio.title & gt; 0% & gt; # Triggers an error if @ user.bio.title is not set & lt;% as long as @ user.bio.title.empty? & Gt%;  

Like the above

Any solution to display data to the user?

Thanks in advance!

Update

OK, if there are some things to locate:

  & lt;% if @ user .bio.title% & gt; # Works if bio is not set at all. & Lt;% if @ user.bio.title & gt; 0% & gt; # Works if bio set.  

So I can use a sollution that looks:

  & lt;% if @ user.bio.title% & gt; & Lt;% If the user is .bio.title & gt; '0'% & gt; & Lt;% = @ user.bio.title% & gt; & Lt;% end% & gt; & Lt;% end% & gt;  

But does it seam a bit more? Any better suggestions?

Thank you!

One way to think about this is by the user has a bio and in the title field Is full. In Ruby:

  & lt;% if @ user.bio & amp; Amp; !@user.bio.blank? & Gt%;  

If you are going to display multiple fields of bio, then you can separate it in 2 checks eg.

  & lt;% if @ user.bio% & gt; & Lt;% as long as @ user.bio.title.blank? & Gt%; Title: & lt;% = @ user.bio.title% & gt; & Lt;% end% & gt; & Lt;% as long as @ user.bio.other_field.blank? & Gt%; Other fields: & lt;% = @ user.bio.other_field% & gt; & Lt;% end% & gt; & Lt;% end% & gt;  

Optional

Another method is to put methods on your model to provide direct access to bio areas. For example

  # Return the user's title or zero if a bio-DRT title is bio.title if bio end  

then you just do this Can:

  & lt;% as long as user.title.blank? & Gt%; Title: & lt;% = @ user.title% & gt; & Lt;% end% & gt;