Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

checking nil object

Posted on 2007-11-15
2
Medium Priority
?
680 Views
Last Modified: 2012-06-21
hi,

I am wondering if there is smart/elegant ways of checking nil object.

I have this in controller:

 @attending_ip = AttendingIp.find_by_sql("SELECT .....")

In view:

<% if @attending_ip != nil%>
<% @attending_ip.each do |u|  %>
...
...

<%if u.admit_date != nil%><%= u.admit_date.to_formatted_s(:my_format_0)  %><%end%>

...
...

I am checking  whether u.admit_date is nil otherwise, it throws error message since admit_date can be null. So, do I always have to check for all the columns? Are there better ways of doing this?

thx,
0
Comment
Question by:dkim18
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 19

Accepted Solution

by:
peh803 earned 1400 total points
ID: 20294959
With ruby, there is always a better way :-)

Try this...just a little bit cleaner.

Regards,
Phil
<%= u.admit_date.to_formatted_s(:my_format_0) if u.admit_date %>

Open in new window

0
 

Author Closing Comment

by:dkim18
ID: 31409416
Ok, that is good enough. thx!
0

Featured Post

[Webinar] Lessons on Recovering from Petya

Skyport is working hard to help customers recover from recent attacks, like the Petya worm. This work has brought to light some important lessons. New malware attacks like this can take down your entire environment. Learn from others mistakes on how to prevent Petya like worms.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Article by: narshlob
If you've ever programmed in Ruby and have come across either a proc or a lambda, you might have been wondering what the difference is between the two and when you would use one over the other. This article will try to explain the difference between…
Recently I spent hours debugging an issue in a Rails project where ActiveRecord was causing MySQL errors trying to create a User object of a class at the top level of a Single Table Inheritance model structure.  It turns out `.create` behaves differ…
Sometimes it takes a new vantage point, apart from our everyday security practices, to truly see our Active Directory (AD) vulnerabilities. We get used to implementing the same techniques and checking the same areas for a breach. This pattern can re…
We’ve all felt that sense of false security before—locking down external access to a database or component and feeling like we’ve done all we need to do to secure company data. But that feeling is fleeting. Attacks these days can happen in many w…
Suggested Courses

715 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question