Solved

checking nil object

Posted on 2007-11-15
2
677 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 350 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

On Demand Webinar - Networking for the Cloud Era

This webinar discusses:
-Common barriers companies experience when moving to the cloud
-How SD-WAN changes the way we look at networks
-Best practices customers should employ moving forward with cloud migration
-What happens behind the scenes of SteelConnect’s one-click button

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
radio buttons to display list of options  - rails app 4 361
String to Hex for UDP packet 1 961
What is File vs !File in Ruby 3 389
git - conflict 5 228
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…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…

710 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