I found this cool little snippet of code somewhere on the internet. Anywhere you access an object in a view, adding the following will ensure the page doesn’t blow up:
<%= @object.association.variable rescue nil %>
Of course, you won’t know if you have an error now either.
June 7th, 2008 at 12:20 pm
On Line number 5 it is showing the following error
NoMethodError in Admin#admin
Showing app/views/admin/admin.rhtml where line #5 raised:
You have a nil object when you didn’t expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.each
Extracted source (around line #5):
1- Product Listing
2-
3-
<tr valign=”top” class=”ListLine”>
<img width=”60″ height=”70″ src=”"/>
’show’, :id => product %>
‘Edit’, :id => product %>
‘destroy’, :id => product}, :confirm => “Are you Sure??” %>
@product_pages.current.previous }
end %>
@product_pages.current.next }
end %>
‘new’ %>
December 31st, 2008 at 12:51 am
Check out this little snippet:
def carefully(default = nil)
begin
yield
rescue NoMethodError => e
raise unless e.message["You have a nil object"]
default
end
end
carefully { @object.association.variable }
It only rescues when it’s dereferencing a nil, rather than on any error. In view code, and aesthetically, I do sort of prefer yours though.
January 28th, 2009 at 12:02 am
Wow! Thank you very much!
I always wanted to write in my blog something like that. Can I take part of your post to my blog?
Of course, I will add backlink?
Regards, Your Reader
February 2nd, 2009 at 8:58 pm
Timur,
Sure you can take a snippet as long as you give credit back to here
February 5th, 2009 at 11:43 pm
Hello. Your site displays incorrectly in Opera, but content excellent! Thanks for your wise words =)
May 25th, 2009 at 5:59 am
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