Couldn't find User with ID=1

Rails
1

Is there a method to use instead of model.find(id) that returns nil if
nothing is found - meaning there is no id that matches?

2

David M. wrote:

Is there a method to use instead of model.find(id) that returns nil if
nothing is found - meaning there is no id that matches?

Model.find(:first)

or Model.find(:all).last

3

Thanks, but this is not what I am looking for. There is a possibility
that the record I am searching for has been destroyed. For example,
user with id = 1 has been deleted, but they posted a comment. I still
want to display the comment and I want to show the users name if they
still exist. Is there a method that looks for that id and returns the
appropriate one if found and returns nil if it doesn’t exist without
crashing?

Jeremy W. wrote:

David M. wrote:

Is there a method to use instead of model.find(id) that returns nil if
nothing is found - meaning there is no id that matches?

Model.find(:first)

or Model.find(:all).last

4

David M. wrote:

Is there a method to use instead of model.find(id) that returns nil if
nothing is found - meaning there is no id that matches?

Model.find_by_id(1)

5

David M. wrote:

Is there a method to use instead of model.find(id) that returns nil if
nothing is found - meaning there is no id that matches?

The #find method will do what you ask if you call it the right way:

User.find(1) # raises error if no user with ID 1
User.find(:first, :conditions => { :id => 1 }) # returns nil if no user
with ID 1
User.find(:all, :conditions => { :id => 1 }) # returns empty array if
no user with ID 1

And the dynamic finder does what you want too:

User.find_by_id(1) # returns nil if no user with ID 1
User.find_all_by_id(1) # returns empty array if no user with ID 1

I’ve never been a fan of the kitchen-sink nature of the #find method. It
seems like three different methods to me.

–
Josh S.
http://blog.hasmanythrough.com

6

Yep, just rescue from the exception if it occurs like this

begin
@m = Model.find(id)
rescue ActiveRecord::RecordNotFound
#do something here if you want to
end

if @m
#do stuff with @m
else
#do stuff without @m
end

Hope this helps ya.

7

David M. wrote:

Is there a method to use instead of model.find(id) that returns nil if
nothing is found - meaning there is no id that matches?

foo = Model.find(id) rescue nil

–Al Evans

8

On Sun, 2007-16-09 at 02:53 +0200, David M. wrote:

Is there a method to use instead of model.find(id) that returns nil if
nothing is found - meaning there is no id that matches?

Try: model.find_by_id(id)

–
Rick
[email protected]

9

Danny is correct as well, both will work depending on what you are
trying to do. I had forgotten that find_by_* dynamic finders returned
nil.

10

Personally I end up using this option a good deal:
User.find(:first, :options=>{:id=> 1})

When you know that you’re looking for just one instance it’s simply
easier to test for nil than to test for an empty array.

On Sep 16, 7:18 pm, Josh S. [email protected]

11

Danny B. wrote in post #554031:

David M. wrote:

Is there a method to use instead of model.find(id) that returns nil if
nothing is found - meaning there is no id that matches?

Model.find_by_id(1)

Worked perfectly for me! :smiley: Thanks!