@@identity

Ruby
1

I can’t seem to find any resources which tell me how to do the
following. When I write some content to a table in my database (mysql),
I want to retrieve the id of the newly inserted record; an equivalent of
select @@IDENTITY from sometable. How can I do this in ruby?

In my code, I have a hash:

params[:customer] = row.to_hash
@customer = @asset.customers.build(params[:customer])

now I want to store, in table x, the id of this record which was just

inserted into the customers table.

2

doesn’t anyone know how to retrieve the id of the last inserted record,
using ruby?

3

For Mrperfect wrote:

doesn’t anyone know how to retrieve the id of the last inserted record,
using ruby?

It’s not that, it’s that no-one tends to respond quickly to folk who
don’t
bother to use Google. Look at the following link, and show the source of
“insert”:

http://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/SQLServerAdapter.html#M000779

To learn more, you might need to check out the ActiveRecord source code
using svn.

4

First off, thanks for your reply. If it’s the case the people haven’t
responded to my question for thinking that I haven’t googled, I think
think they’re a bunch of stuck-ups!!! I did search but hadn’t found my
answer. I even went through the trouble of signing up for an account,
on here, just to ask this question!! I’m new to ruby.

I installed the activesupport gem but now I’m getting the error:

undefined method `execute’

I get the impression that this adapter is for ms sql server. would it
work with mysql as well?

Clifford H. wrote:

For Mrperfect wrote:
It’s not that, it’s that no-one tends to respond quickly to folk who
don’t
bother to use Google. Look at the following link, and show the source of
“insert”:

5

Alex Y. wrote:

You want a:

customer = @asset.customers.create(params[:customer])

following which, customer.id will have the ID of the customer record as
inserted into the customers table.

–
Alex

GREAT! Thanks, Alex!

6

For Mrperfect wrote:

First off, thanks for your reply. If it’s the case the people haven’t
responded to my question for thinking that I haven’t googled, I think
think they’re a bunch of stuck-ups!!!
It’s also worth mentioning that your initial request and follow-up were
within two hours of each other, in the middle of the night (for me).
It’s somewhat unreasonable to expect an answer in that timeframe,
especially when the answer to your problem is actually in the official
docs.

I did search but hadn’t found my
answer.
It’s worth mentioning that, because the assumption otherwise will be
that you haven’t.

I even went through the trouble of signing up for an account,
on here, just to ask this question!! I’m new to ruby.

I installed the activesupport gem but now I’m getting the error:

undefined method `execute’

I get the impression that this adapter is for ms sql server. would it
work with mysql as well?
If you’re using ActiveRecord (not sure why you need activesupport for
this), then it’s taken care of automatically. In any case, your problem
isn’t getting the last inserted ID, because this code:

customer = @asset.customers.build(params[:customer])

doesn’t save the customer, according to the docs here:
http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#M000658.

You want a:

customer = @asset.customers.create(params[:customer])

following which, customer.id will have the ID of the customer record as
inserted into the customers table.

–
Alex