After I save a record in table A I want to save the id of that record in table B Immediatly

Rails
1

Hi all

I have two tables A and B
I have saved a record in table A and I want to save the id of that
record
in table B. How Can I do that.
Well I can do by search of same params which I save in Table A but I
feel
it is not that good approach.
If the app is has multiple users than that is not good way can any one
help
to do it better.

Thanks in Advance

2

On Sep 5, 2013, at 9:47 AM, honey ruby [email protected]
wrote:

Hi all

I have two tables A and B
I have saved a record in table A and I want to save the id of that record in
table B. How Can I do that.
Well I can do by search of same params which I save in Table A but I feel it is
not that good approach.

Just save it, then use the id :wink:

Seriously, this is a very common idiom, and you’ll find that rails takes
care of it.

–
Scott R.
[email protected]
http://www.elevated-dev.com/
(303) 722-0567 voice

3

On Sep 5, 2013, at 11:50 AM, Scott R. wrote:

Seriously, this is a very common idiom, and you’ll find that rails takes care of
it.

You may need to reload the object, as in

if @whatever.save
@whatever.reload
@another_thing.whatever_id = @whatever.id
@another_thing.save
end

That would only be true in a create method, because the ID isn’t known
until after the thing is saved. But if your relationships are declared
in the usual way (has_many, belongs_to, etc.) then this plumbing is
taken care of for you in most cases.

Walter

4

Thanks for your quick responses. Does I get the same id if I use
@whatever.reload.
if that model is accessed often and there are multiple users working on
same model and I want table A id to be saved as new record in table B
Table A
id name email
878 Sam [email protected]

as I save 878 record in Table A I want that 878 id to be saved as new
record in table B
Table B
id table_a_id
900 878

If in this scenario does reload helps me considering that there will me
more hits to Table A by multiple users.

5

On 5 September 2013 17:12, honey ruby [email protected]
wrote:

in table B
Table B
id table_a_id
900 878

As I suggested a little while ago when you first asked this question,
but did not reply to my response, you should consider doing this using
an association between the tables. Something like table_b belongs_to
table_a, table_a has_many table_bs. Then rails will do a lot of the
hard work for you. Almost always in rails if you are manipulating id
values then you are doing it wrong.

Colin

6

Thanks for the response Colin my last mail was deleted some how anyway
thanks for your reply. So If I use association between the tables

Table A Table B
has_many B and belongs_to A

now I save a new record to A
@table_a = TableA.save
@table_b = ?
what should be my next line so that id of that saved record will save in
Table B

And how should we approach this with out association if there is no
rails
only Ruby project

help me on this

7

On 5 September 2013 18:56, honey ruby [email protected]
wrote:

Table B
Really, you need to work through some good tutorials to get the basics
of rails. Also read the Rails Guides, in particular the one on
Associations.

And how should we approach this with out association if there is no rails
only Ruby project

Don’t know.

Colin