Rails - Sep 2013 - After I save a record in table A I want to save the id of that record in table B Immediatly

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

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On Sep 5, 2013, at 9:47 AM, honey ruby
<emailtohoneyruby-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 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 ;-)

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



-- 
Scott Ribe
scott_ribe-ZCQMRMivIIdUL8GK/JU1Wg@public.gmane.org
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(303) 722-0567 voice




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On Sep 5, 2013, at 11:50 AM, Scott Ribe wrote:
> On Sep 5, 2013, at 9:47 AM, honey ruby
<emailtohoneyruby-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 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 ;-)
> 
> 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

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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         sam-J9XYGKgEagdBDgjK7y7TUQ@public.gmane.org


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.


On Thu, Sep 5, 2013 at 9:25 PM, Walter Lee Davis
<waltd-HQgmohHLjDZWk0Htik3J/w@public.gmane.org> wrote:
>
> On Sep 5, 2013, at 11:50 AM, Scott Ribe wrote:
>
> > On Sep 5, 2013, at 9:47 AM, honey ruby
<emailtohoneyruby-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> 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 ;-)
> >
> > 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
>
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>
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On 5 September 2013 17:12, honey ruby
<emailtohoneyruby-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> 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         sam-J9XYGKgEagdBDgjK7y7TUQ@public.gmane.org
>
>
> 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
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

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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



On Thu, Sep 5, 2013 at 10:07 PM, Colin Law
<clanlaw-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:
> On 5 September 2013 17:12, honey ruby
<emailtohoneyruby-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > 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         sam-J9XYGKgEagdBDgjK7y7TUQ@public.gmane.org
> >
> >
> > 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
>
> 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
>
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On 5 September 2013 18:56, honey ruby
<emailtohoneyruby-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> 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
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
>
> help me on this
>
>
>
> On Thu, Sep 5, 2013 at 10:07 PM, Colin Law
<clanlaw-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:
>>
>> On 5 September 2013 17:12, honey ruby
<emailtohoneyruby-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> > 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         sam-J9XYGKgEagdBDgjK7y7TUQ@public.gmane.org
>> >
>> >
>> > 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
>>
>> 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
>>
>> --
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Groups
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>>
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>
>
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