Can Two Active Record Results be Added?

[Jorg Lueke]

I have an sql with some inputs,notably a date.  For that date I run
the sql and get a result

@result = Model.find_by_sql(sql)

What I want is to have eight versions of this (different dates in the
sql) and then combine all the results and pass them back once to the
view.  Is that possible?
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[Jorg Lueke]

On Jul 24, 8:09 am, Jorg Lueke <jlueke_2...@...> wrote:
> I have an sql with some inputs,notably a date.  For that date I run
> the sql and get a result
>
> @result = Model.find_by_sql(sql)
>
> What I want is to have eight versions of this (different dates in the
> sql) and then combine all the results and pass them back once to the
> view.  Is that possible?

Yes it is
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[Pardee, Roy]

If you can come up w/SQL that will return > 1 record, find_by_sql (like all the other find* methods) should return an array of instances of your model w/out any extra work on your part.

-----Original Message-----
From: rubyonrails-talk@... [mailto:rubyonrails-talk@...] On Behalf Of Jorg Lueke
Sent: Thursday, July 24, 2008 7:22 AM
To: Ruby on Rails: Talk
Subject: [Rails] Re: Can Two Active Record Results be Added?




On Jul 24, 8:09 am, Jorg Lueke <jlueke_2...@...> wrote:
> I have an sql with some inputs,notably a date.  For that date I run
> the sql and get a result
>
> @result = Model.find_by_sql(sql)
>
> What I want is to have eight versions of this (different dates in the
> sql) and then combine all the results and pass them back once to the
> view.  Is that possible?

Yes it is


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[Jorg Lueke]

In this case that would be a lot harder than creating the instances
multiple times and adding them together.  Though it's likely more
efficient to do it all on the backend, doing procedural logic in SQL
isn't very clean.  If ActiveRecord supported stored procs it would
make it easier.  Of course some people think all logic, even data
logic,belongs outside the data layer.

On Jul 24, 12:13 pm, "Pardee, Roy" <parde...@...> wrote:

> If you can come up w/SQL that will return > 1 record, find_by_sql (like all the other find* methods) should return an array of instances of your model w/out any extra work on your part.
>
>
>
> -----Original Message-----
> From: rubyonrails-talk@... [mailto:rubyonrails-talk@...] On Behalf Of Jorg Lueke
> Sent: Thursday, July 24, 2008 7:22 AM
> To: Ruby on Rails: Talk
> Subject: [Rails] Re: Can Two Active Record Results be Added?
>
> On Jul 24, 8:09 am, Jorg Lueke <jlueke_2...@...> wrote:
> > I have an sql with some inputs,notably a date.  For that date I run
> > the sql and get a result
>
> > @result = Model.find_by_sql(sql)
>
> > What I want is to have eight versions of this (different dates in the
> > sql) and then combine all the results and pass them back once to the
> > view.  Is that possible?
>
> Yes it is- Hide quoted text -
>
> - Show quoted text -

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[Pardee, Roy]

Huh--can you not pass a "exec my_cool_sproc" to find_by_sql?

But if you've just got a set of dates to cycle through, can't you just stash those in an in() list?  In fact, I wouldn't be surprised if you could just pass an array of DateTimes to Model.find_by_my_date_field.  I know the plain Model.find will take an array of IDs...

-----Original Message-----
From: rubyonrails-talk@... [mailto:rubyonrails-talk@...] On Behalf Of Jorg Lueke
Sent: Thursday, July 24, 2008 10:21 AM
To: Ruby on Rails: Talk
Subject: [Rails] Re: Can Two Active Record Results be Added?


In this case that would be a lot harder than creating the instances multiple times and adding them together.  Though it's likely more efficient to do it all on the backend, doing procedural logic in SQL isn't very clean.  If ActiveRecord supported stored procs it would make it easier.  Of course some people think all logic, even data logic,belongs outside the data layer.

On Jul 24, 12:13 pm, "Pardee, Roy" <parde...@...> wrote:

> If you can come up w/SQL that will return > 1 record, find_by_sql (like all the other find* methods) should return an array of instances of your model w/out any extra work on your part.
>
>
>
> -----Original Message-----
> From: rubyonrails-talk@...
> [mailto:rubyonrails-talk@...] On Behalf Of Jorg Lueke
> Sent: Thursday, July 24, 2008 7:22 AM
> To: Ruby on Rails: Talk
> Subject: [Rails] Re: Can Two Active Record Results be Added?
>
> On Jul 24, 8:09 am, Jorg Lueke <jlueke_2...@...> wrote:
> > I have an sql with some inputs,notably a date.  For that date I run
> > the sql and get a result
>
> > @result = Model.find_by_sql(sql)
>
> > What I want is to have eight versions of this (different dates in
> > the
> > sql) and then combine all the results and pass them back once to the
> > view.  Is that possible?
>
> Yes it is- Hide quoted text -
>
> - Show quoted text -

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[Jorg Lueke]

exec doesn't work in DB2.  I can pass a call.  That seems to work but
not if there's output parms "uncaught throw `Column information cannot
be retrieved:"  Something to explore a little later.  One could also
write a UDF.

An in list would work the way you describe but in this case it's
basically a concatenation of  the sql statement with each different
date.  On 7/28 5 employees might be on PTO on 8/4 maybe 7.  Each date
needs to be tested.



On Jul 24, 12:48 pm, "Pardee, Roy" <parde...@...> wrote:

> Huh--can you not pass a "exec my_cool_sproc" to find_by_sql?
>
> But if you've just got a set of dates to cycle through, can't you just stash those in an in() list?  In fact, I wouldn't be surprised if you could just pass an array of DateTimes to Model.find_by_my_date_field.  I know the plain Model.find will take an array of IDs...
>
>
>
> -----Original Message-----
> From: rubyonrails-talk@... [mailto:rubyonrails-talk@...] On Behalf Of Jorg Lueke
> Sent: Thursday, July 24, 2008 10:21 AM
> To: Ruby on Rails: Talk
> Subject: [Rails] Re: Can Two Active Record Results be Added?
>
> In this case that would be a lot harder than creating the instances multiple times and adding them together.  Though it's likely more efficient to do it all on the backend, doing procedural logic in SQL isn't very clean.  If ActiveRecord supported stored procs it would make it easier.  Of course some people think all logic, even data logic,belongs outside the data layer.
>
> On Jul 24, 12:13 pm, "Pardee, Roy" <parde...@...> wrote:
> > If you can come up w/SQL that will return > 1 record, find_by_sql (like all the other find* methods) should return an array of instances of your model w/out any extra work on your part.
>
> > -----Original Message-----
> > From: rubyonrails-talk@...
> > [mailto:rubyonrails-talk@...] On Behalf Of Jorg Lueke
> > Sent: Thursday, July 24, 2008 7:22 AM
> > To: Ruby on Rails: Talk
> > Subject: [Rails] Re: Can Two Active Record Results be Added?
>
> > On Jul 24, 8:09 am, Jorg Lueke <jlueke_2...@...> wrote:
> > > I have an sql with some inputs,notably a date.  For that date I run
> > > the sql and get a result
>
> > > @result = Model.find_by_sql(sql)
>
> > > What I want is to have eight versions of this (different dates in
> > > the
> > > sql) and then combine all the results and pass them back once to the
> > > view.  Is that possible?
>
> > Yes it is- Hide quoted text -
>
> > - Show quoted text -- Hide quoted text -
>
> - Show quoted text -

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[Pardee, Roy]

Ahhh--okay.  I get it now.  Well, at least the ruby isn't too painful to write--something like:

def self.find_unavailable_by_dates(array_of_dates)
  results = []
  array_of_dates.uniq!.sort!
  array_of_dates.each do |this_date|
    sql = "blah blah blah #{this_date}"
    results << self.find_by_sql(sql)
  end
  results
end

Should do it I'd think...

-----Original Message-----
From: rubyonrails-talk@... [mailto:rubyonrails-talk@...] On Behalf Of Jorg Lueke
Sent: Thursday, July 24, 2008 11:41 AM
To: Ruby on Rails: Talk
Subject: [Rails] Re: Can Two Active Record Results be Added?


exec doesn't work in DB2.  I can pass a call.  That seems to work but not if there's output parms "uncaught throw `Column information cannot be retrieved:"  Something to explore a little later.  One could also write a UDF.

An in list would work the way you describe but in this case it's basically a concatenation of  the sql statement with each different date.  On 7/28 5 employees might be on PTO on 8/4 maybe 7.  Each date needs to be tested.



On Jul 24, 12:48 pm, "Pardee, Roy" <parde...@...> wrote:

> Huh--can you not pass a "exec my_cool_sproc" to find_by_sql?
>
> But if you've just got a set of dates to cycle through, can't you just stash those in an in() list?  In fact, I wouldn't be surprised if you could just pass an array of DateTimes to Model.find_by_my_date_field.  I know the plain Model.find will take an array of IDs...
>
>
>
> -----Original Message-----
> From: rubyonrails-talk@...
> [mailto:rubyonrails-talk@...] On Behalf Of Jorg Lueke
> Sent: Thursday, July 24, 2008 10:21 AM
> To: Ruby on Rails: Talk
> Subject: [Rails] Re: Can Two Active Record Results be Added?
>
> In this case that would be a lot harder than creating the instances multiple times and adding them together.  Though it's likely more efficient to do it all on the backend, doing procedural logic in SQL isn't very clean.  If ActiveRecord supported stored procs it would make it easier.  Of course some people think all logic, even data logic,belongs outside the data layer.
>
> On Jul 24, 12:13 pm, "Pardee, Roy" <parde...@...> wrote:
> > If you can come up w/SQL that will return > 1 record, find_by_sql (like all the other find* methods) should return an array of instances of your model w/out any extra work on your part.
>
> > -----Original Message-----
> > From: rubyonrails-talk@...
> > [mailto:rubyonrails-talk@...] On Behalf Of Jorg Lueke
> > Sent: Thursday, July 24, 2008 7:22 AM
> > To: Ruby on Rails: Talk
> > Subject: [Rails] Re: Can Two Active Record Results be Added?
>
> > On Jul 24, 8:09 am, Jorg Lueke <jlueke_2...@...> wrote:
> > > I have an sql with some inputs,notably a date.  For that date I
> > > run the sql and get a result
>
> > > @result = Model.find_by_sql(sql)
>
> > > What I want is to have eight versions of this (different dates in
> > > the
> > > sql) and then combine all the results and pass them back once to
> > > the view.  Is that possible?
>
> > Yes it is- Hide quoted text -
>
> > - Show quoted text -- Hide quoted text -
>
> - Show quoted text -

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