How can I update another model from current model?

[djo26]

Hi everyone, I have Posts that have Votes, and the Vote has a
percentage.  Every time a new Vote is added I want to calculate the
average percentage of all Votes of that particular Post and update the
Post average percentage. Besides a custom query I have no idea how to
do this in my model. Anyone else on here know?  I'm relatively new to
this so it might be simple, but I'm not sure how to do it right now.

Any help is appreciated.
thanks, dan

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[Robert P]

Perhaps the most efficient way of doing this is by storing the total
in your Posts model, which might even remove the need of a Votes
model. I'm presuming that when you say Votes have a percentage you
mean that each Votes score is on a range from 0 to 100.

If you add the columns "average_vote" (float) and "total_votes" (int)
to your Posts table then you can recalculate the average every vote
with the following equation:
new average = ((average vote * total votes) + new vote) / (total votes
+ 1)
and of course increment the total_votes column.

So the pseudocode for Post::addVote(score) is
    if post exists
        find average_vote and total_votes
        set average_vote to ((average_vote * total_votes) + score) /
(total_votes + 1)
        set total_votes to total_votes + 1


On Nov 4, 8:31 am, djo26 <djo2...@...> wrote:
> Hi everyone, I have Posts that have Votes, and the Vote has a
> percentage.  Every time a new Vote is added I want to calculate the
> average percentage of all Votes of that particular Post and update the
> Post average percentage. Besides a custom query I have no idea how to
> do this in my model. Anyone else on here know?  I'm relatively new to
> this so it might be simple, but I'm not sure how to do it right now.
>
> Any help is appreciated.
> thanks, dan
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[djo26]

yes I know how to perform the calculation, and yes I am storing it in
my Post model.  I do need a Vote model because I'm storing other
information as well for the Vote.  I did not mention this originally
because I was trying to keep my original post simple. What I'm trying
to figure out is how to update the Post model with the updated average
from a submit of the votes/add controller.  I have the Vote model
configured with a "belongsTo" relationship to the Post model but I'm
not sure how to actually update the Post with the new value.

thanks, dan


On Nov 4, 12:05 pm, Robert P <shiftyrobs...@...> wrote:

> Perhaps the most efficient way of doing this is by storing the total
> in your Posts model, which might even remove the need of a Votes
> model. I'm presuming that when you say Votes have a percentage you
> mean that each Votes score is on a range from 0 to 100.
>
> If you add the columns "average_vote" (float) and "total_votes" (int)
> to your Posts table then you can recalculate the average every vote
> with the following equation:
> new average = ((average vote * total votes) + new vote) / (total votes
> + 1)
> and of course increment the total_votes column.
>
> So the pseudocode for Post::addVote(score) is
>     if post exists
>         find average_vote and total_votes
>         set average_vote to ((average_vote * total_votes) + score) /
> (total_votes + 1)
>         set total_votes to total_votes + 1
>
> On Nov 4, 8:31 am, djo26 <djo2...@...> wrote:
>
> > Hi everyone, I have Posts that have Votes, and the Vote has a
> > percentage.  Every time a new Vote is added I want to calculate the
> > average percentage of all Votes of that particular Post and update the
> > Post average percentage. Besides a custom query I have no idea how to
> > do this in my model. Anyone else on here know?  I'm relatively new to
> > this so it might be simple, but I'm not sure how to do it right now.
>
> > Any help is appreciated.
> > thanks, dan

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[djo26]

I ended up just creating a stored procedure and call it from my
controller like:
 $this->Vote->query('CALL my_stored_proc_name('.$input_post_id.')');

I would rather do this in the model but I have no idea how to.

dan

On Nov 4, 12:41 pm, djo26 <djo2...@...> wrote:

> yes I know how to perform the calculation, and yes I am storing it in
> my Post model.  I do need a Vote model because I'm storing other
> information as well for the Vote.  I did not mention this originally
> because I was trying to keep my original post simple. What I'm trying
> to figure out is how to update the Post model with the updated average
> from a submit of the votes/add controller.  I have the Vote model
> configured with a "belongsTo" relationship to the Post model but I'm
> not sure how to actually update the Post with the new value.
>
> thanks, dan
>
> On Nov 4, 12:05 pm, Robert P <shiftyrobs...@...> wrote:
>
> > Perhaps the most efficient way of doing this is by storing the total
> > in your Posts model, which might even remove the need of a Votes
> > model. I'm presuming that when you say Votes have a percentage you
> > mean that each Votes score is on a range from 0 to 100.
>
> > If you add the columns "average_vote" (float) and "total_votes" (int)
> > to your Posts table then you can recalculate the average every vote
> > with the following equation:
> > new average = ((average vote * total votes) + new vote) / (total votes
> > + 1)
> > and of course increment the total_votes column.
>
> > So the pseudocode for Post::addVote(score) is
> >     if post exists
> >         find average_vote and total_votes
> >         set average_vote to ((average_vote * total_votes) + score) /
> > (total_votes + 1)
> >         set total_votes to total_votes + 1
>
> > On Nov 4, 8:31 am, djo26 <djo2...@...> wrote:
>
> > > Hi everyone, I have Posts that have Votes, and the Vote has a
> > > percentage.  Every time a new Vote is added I want to calculate the
> > > average percentage of all Votes of that particular Post and update the
> > > Post average percentage. Besides a custom query I have no idea how to
> > > do this in my model. Anyone else on here know?  I'm relatively new to
> > > this so it might be simple, but I'm not sure how to do it right now.
>
> > > Any help is appreciated.
> > > thanks, dan

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[MeanStudios]

Greetings djo26,

If you have access to the vote_id (which I'm assuming you do since it
should be stored in the posts table for each post) you just need to do
something like this:
$this->Post->Vote->id = $this->data['Post']['vote_id'];
That sets up the vote model so you can get that particular record from
the votes table, make your calculations and then re-save your data.

Then do something like
$voteData = $this->Post->Vote->read();

Do whatever with $voteData.

$this->Post->Vote->save($voteData);

Since you specified the Vote ID earlier, this will update the record
instead of make a new one.

I hope this is what you were looking for :).

Best Regards,
cody

On Nov 7, 1:03 pm, djo26 <djo2...@...> wrote:

> I ended up just creating a stored procedure and call it from my
> controller like:
>  $this->Vote->query('CALL my_stored_proc_name('.$input_post_id.')');
>
> I would rather do this in the model but I have no idea how to.
>
> dan
>
> On Nov 4, 12:41 pm, djo26 <djo2...@...> wrote:
>
> > yes I know how to perform the calculation, and yes I am storing it in
> > my Post model.  I do need a Vote model because I'm storing other
> > information as well for the Vote.  I did not mention this originally
> > because I was trying to keep my original post simple. What I'm trying
> > to figure out is how to update the Post model with the updated average
> > from a submit of the votes/add controller.  I have the Vote model
> > configured with a "belongsTo" relationship to the Post model but I'm
> > not sure how to actually update the Post with the new value.
>
> > thanks, dan
>
> > On Nov 4, 12:05 pm, Robert P <shiftyrobs...@...> wrote:
>
> > > Perhaps the most efficient way of doing this is by storing the total
> > > in your Posts model, which might even remove the need of a Votes
> > > model. I'm presuming that when you say Votes have a percentage you
> > > mean that each Votes score is on a range from 0 to 100.
>
> > > If you add the columns "average_vote" (float) and "total_votes" (int)
> > > to your Posts table then you can recalculate the average every vote
> > > with the following equation:
> > > new average = ((average vote * total votes) + new vote) / (total votes
> > > + 1)
> > > and of course increment the total_votes column.
>
> > > So the pseudocode for Post::addVote(score) is
> > >     if post exists
> > >         find average_vote and total_votes
> > >         set average_vote to ((average_vote * total_votes) + score) /
> > > (total_votes + 1)
> > >         set total_votes to total_votes + 1
>
> > > On Nov 4, 8:31 am, djo26 <djo2...@...> wrote:
>
> > > > Hi everyone, I have Posts that have Votes, and the Vote has a
> > > > percentage.  Every time a new Vote is added I want to calculate the
> > > > average percentage of all Votes of that particular Post and update the
> > > > Post average percentage. Besides a custom query I have no idea how to
> > > > do this in my model. Anyone else on here know?  I'm relatively new to
> > > > this so it might be simple, but I'm not sure how to do it right now.
>
> > > > Any help is appreciated.
> > > > thanks, dan
>
>

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