pdoFetch examples anyone? - My Forums

pdoFetch examples anyone?

alipang — Oct 31, 2018, 08:15 PM

I'm writing a script for listing users. I use ClassExtender to store extra fields and information about which fields the user wants to disclose. I'm familiar with getCollectionGraph, but because I want to use pdoPage and get best speed I think pdoFetch would be best. Does anyone know of a good snippet to learn from and be willing to share?

Re: pdoFetch examples anyone?

andreer — Nov 19, 2018, 08:37 PM

OP, did you fix the issue?

Re: pdoFetch examples anyone?

alipang — Nov 04, 2018, 12:44 PM

A sidenote: I still don't get the paging right, but I think I know why. The pdoPage snippet relies on

$total = (int)$modx->getPlaceholder($totalVar);

That is probably a trick (preferred way?) to pass a number between pdoPage and the element used, but in my case something else intercepts the placeholder.

Re: pdoFetch examples anyone?

BobRay — Nov 04, 2018, 03:17 AM

@Hans Svensson: That looks really good. What most people do is get all the resources, then loop through them to get the related objects, which obviously means many, many queries to the DB. Your method gets everything in a single query.

@mrhaw: I'm glad I could help.

Re: pdoFetch examples anyone?

mrhaw — Nov 04, 2018, 03:03 AM

Quote from: BobRay at Oct 31, 2018, 08:44 PM

You've seen this, right?

https://docs.modx.pro/en/components/pdotools/classes/pdofetch

WOW!! Thanks!! 8-)

Re: pdoFetch examples anyone? (Best Answer)

alipang — Nov 03, 2018, 02:14 PM

Bob! You were quoted in a thread I just read:
Quote from: BobRay

If (and it's a big if) you've properly created the tables as related objects of each other, you can use getCollectionGraph() to get them all in a single query. You can also use $query->leftJoin() with getCollection().

That was what I was missing. Lesson learned: getCollectionGraph() is handy through it's use of model definitions, but with some extra typing getCollection() can do the job too.

After examining the pdoTools code I figured out how to do it. No need to make a new snippet. pdoUsers has it all.

[[!pdoPage?
    &element=`pdoUsers`
    &leftJoin=`[{"class":"userData", "alias": "userData", "on":"userData.userdata_id = modUser.id"}]`
    &select=`{"userData": "firstName, lastName"}`
    &loadModels=`{'extendeduser': MODX_CORE_PATH.'components/classextender/model/'}`
    &toPlaceholder=`userlist`
    &tpl=`userItem`
    &tplWrapper=`usersWrapper`
    &setTotal=`1`
    &totalVar=`total`
    &showInactive=`0`
    &showBlocked=`0`
    &showLog=`1`
]]
[[!+userlist:notempty=`[[!+userlist]][[!+page.nav]]`]]

Re: pdoFetch examples anyone?

BobRay — Nov 02, 2018, 08:11 PM

I tend to write custom code for stuff like that, so I haven't used pdoTools much at all. Your question makes more sense to me now that I know that pdoFetch is a class that you can extend or replace for use with any of the pdoTools snippets.

Can pdoResources and pdoUsers handle extended data?

I'd say definitely yes, but I don't know how to do it. That said, it's more complicated since ClassExtender's classes do not extend modUser and modResource. So, IIRC, the resource and the user (and maybe the profile) are related objects of the class extender objects, but not the other way around.

There's an example here, that does a join, but I think it's untested.

You probably know this, but ClassExtender has getExtUser and getExtResources snippets that may do what you want. If they don't, you can duplicate them and modify them to meet your needs. You can also look at them as examples of how to get related object data for users and resources.

Re: pdoFetch examples anyone?

alipang — Nov 02, 2018, 03:48 PM

If I rephrase it as "How to get paged result with pdoTools from any data with related objects"?

Can pdoResources and pdoUsers handle extended data? There are &loadModels and &class parameters, but how do I use them for example with ClassExtender?

BTW, pdoTools is not necessary, but it would be nice to master it.

Re: pdoFetch examples anyone?

BobRay — Nov 02, 2018, 04:58 AM

I'm not sure I understand your question. The topic is pdoFetch, but you're asking about getCollectionGraph().

As far as I know there is a $pdo->getCollection, but there's no $pdo->getCollectionGraph().

$modx->getCollectionGraph() is quite fast and efficient in my experience, so even if you could somehow do the equivalent with pdoTools, I don't think you'd save much time unless you're querying massive amounts of data.

Re: pdoFetch examples anyone?

alipang — Oct 31, 2018, 09:24 PM

Yes. I think I can get getCollection working, but I was thinking more about getCollectionGraph. Some way of doing

$c = $modx->newQuery('userData');
$c->where(array('User.active' => '1'));
$users = $modx->getCollectionGraph('userData', '{"Profile":{},"User":{}}', $c);

if we speak about ClassExtender. But it would be nice to know how to use it for any class.