Question

Understanding relationship queries in Salesforce SOQL

Asked by: bakum

Hi,

I have a custom object, Logistics_Event__c, which has a field which is a lookup to another custom object, Course__c. (I'm doing this with the PHP toolkit, by the way)

I want to query my Logistics Events and return fields from Course__c: Name and Version__c.

I've tried two ways with no luck:
SELECT
            l.Id,
            l.Start_Date__c,
            l.Number_of_Days__c,
            l.Location__c,
            Course__r.Name,
            Course__r.Version__c
            FROM Logistics_Event__c l

Gives me no error, but doesn't return any info.  There is not ALWAYS a course ID on the Logistics_Event__c record, but there is about 50% of the time.  I would have thought it would return nothing sometimes and the field data when there's data to return.

I also tried this way:
SELECT
            l.Id,
            l.Start_Date__c,
            l.Number_of_Days__c,
            l.Location__c,
            (SELECT Name, Version__c FROM Course__c)
            FROM Logistics_Event__c l

ERROR: Didn't understand relationship 'Course__c' in FROM part of query call

Can someone illuminate me?

Thanks!

-mb

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Asked On
2008-07-21 at 14:10:00ID23583426
Tags

Salesforce.com

,

Salesforce.com API

,

Salesforce.com SOQL

Topic

CRM Software

Participating Experts
2
Points
500
Comments
4

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    Answers

     

    by: MonkeyPushButtonPosted on 2008-07-21 at 15:59:14ID: 22055177

    Could you post the PHP code that processes the output of this query please?

     

    by: pauldesatadvologixdotcomPosted on 2008-07-21 at 16:19:11ID: 22055288

    The first try you had should work. If you look at the query you wrote you reference cours__r. Shouldn't it be course__c? You can check the API name field value by looking at the object in Salesforce.

    Here is an example that works in API calls if you want to test

    select contact.firstname, contact.lastname, account.billingcity from contact
    where contact.firstname = 'John'

     

    by: bakumPosted on 2008-07-22 at 09:43:14ID: 22061196

    I attached a PHP snippet.  

    As for Course__r vs. Course__c, the docs say you should use __r instead of __c when specifying a relationship in a query.  However, just for grins I tried __c and it didn't work.  Same error.  

    Driving me nuts...

    $query = "SELECT
            l.Id,
            l.Start_Date__c,
            l.Number_of_Days__c,
            l.Location__c,
            Course__r.Name,
            Course__r.Version__c
            FROM Logistics_Event__c l";
 
		echo "<!-- $$$$$ query = ".$query." -->";
		
		try 
		{
		$options = new QueryOptions(2000);    
		$mySforceConnection->setQueryOptions($options);
		$queryResponse = $mySforceConnection->query($query);
		$queryResult = new QueryResult($queryResponse);
 
	    if ($queryResult->size == 0) return FALSE;
				
		$records = $queryResult->records;
		
		$total_number_of_updates = 0;
		
		foreach ($records as $record) 
		{
		   $eventID = (string)$record->Id;
		   //grab the event type so that we can classify events now,
		   //in order to spit them out later clustered together by event type
 
			foreach($record->fields as $key => $value)
			{
				$event[$eventID][$key] = (string)$value;
				$event[$eventID]['theater']=$theater;
				$event[$eventID]['acronym']=$acronym;				
				$event[$eventID]['type']=$type;
			}
			if ($record->sobjects)
			{
				foreach ($record->sobjects as $subrecords)
				{
					for ($i=0; $i++; $i < count($record->sobjects))
					{
						foreach($record->sobjects[$i]->fields as $key => $value)
						{
							$event[$eventID][$key] = (string)$value;
						}
					}
				}
			}
		}
		
		
		
		}
		catch (Exception $e)
		{
			print_r($mySforceConnection->getLastRequest());
			echo $e->faultstring;
		} 
		
		return $event;

                                              
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    by: bakumPosted on 2008-07-22 at 10:26:32ID: 22061605

    turns out the first way was the right way, I was iterating through the results incorrectly.  Partial points!

    20120131-EE-VQP-002

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