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Vitaliy Beliy 15 list through SOQL. 2 levels of hierarchy// Help please
Hello everyone,
I have 3 custom objects. Car__c, Service__c, Action__c,
I would really like to know how to get a list of all cars where Action__c.category = 'SOME VALUE'.
Link mapping looks like this
I have 3 custom objects. Car__c, Service__c, Action__c,
I would really like to know how to get a list of all cars where Action__c.category = 'SOME VALUE'.
Link mapping looks like this
Try the below ways:
I think it's not possible in single query.
Create the Formula fielld in Action Object to populate the Car Detail.
Formula Field (return type text) : Action > Service > Car.Id .
Then the below code snippet will help you to fetch the Car List :
set<Id> carIds = new set<Id>();
for(Action__c act : [Select Id, Name, Formula Field from Action__c where category =: 'Some Value' AND Formula Field != null ])
{
carIds.add(ID.ValueOf(act.Formula Field));
}
List<car__c> carList =[Select Id, Name from car__c where ID IN: carIds];
If you don't want to create the Formula Field then you can go with the any below approaches:
==================== OR ===============
List<car__c> carList = new List<car__c>();
for(car__c c : [Select Id,Name,(Select Id from Service__r where Id IN : (Select Service__c from Action__c where category =: 'Some Value')) from car__c] )
{
if(c.Service__r.size() > 0)
{
carList.add(c);
}
}
==================== OR ==============
List<car__c> carList = new List<car__c>();
Set<Id> carSet = new set<Id>();
for(Service act : [Select car__c from Service__c where ID IN: (Select Service__c from Action__c where category =: 'Some Value'))])
{
carSet.add(act.car__c);
}
carList = [Select Id,Name from car__c wher Id IN: carSet];
==================== OR ==============
List<car__c> carList = new List<car__c>();
Set<Id> serSet = new set<Id>();
Set<Id> carSet = new set<Id>();
for(Action__c act: [Select Service__c from Action__c where category =: 'Some Value'])
{
serSet.add(act.Service__c);
}
for(Service ser : [Select car__c from Service__c where ID IN: serSet)])
{
carSet.add(act.car__c);
}
carList = [Select Id,Name from car__c wher Id IN: carSet];
Thanks,
Maharajan.C
All Answers
Try the below ways:
I think it's not possible in single query.
Create the Formula fielld in Action Object to populate the Car Detail.
Formula Field (return type text) : Action > Service > Car.Id .
Then the below code snippet will help you to fetch the Car List :
set<Id> carIds = new set<Id>();
for(Action__c act : [Select Id, Name, Formula Field from Action__c where category =: 'Some Value' AND Formula Field != null ])
{
carIds.add(ID.ValueOf(act.Formula Field));
}
List<car__c> carList =[Select Id, Name from car__c where ID IN: carIds];
If you don't want to create the Formula Field then you can go with the any below approaches:
==================== OR ===============
List<car__c> carList = new List<car__c>();
for(car__c c : [Select Id,Name,(Select Id from Service__r where Id IN : (Select Service__c from Action__c where category =: 'Some Value')) from car__c] )
{
if(c.Service__r.size() > 0)
{
carList.add(c);
}
}
==================== OR ==============
List<car__c> carList = new List<car__c>();
Set<Id> carSet = new set<Id>();
for(Service act : [Select car__c from Service__c where ID IN: (Select Service__c from Action__c where category =: 'Some Value'))])
{
carSet.add(act.car__c);
}
carList = [Select Id,Name from car__c wher Id IN: carSet];
==================== OR ==============
List<car__c> carList = new List<car__c>();
Set<Id> serSet = new set<Id>();
Set<Id> carSet = new set<Id>();
for(Action__c act: [Select Service__c from Action__c where category =: 'Some Value'])
{
serSet.add(act.Service__c);
}
for(Service ser : [Select car__c from Service__c where ID IN: serSet)])
{
carSet.add(act.car__c);
}
carList = [Select Id,Name from car__c wher Id IN: carSet];
Thanks,
Maharajan.C
1.I've gone through your requirement and you can go reverse in the hierarchy (i.e. go from child to parent because in this type we can access up to 5 levels)
2. Below is the example of how to map Action__c with Car__c.
(Note---> there should be Master-Detail Relationship)
Apex Code--->
Map<id,List<Action__c>> CarIdVSActionMap=new Map<id,List<Action__c>>();
for(Action__c action:[select id,Service__c.CarID__c from Action__c
where Service__c.CarID__c!=null ])
{
if(CarIdVSActionMap.containskey(action.Service__c.CarID__c))
{
CarIdVSActionMap.get(action.Service__c.CarID__c).add(action);
}
else
{
CarIdVSActionMap.put(action.Service__c.CarID__c,new List<Action__c>());
CarIdVSActionMap.get(action.Service__c.CarID__c).add(action);
}
}
I hope you find the above solution helpful. If it does, please mark as Best Answer to help others too.
Thanks and Regards,
Deepali Kulshrestha
www.kdeepali.com