10 votes
Accepted

SOQL Best Practices with Multiple Junction Objects

Salesforce Object Query Language (SOQL) does not support JOIN operations that SQL does. The reason for this is the multi-tenant nature of the Force.com platform. https://developer.salesforce.com/page/...
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  • 2,183
6 votes

How to avoid duplicate look up combination in many to many relationship?

You can create a Unique field (Unique_Course_Student_Relationship__c) on the junction object and populate it with a concatenation of StudentId and CourseId through a record-triggered flow on create. ...
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5 votes
Accepted

Creating custom object for class roster that would pull a list from contacts

For the above problem, I would suggest creating new Custom object, that will act as a Junction object between Roaster and Contacts. It will have look-up fields to Contact object and Roaster object. ...
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5 votes
Accepted

SOQL from a junction record?

Here is one way: Id accountId = ...; Covenant__c[] covenants = [ select Id, Name, ... from Covenant__c where Id in ( select Covenant__c from ...
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  • 131k
4 votes
Accepted

Find record based on two (or more) variables

One solution is to use the technique illustrated in this answer. It amounts to adding a formula field to the objects that you are relating to each other that combines the various fields. You can then ...
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  • 131k
4 votes

How do Junction Objects - Many To Many Relationships - work?

To create Many-to-Many relationship you need Junction object(as you mentioned in your question). Lets take Opportunity and Product for example to explain this. If you want Opportunity A should have ...
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4 votes

What is security access for child record when master is private

The first master-detail relationship you create on your junction object becomes the primary relationship. This affects the following for the junction object records: Look and feel: The junction ...
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  • 5,557
4 votes

DML Insert List of Child Records and Junction Records in a single DML Statement

Using the Unit of Work pattern backed up by the fflib-apex-common GITHUB library, you can delegate most of this work and make your coding somewhat simpler UnitOfWork will insert objects in a user-...
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  • 63k
3 votes

How do Junction Objects - Many To Many Relationships - work?

Ultimately, the best way to understand how these relationships work, is to try to create one in your Sandbox. This Salesforce Documentation is the only guide you need to follow. But this may be ...
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  • 2,256
3 votes

How do Junction Objects - Many To Many Relationships - work?

It may be worth creating a Developer Org if you haven't already and checking out the Force.com Platform Fundamentals guide which will take you through creating a recruitment application for a pseudo-...
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  • 7,047
3 votes

How do Junction Objects - Many To Many Relationships - work?

Salesforce supports 2 kinds of relationships like Master Detail and Lookup. They are both one-to-many relationship, and they are both defined from the many-to-one side, that is from a child to a ...
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  • 1,308
3 votes

Junction object scenario

Look at the following image I found on search engine: Here a team member is related to project. So there can be two scenarios: A team member can be related to multiple project A project can have ...
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  • 22.3k
3 votes
Accepted

Compare Junction Object List with its Master-Objects lists

This is a good use case for leveraging an External ID field on the Catalog_Product__c object. The value that is contained in this field will be comprised of two keys concatenated together to create a ...
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  • 22.4k
3 votes
Accepted

Redirecting to Parent object when saving a related list object

The trick is to set the saveUrl or the retUrl to the Id of the object you want the user to return. Is there a saveURL URL parameter set? If so, redirect to that. Is there a retURL URL parameter set? ...
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  • 3,182
3 votes

How to access Junction Object fields

If C is your junction object then C has a reference to an A and a reference to a B So in SOQL you could write something like thingC__c anExampleC = [select my_thing_A__r.thing_A_field__c, ...
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  • 11.3k
3 votes

How to access Junction Object fields

You should read through this Relationship Queries documentation that amongst other things explains the use of __r references. If you have these custom objects: A__c B__c C__c the field reference ...
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  • 131k
3 votes
Accepted

Insufficient Privilege error while creating a record

You might have demanded for permissions more than what is required for CRUD on junction object CI__c. Relation: CI__c(Jn) -> C__c(Master-Detail), I__c(Master-Detail) Check the field ...
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  • 2,406
3 votes

Junction object in Salesforce

Junction object is to achieve Many-to-Many relationship model in Salesforce. It means that each record can be associated with many records using the Junction object which keeps the reference of ...
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  • 22.3k
3 votes

is a SOQL subquery with a junction object possible?

You can try something like this. Select Id,Name,(select Id,ContactId,Contact.Name from OpportunityContactRoles) from Opportunity
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  • 13.3k
3 votes

Query to Include Child Junction Records - Didn't Understand Relationship

You can find the name of the ChildRelationship as follows: for (ChildRelationship relation : SObjectType.Contact.getChildRelationships()) if (relation.getChildSObject() == Contact.sObjectType) ...
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  • 144k
3 votes

Can you create a 3 way many to many relationship between objects?

What you're describing is a junction object. A junction object is the third object which represents a many-to-many relationship between two other objects. Your Group object would be a junction object ...
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  • 87.4k
2 votes
Accepted

Mandatory to create Junction object?

You can use the existing objects and relationships e.g. like this: select Id, ... from ShipmentLine__c where Shipment__c in (select Shipment__c from OrderLines__c where Id = :orderLineId) order by ......
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  • 131k
2 votes
Accepted

Help with a junction object

It's Opportunity.Field__c and not Opportunity__r.Field__c. If you are on the same object, you don't even have to specify the object type. Another thing is, if your formula field is of a type string, ...
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2 votes

How do I deprecate/delete a master object part of a junction object which is part of a managed package?

In general, your ability to change or delete things once included in a managed package is severely limited. Full details are available in the ISVForce Guide, specifically check out pages 20-38, which ...
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2 votes

Need a good design pattern for junction objects

I would create separate many-to-many objects, any other solution would also remove standard many-to-many features as you can only create 2 master-detail relationships. Sure you could have a custom ...
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2 votes
Accepted

Lookup filter based on sibling objects

I think I get the essence of what you're trying to do but I don't think you can achieve this without adjusting your data model. First, I'm assuming your current data model is something like this: ...
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  • 2,564
2 votes
Accepted

Including fields from related object in a junction object view?

Sounds like you need to use Cross Object Lookup Formulas: https://help.salesforce.com/HTViewHelpDoc?id=customize_cross_object.htm&language=en_US With these, you can add fields to the junction ...
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2 votes
Accepted

List not empty after deletion

I believe the delete statement deletes the records from database, but it will not clear the list collection in memory. so to see if the records got deleted or not, you have to query them again and ...
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2 votes
Accepted

Junction object in Salesforce

I disagree with the "common knowledge" on this issue. I have run into use-cases where using a Lookup relationship instead is appropriate. The junction object is a more flexible concept than people ...
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  • 144k
2 votes
Accepted

Proper way to implement Junction Object from SQL tables

Your data model in Salesforce won't be any different than what you've currently got documented in the image in your question. If you want to load data into this junction object structure, you're ...
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  • 22.4k

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