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/...
- 2,193
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.
...
- 20.6k
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.
...
- 226
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 ...
- 133k
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 ...
- 133k
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 ...
- 6,119
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 ...
- 5,772
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-...
- 66.7k
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)
...
- 147k
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
- 13.5k
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 ...
- 22.6k
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 ...
- 22.4k
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 ...
- 2,406
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 ...
- 2,266
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-...
- 7,107
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 ...
- 1,328
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? ...
- 3,192
3
votes
Accepted
Upsert in junction records without duplicate creation
One possible way is to have an external ID on the junction object which would be a concatenation of Account and Publisher ids.
Upserting Records
To determine whether a record already exists, the ...
- 4,917
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 ...
- 90.1k
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:
...
- 2,584
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 ...
- 9,469
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 ...
- 22.6k
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 ...
- 147k
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 ...
- 10.4k
2
votes
Accepted
Need help in fetching the details using junction object
Since Obj2 is the many-to-many relationship, query from there first:
SELECT Obj1.Name, Name, Obj3.Name, Obj.Rate__c FROM Obj2
In your pageBlockTable, you can output values via relationships:
<...
- 461k
2
votes
I cannot create child object to junction object
As per the help article:
Custom junction objects can't have detail objects. That is, a custom junction object can't become the master object in a multilevel master-detail relationship.
I strongly ...
- 344
2
votes
Accepted
Junction Object between same SObject Type (b-directional siblings)
One of the best options is to create a trigger that runs after insert update and clones each junction except reverses the lookups.
This provides the following benefits but costs data storage,etc:
...
- 625
2
votes
Hide a Field in junction object
You need to build a "page layout" for each of the RecordTypes and then hide that field from the desired page.
RecordTypes can be assign to pages and there is where you can make the changes for your ...
- 3,889
2
votes
Accepted
Can you create a 3 way many to many relationship between objects?
The N-way junction object isn't something that Salesforce supports out of the box, but it can be done with a little work and a few compromises.
The big thing here is that Salesforce only allows 2 ...
- 54.6k
2
votes
Accepted
How to avoid duplicate look up combination in many to many relationship?
You can write a before trigger on the junction object and check if the combination already exists. If yes then use addError to throw an error.
- 7,736
Only top scored, non community-wiki answers of a minimum length are eligible