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Create and associate with an existing record many-to-many relationship entity data through the web api?

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I can't for the life of me figure out or find any documentation for how to create an record and associate it with another record in a many-to-many relationship through the web api.

Similar as the example in https://docs.microsoft.com/en-us/powerapps/developer/common-data-service/webapi/create-entity-web-api#bkmk_CreateRelated under "Associate entity records on create" but with a many-to-many.

Let's say I have a entity called Class with a N:N to Student. If I wanted to create a new class with association to a couple of already existing students I assume I would do something like this:

POST: xxx.crm11.dynamics.com/.../classes

{

"students" : [{

"student@odata.bind" : "/students(00000000-0000-0000-0000-0000000001)",

"student@odata.bind" : "/students(00000000-0000-0000-0000-0000000002)"

}]

}

Would this be correct? Or am I misunderstanding something?

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Rui Carvalho on at

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Hello Stenu,

I know that you are trying to associate a Class to students when creating the class.
But when doing this association, and looking into the documentation, it refers to a collection or to a field that comes from the relationship.
Now on a N:N relationship you don't have a field, I'm assuming you have a grid on the form by going to the related correct?

Before I jump into the Associate when create the record I would start with Associate only:
https://docs.microsoft.com/en-us/powerapps/developer/common-data-service/webapi/associate-disassociate-entities-using-web-api#add-a-reference-to-a-collection-valued-navigation-property

The example is for 1:N but you can see that it also refers it should work on N:N
'This is a 1:N relationship but you can perform the same operation for an N:N relationship.'

Verify if by associating a Class that already exists with students that already exists works, and then adjust to Create and Associate.

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Matthieu.Delattre 25 on at

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Hello,

In order to find the API to relate and unrelate records in Dynamics, you could use Power Automate and the appropriate CDS nodes and then investigate the code behind the node:

- Relate records

- Unrelate records

Matthieu DELATTRE

CRM Consultant

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Community Member on at

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Hey,

Good idea. I managed to associate a class and students that already exists following the link you sent, but I still struggle with Create and Associate. When I run this it actually works and I get the 204, but it does not associate with the existing student but creates a new, empty student (with a different ID than I sent, obviously)

POST to uri/api/data/v9.1/cr82e_consolidationresults?

{

"new_class" : "ClassName",

"new_class_new_student" :

[

{

"@odata.id" : "/new_student(xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxx)"

}

]

}

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