Create related entities in one operation using webapi’s (Deep Insert)

https://msdn.microsoft.com/en-us/library/gg328090.aspx

The following request body posted to the Account entity set will create a total of four new entities in the context of creating an account.

·         A contact is created because it is defined as an object property of the single-valued navigation property primarycontactid.

·         An opportunity is created because it is defined as an object within an array that is set to the value of a collection-valued navigation property opportunity_customer_accounts.

·         A task is created because it is defined an object within an array that is set to the value of a collection-valued navigation property Opportunity_Tasks.

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// Request

POST [Organization URI]/api/data/v8.2/accounts HTTP/1.1

Content-Type: application/json; charset=utf-8

OData-MaxVersion: 4.0

OData-Version: 4.0

Accept: application/json

{

 "name": "Sample Account",

 "primarycontactid":

 {

     "firstname": "John",

     "lastname": "Smith"

 },

 "opportunity_customer_accounts":

 [

  {

      "name": "Opportunity associated to Sample Account",

      "Opportunity_Tasks":

      [

       { "subject": "Task associated to opportunity" }

      ]

  }

 ]

}

// Response

HTTP/1.1 204 No Content

OData-Version: 4.0

OData-EntityId: [Organization URI]/api/data/v8.2/accounts(newGuid)

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function deepInsert() {

    var entityName = "accounts";

    var clientURL = Xrm.Page.context.getClientUrl();

    var req = new XMLHttpRequest();

    req.open("POST", encodeURI(clientURL + "/api/data/v8.2/" + entityName, true));

    req.setRequestHeader("Accept", "application/json");

    req.setRequestHeader("Content-Type", "application/json; charset=utf-8");

    req.setRequestHeader("OData-MaxVersion", "4.0");

    req.setRequestHeader("OData-Version", "4.0");

    req.onreadystatechange = function () {

        if (this.readyState == 4 /* complete */) {

            req.onreadystatechange = null;

            if (this.status == 204) {

                alert("Records created");

            }

            else {

                var error = JSON.parse(this.response).error;

                alert(error.message);

            }

        }

    };

    req.send(JSON.stringify(

        {

            name: "Sample Account",

            primarycontactid:

            {

                firstname: "John",

                lastname: "Smith"

            },

            opportunity_customer_accounts:

            [

             {

                 name: "Opportunity associated to Sample Account",

                 Opportunity_Tasks:

                 [

                  { subject: "Task associated to opportunity" }

                 ]

             }

            ]

        }));

}