Entity reference field in REST I'm trying to create content with REST, everything worked correctly until we need to an entity Reference field,I add it to my content type and in want to pass entity referenced nid to it with 

Part of my code : 

    formValues.gender = parseInt($('input[name=optradio]:checked').val());
    var postData = {};
    postData.title = [{'value': formValues.name }];
    postData.field_enroll_email = [{'value': formValues.email}];
    postData.field_gender = [{'value': formValues.gender }];
    postData.field_phone_number = [{'value': formValues.phone }];
    postData.field_course_ref = [{'value': formValues.nid }];
    if(formValues.ac != "") {
        postData.field_academic_certificate = [{'value': formValues.ac }];
    }
    if(formValues.ec != "") {
        postData.field_english_certificate = [{'value': formValues.ec }];
    }
    postData.type = 'enroll';
    jQuery.ajax({
        url: "/entity/node",
        method: "POST",


my entity referenced machine name field is field_course_ref and I tried following method (formValues.nid contain nid of Node that I want to referenced it )

    postData.field_course_ref = [{'value': formValues.nid }];


How can I fill entity referece field with REST ?
After some research (How to POST an "entity reference" field to a node ? , REST views entity reference  issue

I found the solution, we should pass nid as target_id, final asnwer is 

postData.field_course_ref = [{'target_id': formValues.nid }];


it's work correctly, I answer my question maybe be helpful for another guy later.