acf-json-for-field-group-test.json

[
    {
        "key": "group_575eae2ac9b8a",
        "title": "TC",
        "fields": [
            {
                "key": "field_575eae3ae007c",
                "label": "text",
                "name": "tc_text",
                "type": "text",
                "instructions": "",
                "required": 1,
                "conditional_logic": 0,
                "wrapper": {
                    "width": "",
                    "class": "",
                    "id": ""
                },
                "default_value": "",
                "placeholder": "",
                "prepend": "",
                "append": "",
                "maxlength": "",
                "readonly": 0,
                "disabled": 0
            },
            {
                "key": "field_575eae4ee007d",
                "label": "select",
                "name": "tc_select",
                "type": "select",
                "instructions": "",
                "required": 1,
                "conditional_logic": 0,
                "wrapper": {
                    "width": "",
                    "class": "",
                    "id": ""
                },
                "choices": {
                    "Apple": "Apple",
                    "Banana": "Banana",
                    "Fig": "Fig",
                    "Grapefruit": "Grapefruit",
                    "Orange": "Orange"
                },
                "default_value": [
                    
                ],
                "allow_null": 0,
                "multiple": 0,
                "ui": 0,
                "ajax": 0,
                "placeholder": "",
                "disabled": 0,
                "readonly": 0
            }
        ],
        "location": [
            [
                {
                    "param": "post_type",
                    "operator": "==",
                    "value": "post"
                }
            ]
        ],
        "menu_order": 0,
        "position": "normal",
        "style": "default",
        "label_placement": "top",
        "instruction_placement": "label",
        "hide_on_screen": "",
        "active": 0,
        "description": "",
        "is_acf_component": 1
    },
    {
        "key": "group_575eae805afaf",
        "title": "TestFieldGroup",
        "fields": [
            {
                "key": "field_575eaec66ee25",
                "label": "Regular",
                "name": "regular",
                "type": "tab",
                "instructions": "",
                "required": 0,
                "conditional_logic": 0,
                "wrapper": {
                    "width": "",
                    "class": "",
                    "id": ""
                },
                "placement": "top",
                "endpoint": 0
            },
            {
                "key": "field_575eaf186ee28",
                "label": "Field Group Text",
                "name": "fg_text",
                "type": "text",
                "instructions": "",
                "required": 1,
                "conditional_logic": 0,
                "wrapper": {
                    "width": "",
                    "class": "",
                    "id": ""
                },
                "default_value": "",
                "placeholder": "",
                "prepend": "",
                "append": "",
                "maxlength": "",
                "readonly": 0,
                "disabled": 0
            },
            {
                "key": "field_575eaf336ee29",
                "label": "field Group Select",
                "name": "fg_select",
                "type": "select",
                "instructions": "",
                "required": 1,
                "conditional_logic": 0,
                "wrapper": {
                    "width": "",
                    "class": "",
                    "id": ""
                },
                "choices": {
                    "Apple": "Apple",
                    "Banana": "Banana",
                    "Date": "Date",
                    "Fig": "Fig",
                    "Grapefruit": "Grapefruit",
                    "Orange": "Orange"
                },
                "default_value": [
                    
                ],
                "allow_null": 0,
                "multiple": 0,
                "ui": 0,
                "ajax": 0,
                "placeholder": "",
                "disabled": 0,
                "readonly": 0
            },
            {
                "key": "field_575eaedc6ee26",
                "label": "Component",
                "name": "_copy",
                "type": "tab",
                "instructions": "",
                "required": 0,
                "conditional_logic": 0,
                "wrapper": {
                    "width": "",
                    "class": "",
                    "id": ""
                },
                "placement": "top",
                "endpoint": 0
            },
            {
                "key": "field_575eaee36ee27",
                "label": "Example Component",
                "name": "example",
                "type": "component_field",
                "instructions": "",
                "required": 1,
                "conditional_logic": 0,
                "wrapper": {
                    "width": "",
                    "class": "",
                    "id": ""
                },
                "field_group_id": "group_575eae2ac9b8a",
                "min": 1,
                "max": 1,
                "layout": "block",
                "button_label": "Add Row",
                "appearances": "",
                "collapsed": "",
                "sub_fields": [
                    
                ]
            }
        ],
        "location": [
            [
                {
                    "param": "post_type",
                    "operator": "==",
                    "value": "test"
                }
            ]
        ],
        "menu_order": 0,
        "position": "normal",
        "style": "default",
        "label_placement": "top",
        "instruction_placement": "label",
        "hide_on_screen": "",
        "active": 1,
        "description": "",
        "is_acf_component": 0
    }
]

functions.php

<?php
/* This version does not work with my environment */

//Front-End Post Meta / ACF and Revision Storage
add_filter('acf/pre_save_post', 'pre_save_post_update_revisions');
add_action('_wp_put_post_revision', '_on_wp_put_post_revision');

function pre_save_post_update_revisions($post_id)
{
// bail early if editing in admin
// ACF already handles admin revisions correctly
    if (is_admin()) {
        return $post_id;
    }
// force a post update, this will generate a revision and
// trigger the '_wp_put_post_revision' action
    wp_update_post(get_post($post_id));
// allow acf to update the parent post meta normally
    return $post_id;
}


// revision just got created
// detect all of the acf fields on the original and
// apply them to the revision
function _on_wp_put_post_revision($revision_id)
{
// bail early if editing in admin
    if (is_admin()) {
        return;
    }
// get the revision post object
    $revision = get_post($revision_id);
// get the id of the original post
    $post_id = $revision->post_parent;
// A lot of this is copied from ACF's revision class
// get all the post meta from the original post
    $custom_fields = get_post_custom($post_id);
    if (!empty($custom_fields)) {
        foreach ($custom_fields as $k => $v) {
// value is always an array
            $v = $v[0];
// bail early if $value is not is a field_key
            if (!acf_is_field_key($v)) {
                continue;
            }
// remove prefix '_' field from reference
            $field_name = substr($k, 1);
// update the field value using the POST value supplied in the form

//error_log("-------------------------- Attempted Save");
//error_log(print_r($_POST['acf'][$v], true) );

            if (!is_admin()) {
                update_field($field_name, $_POST['acf'][$v], $revision_id);
// add the reference key
                update_metadata('post', $revision_id, $k, $v);
            }
        }
    }
}

functions.php - working

<?php
add_filter('acf/pre_save_post', 'pre_save_post_update_revisions');
function pre_save_post_update_revisions($post_id)
{
// bail early if editing in admin
// ACF already handles admin revisions correctly
    if (is_admin()) {
        return $post_id;
    }
    
// force a post update, this will generate a revision and
// trigger the '_wp_put_post_revision' action
    wp_save_post_revision(get_post($post_id));
    //wp_update_post(get_post($post_id));
    
    return $post_id;
}



add_action('_wp_put_post_revision', '_on_wp_put_post_revision');
// revision just got created, detect all of the acf fields on the original and apply them to the revision
function _on_wp_put_post_revision($revision_id) {
// bail early if editing in admin
    if (is_admin())
        return;

    // get the revision post object
    $revision = get_post($revision_id);
    // get the id of the original post
    $post_id = $revision->post_parent;


    if (!empty($_POST['acf'])) {
        foreach ($_POST['acf'] as $k => $v) {

            // bail early if $value is not is a field_key
            if (!acf_is_field_key($k)) {
                continue;
            }

            update_field($k, $v, $revision_id);
            update_metadata('post', $revision_id, $k, $v);

        }
    }
}
?>