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September 21, 2020 19:00
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| <?php | |
| add_filter('acf/update_value/key=field_5a67cc16e1169', 'acf_reciprocal_relationship', 10, 3); //edit this with your ID - field one | |
| add_filter('acf/update_value/key=field_5b7d60a26c7b5', 'acf_reciprocal_relationship', 10, 3); //edit this with your ID - field two | |
| function acf_reciprocal_relationship($value, $post_id, $field) { | |
| // set the two fields that you want to create | |
| // a two way relationship for | |
| // these values can be the same field key | |
| // if you are using a single relationship field | |
| // on a single post type | |
| // the field key of one side of the relationship | |
| $key_a = 'field_5a67cc16e1169'; //edit this with your ID - field one | |
| // the field key of the other side of the relationship | |
| // as noted above, this can be the same as $key_a | |
| $key_b = 'field_5b7d60a26c7b5'; //edit this with your ID - field two | |
| // figure out wich side we're doing and set up variables | |
| // if the keys are the same above then this won't matter | |
| // $key_a represents the field for the current posts | |
| // and $key_b represents the field on related posts | |
| if ($key_a != $field['key']) { | |
| // this is side b, swap the value | |
| $temp = $key_a; | |
| $key_a = $key_b; | |
| $key_b = $temp; | |
| } | |
| // get both fields | |
| // this gets them by using an acf function | |
| // that can gets field objects based on field keys | |
| // we may be getting the same field, but we don't care | |
| $field_a = acf_get_field($key_a); | |
| $field_b = acf_get_field($key_b); | |
| // set the field names to check | |
| // for each post | |
| $name_a = $field_a['name']; | |
| $name_b = $field_b['name']; | |
| // get the old value from the current post | |
| // compare it to the new value to see | |
| // if anything needs to be updated | |
| // use get_post_meta() to a avoid conflicts | |
| $old_values = get_post_meta($post_id, $name_a, true); | |
| // make sure that the value is an array | |
| if (!is_array($old_values)) { | |
| if (empty($old_values)) { | |
| $old_values = array(); | |
| } else { | |
| $old_values = array($old_values); | |
| } | |
| } | |
| // set new values to $value | |
| // we don't want to mess with $value | |
| $new_values = $value; | |
| // make sure that the value is an array | |
| if (!is_array($new_values)) { | |
| if (empty($new_values)) { | |
| $new_values = array(); | |
| } else { | |
| $new_values = array($new_values); | |
| } | |
| } | |
| // get differences | |
| // array_diff returns an array of values from the first | |
| // array that are not in the second array | |
| // this gives us lists that need to be added | |
| // or removed depending on which order we give | |
| // the arrays in | |
| // this line is commented out, this line should be used when setting | |
| // up this filter on a new site. getting values and updating values | |
| // on every relationship will cause a performance issue you should | |
| // only use the second line "$add = $new_values" when adding this | |
| // filter to an existing site and then you should switch to the | |
| // first line as soon as you get everything updated | |
| // in either case if you have too many existing relationships | |
| // checking end updated every one of them will more then likely | |
| // cause your updates to time out. | |
| //$add = array_diff($new_values, $old_values); | |
| $add = $new_values; | |
| $delete = array_diff($old_values, $new_values); | |
| // reorder the arrays to prevent possible invalid index errors | |
| $add = array_values($add); | |
| $delete = array_values($delete); | |
| if (!count($add) && !count($delete)) { | |
| // there are no changes | |
| // so there's nothing to do | |
| return $value; | |
| } | |
| // do deletes first | |
| // loop through all of the posts that need to have | |
| // the recipricol relationship removed | |
| for ($i=0; $i<count($delete); $i++) { | |
| $related_values = get_post_meta($delete[$i], $name_b, true); | |
| if (!is_array($related_values)) { | |
| if (empty($related_values)) { | |
| $related_values = array(); | |
| } else { | |
| $related_values = array($related_values); | |
| } | |
| } | |
| // we use array_diff again | |
| // this will remove the value without needing to loop | |
| // through the array and find it | |
| $related_values = array_diff($related_values, array($post_id)); | |
| // insert the new value | |
| update_post_meta($delete[$i], $name_b, $related_values); | |
| // insert the acf key reference, just in case | |
| update_post_meta($delete[$i], '_'.$name_b, $key_b); | |
| } | |
| // do additions, to add $post_id | |
| for ($i=0; $i<count($add); $i++) { | |
| $related_values = get_post_meta($add[$i], $name_b, true); | |
| if (!is_array($related_values)) { | |
| if (empty($related_values)) { | |
| $related_values = array(); | |
| } else { | |
| $related_values = array($related_values); | |
| } | |
| } | |
| if (!in_array($post_id, $related_values)) { | |
| // add new relationship if it does not exist | |
| $related_values[] = $post_id; | |
| } | |
| // update value | |
| update_post_meta($add[$i], $name_b, $related_values); | |
| // insert the acf key reference, just in case | |
| update_post_meta($add[$i], '_'.$name_b, $key_b); | |
| } | |
| return $value; | |
| } // end function acf_reciprocal_relationship |
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