【发布时间】：2019-09-14 13:17:18
【问题描述】：
在 WordPress 中，如果购物车中已经存在记录，我想将数量更新 +1（在代码中查询）。
三列在表中是唯一的。更新 qty 列时，此代码中出现重复输入错误。但是，如果我使用来自控制台的直接查询，它会更新 qty 值而不会出错。
我也在 AjAX 中调用了这个方法。那是返回未定义的（可能在 ajax 错误中）。
那么我怎样才能让这段代码与 Ajax 一起工作，如果没有记录而不是插入 else 只需将 qty 值更新为 +1
$this->gs_db是数据库类实例，$this->gs_db->db是$wpdb
表格
CREATE TABLE IF NOT EXISTS wp_gs_pg_cart (
id BIGINT(20) AUTO_INCREMENT UNIQUE NOT NULL,
product_group BIGINT(20) NOT NULL,
qty INT(11) NOT NULL,
group_id BIGINT(20) NOT NULL,
group_admin BIGINT(20) NOT NULL,
group_user BIGINT(20) NOT NULL,
added_at DATETIME DEFAULT NOW() NOT NULL,
PRIMARY KEY (id),
INDEX pg_cart_index (ID, product_group, group_id, group_admin, group_user),
UNIQUE pg_cart_unique (product_group, group_id, group_user)
);
类方法
/**
* Add product group into the cart
*
* @param int $group_id group id
* @param int $product_group product group id
* @param int|bool $group_user group user / logged in id
*
* @return int inserted row id if new else update row id
*/
public function add_pg_to_cart($group_id, $product_group, $group_user = FALSE)
{
$this->group_id = $group_id;
$this->qty = 1;
$this->product_group = $product_group;
$this->group_admin = $this->group_id;
$this->group_user = ($group_user) ? absint($group_user) : absint(get_current_user_id());
// check if record is already exists
$query = "SELECT * FROM wp_gs_pg_cart WHERE product_group = '%d' AND group_id = '%d' AND group_user = '%d'";
$prepare = $this->gs_db->db->prepare($query, $this->product_group, $this->group_id, $this->group_user);
$result = $this->gs_db->db->get_row($prepare);
if ($this->gs_db->db->num_rows > 0) {
$this->qty += $result->qty;
$this->gs_db->db->update($this->gs_db->get_pg_cart_table(), ['qty' => $this->qty], ['id' => $result->id], '%d');
$this->id = $result->id;
} else {
// setup data to insert
$this->data = [
'product_group' => $this->product_group,
'qty' => $this->qty,
'group_id' => $this->group_id,
'group_admin' => $this->group_admin,
'group_user' => $this->group_user,
];
// setup data format
$this->format = [
'%d',
'%d',
'%d',
'%d',
'%d',
];
// insert record
$this->gs_db->db->insert($this->gs_db->get_pg_cart_table(), $this->data, $this->format);
// get the id for inserted record
$this->id = $this->gs_db->db->insert_id;
}
return $this->id;
}
Ajax 回调函数
function gs_pg_add_to_cart_ajax()
{
// Check if user is logged in
if ( ! is_user_logged_in()) {
// throw error if user is not logged in
wp_send_json_error(__('Please login to order', 'group-shop'));
// we use this manually as want to print error
wp_die();
}
// check and validate nonce
if ( ! check_ajax_referer('gs_nonce', 'nonce', FALSE)) {
// throw error if validation fails
wp_send_json_error(__('Do not be nasty with validation', 'group-shop'));
}
$group_id = 0;
$product_group = 0;
$cart_id = 0;
// validate product_group
if ( ! isset($_POST[ 'product_group' ]) || empty($_POST[ 'product_group' ]) || $_POST[ 'product_group' ] <= 0) {
// throw error if validation fails
wp_send_json_error(__('Product Group is not defined', 'group-shop'));
} else {
$product_group = absint($_POST[ 'product_group' ]);
}
// validate product_group
if ( ! isset($_POST[ 'group_id' ]) || empty($_POST[ 'group_id' ]) || $_POST[ 'group_id' ] <= 0) {
// throw error if validation fails
wp_send_json_error(__('Group is not defined', 'group-shop'));
} else {
$group_id = absint($_POST[ 'group_id' ]);
}
// initialize cart object
$cart = new Group_Shop_Cart();
// insert record
$cart_id = $cart->add_pg_to_cart($group_id, $product_group);
// if record inserted
if ($cart_id > 0) {
// show success message once record inserted
wp_send_json_success(__('Product is added to cart', 'group-shop'));
} else {
// throw error if fails to insert record
wp_send_json_error(__('Something went wrong', 'group-shop'));
}
// stop further execution once all process done
wp_die();
}
Javascript
(function ($) {
$(function () {
let response_alert = $('#response');
response_alert.hide();
$('form.gsGpAddToCart').on('submit', function (e) {
e.preventDefault();
let formData = $(this).serialize();
$.ajax({
method: 'POST',
dataType: 'json',
url: ajax_vars.ajax_url,
data: formData + "&action=gs_pg_add_to_cart&nonce=" + ajax_vars.nonce,
success: function (response) {
console.log(response);
let response_alert = $('#response');
if (response.success === true) {
response_alert.fadeIn().prepend(alerts('success', response.data));
}
if (response.success === false) {
response_alert.fadeIn().prepend(alerts('error', response.data));
}
},
error: function (response) {
let error_message = (response.data === undefined) ? 'Something went wrong!' : response.data;
response_alert.fadeIn().prepend(alerts('error', error_message));
gs_alert_stats();
},
complete: function () {
}
});
return false;
});
// control dynamically created error with JS - close/hide
function gs_alert_stats() {
let gs_alert = $('.gs-message');
$('.gs-close').on('click', function () {
alerts('Clicked');
$(this).parent(gs_alert).fadeOut();
});
}
});
})(jQuery);
Javascript 正在返回此错误响应 Something went wrong!，它位于 error: function (response)
【问题讨论】：