Categories
Arduino Ask Engineering

nRF24L01+ problem with receiving response

I’m sending currently data from Raspberry to arduino, but I have problem with receiving response from Arduino back to Raspberry: Sent the message: [‘H’, ‘i’, ‘.’, ‘.’, ‘A’, ‘r’, ‘d’, ‘u’, ‘i’, ‘n’, ‘o’, ‘ ‘, ‘U’, ‘N’, ‘O’, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, […]

Categories
Mastering Development

How to delete a node from the Hashmap C

I have an HashMap (struct table). It contains nodes doubly linked with two parameters: key, value. Hashmap may contains every data type. Insertion of nodes is generic, so the user must choose what data type insert in the hashmap. My aim is to create a generic function in order to delete a node with a […]

Categories
CMS Mastering Development Wordpress

Woocommerce Get Orders By Meta Value

I have orders, some of them has meta value is set 0. Please see my attachment To filter out orders based on meta value, i am using below code… add_action( ‘pre_get_posts’, function( $query ) { global $pagenow; $meta_query = $query->get(‘meta_query’) ? $query->get(‘meta_query’) : array(); if ( $query->is_admin && $pagenow == ‘edit.php’ && $_GET[‘post_type’] == ‘shop_order’ […]

Categories
CMS Mastering Development Wordpress

How to prevent multiple post with same meta value being created simultaneously in WordPress (with ajax)

I’m trying to make my own appointment system for WordPress. For this, I created a post type called "appointments". When users select a service from the service list, the available dates and times are listed. When the available date and time are selected and the appointment is created, a meta key named "appointment_datetime" is added […]

Categories
CMS Mastering Development Wordpress

How to prevent multiple post with same meta value being created simultaneously in WordPress (with ajax)

I’m trying to make my own appointment system for WordPress. For this, I created a post type called "appointments". When users select a service from the service list, the available dates and times are listed. When the available date and time are selected and the appointment is created, a meta key named "appointment_datetime" is added […]

Categories
CMS Mastering Development Wordpress

How to prevent multiple post with same meta value being created simultaneously in WordPress (with ajax)

I’m trying to make my own appointment system for WordPress. For this, I created a post type called "appointments". When users select a service from the service list, the available dates and times are listed. When the available date and time are selected and the appointment is created, a meta key named "appointment_datetime" is added […]

Categories
CMS Mastering Development Wordpress

WordPress WP_Query make mysql time out

I got a problem that I install XAMPP on my computer to develop,and recently I want to use WordPress to expand two functions: 1.posts pinned and deadline is required (the post will not pinned when time is up) 2.posts remove from the list and deadline is requured too (the post will be removed from the […]

Categories
CMS Mastering Development Wordpress

How can I get posts by 2 meta keys, prioritising one of them?

Background: On my site, each product’s post has two sets of the same features. One is set by a program that imports products, the other is set by admin. The features can be price, weight, brand, a media file ID, etc. (either number or string). This makes sure the program just can’t overwrite data inserted […]

Categories
CMS Mastering Development Wordpress

WP_Query for a taxonomy value OR a custom post type meta field

I have a custom post type ‘csl_playlist_manager’, and one of its meta-fields is ‘available_to_all’. I also have a custom hierarchical taxonomy, ‘csl_source’, which identifies the owner of each playlist. I need a query that allows me to find all suitable playlists for a particular source, where "suitable" means the playlist is either available_to_all OR a […]

Categories
Mastering Development

Wrapping a React Route rendered component in a HOC not working

I wrapped the Profile component in a HOC that is supposed to redirect the user to certain page once he logs out while in this route, like so : <Route path="/profile/:username" render={props=> withAuth(<Profile currentUser={currentUser} {…props} />)} /> I get this Error: Error: Objects are not valid as a React child (found: object with keys {$$typeof, […]