Tutorial by Examples: g

Deleting documents from a collection in mongoose is done in the following manner. Auto.remove({_id:123}, function(err, result){ if (err) return console.error(err); console.log(result); // this will specify the mongo default delete result. });

You can use plugman command to install/uninstall custom cordova plugins. To install plugman npm install -g plugman Install plugin command syntax: plugman <install|uninstall> --platform <ios|android|blackberry10|wp8> --project <directory> --plugin <name|url|path> Exa...

To call a list of goals as if it were a conjunction of goals, combine the higher-order predicates call/1 and maplist/2: ?- Gs = [X = a, Y = b], maplist(call, Gs). Gs = [a=a, b=b], X = a, Y = b.

systemd provides a modern implementation of cron. To execute a script periodical a service and a timer file ist needed. The service and timer files should be placed in /etc/systemd/{system,user}. The service file: [Unit] Description=my script or programm does the very best and this is the descri...

Below is an example of Gstreamer pipeline embedded in a simple gtk window. When run, a small window should appear like this: import gi gi.require_version('Gtk', '3.0') gi.require_version('Gst', '1.0') from gi.repository import Gtk, Gst Gst.init(None) Gst.init_check(None) class GstWidg...

Below is a configuration file for log4j. Log4j2 can use the same syntax, but there are different appender classes: log4j.rootLogger=INFO, FOO ## ConsoleAppender log4j.appender.CA=org.apache.log4j.ConsoleAppender log4j.appender.CA.layout=org.apache.log4j.PatternLayout log4j.appender.CA.layout....

XML Example The below configuration configures two appenders (log output). The first logs to standard system output (console) and the other logs to file. In this example, the location of the file can be set statically in configuration (appender file) or dynamically via maven filtering feature (<...

FFmpeg (or "Fast Forward MPEG") is a simple yet feature rich command line utility to allow the manipulation (including decoding, encoding, transcoding, muxing, demuxing, streaming, filtering, and playing) of media and video files. This utility differs from other GUI orientated software as ...

Conditions: package should be at least installed. If not loaded in the current session, not a problem. ## Checking package version which was installed at past or ## installed currently but not loaded in the current session packageVersion("seqinr") # [1] ‘3.3.3’ packageVer...

To check the list of loaded packages search() OR (.packages())

A frequent reason why your read operation may not work is because your security rules reject the operation, for example because you're not authenticated (by default a database can only be accessed by an authenticated user). You can see these security rule violations in the Console output. But it's ...

Model With EF Core, data access is performed using a model. A model is made up of entity classes and a derived context that represents a session with the database, allowing you to query and save data. You can generate a model from an existing database, hand code a model to match your database, or ...

<?php echo get_field('my_field_name', 123); ?> This will echo the value of "my_field_name" from the post with 123 as its ID.

<?php echo get_field('my_field_name', 'option'); ?> This will echo the value of "my_field_name" from the options page created via ACF.

First of all we need to add MEDIA_ROOT and MEDIA_URL to our settings.py file MEDIA_ROOT = os.path.join(BASE_DIR, 'media') MEDIA_URL = '/media/' Also here you will work with ImageField, so remember in such cases install Pillow library (pip install pillow). Otherwise, you will have such error: I...

The setCustomTitle() method of AlertDialog.Builder lets you specify an arbitrary view to be used for the dialog title. One common use for this method is to build an alert dialog that has a long title. AlertDialog.Builder builder = new AlertDialog.Builder(context, Theme_Material_Light_Dialog); buil...

WKWebView resizes the fonts on web content so that a full-sized web page will fit on the device's form factor. If you want the web text in both portrait and landscape to be similar in size to the user's preferred reading size, you need to set it explicitly. Swift // build HTML header for dynamic t...

There are two kinds of programs the kernel knows of. A binary program is identified by it's ELF (ExtenableLoadableFormat) header, which is usually produced by a compiler. The second one are scripts of any kind. If a file starts in the very first line with the sequence #! then the next string has to...

Dim cars Dim filefullname : filefullname = "C:\testenv\test.txt" 'If you can, create an instaneous read for text file data for better memory handling. 'Unless it's a large file and that's impossible. cars = Split(CreateObject("Scripting.FileSystemObject").OpenTextFile(filefu...

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); class Cron extends CI_Controller { /** * This is default constructor of the class */ public function __construct() { parent::__construct(); $this->load->library('input'...