Fredy  Larson

Fredy Larson

1618819001

Gatsby Page Queries with Environment Variables

Learn GatsbyJS Page Queries with environment variables while implementing a Markdown Publishing Workflow

The core issue we’ll cover is using environment variables with page queries for pages in the src\pages folder. This is apparently a common problem (example). I definitely struggled with it before I got it working. We’ll also cover page queries, variables, and the createPage action.

The Markdown Publishing Workflow:

My blog uses the Gatsby Starter Blog, which loads blog articles from Markdown (MD) files. It lists and loads ALL the blog articles whether you are done writing them or not.

I want a standard publishing workflow: articles will be shown on the web site based on their “status”. Status can be “draft”, “published” or “archived”.

I want “published” and “draft” articles to be published when I’m in “gatsby develop” mode. I can then see what draft articles will look like as I edit/save them.

When I run gatsby build; gatsby serve, I want to only show articles that have status = “published”. That is best accomplished using _environment variables (env vars). _Env vars are most useful when you want to store information that changes (aka a variable) based on which mode (dev vs prod) or which location (China vs USA) you are publishing into.

#react #graphql #web-development #netlify #gatsbyjs

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Gatsby Page Queries with Environment Variables
Ahebwe  Oscar

Ahebwe Oscar

1620185280

How model queries work in Django

How model queries work in Django

Welcome to my blog, hey everyone in this article we are going to be working with queries in Django so for any web app that you build your going to want to write a query so you can retrieve information from your database so in this article I’ll be showing you all the different ways that you can write queries and it should cover about 90% of the cases that you’ll have when you’re writing your code the other 10% depend on your specific use case you may have to get more complicated but for the most part what I cover in this article should be able to help you so let’s start with the model that I have I’ve already created it.

**Read More : **How to make Chatbot in Python.

Read More : Django Admin Full Customization step by step

let’s just get into this diagram that I made so in here:

django queries aboutDescribe each parameter in Django querset

we’re making a simple query for the myModel table so we want to pull out all the information in the database so we have this variable which is gonna hold a return value and we have our myModel models so this is simply the myModel model name so whatever you named your model just make sure you specify that and we’re gonna access the objects attribute once we get that object’s attribute we can simply use the all method and this will return all the information in the database so we’re gonna start with all and then we will go into getting single items filtering that data and go to our command prompt.

Here and we’ll actually start making our queries from here to do this let’s just go ahead and run** Python manage.py shell** and I am in my project file so make sure you’re in there when you start and what this does is it gives us an interactive shell to actually start working with our data so this is a lot like the Python shell but because we did manage.py it allows us to do things a Django way and actually query our database now open up the command prompt and let’s go ahead and start making our first queries.

#django #django model queries #django orm #django queries #django query #model django query #model query #query with django

Sadie  Cassin

Sadie Cassin

1598812920

Set the Path for Python in Windows | Liquid Web Knowledge Base

Python is a powerful programming language that is scalable and uses code that is readable and clear for all types of projects. Python is also available across a number of operating systems, making it a popular choice for developers. If you are using Python on your Windows operating system, you may need to adjust your System Environment Variables to simplify utilizing Python on your server.

Method 1

The latest Python installer for Windows can set the System Environment Variable Path automatically if selected during the installation process.

Method 2

This method involves modifying the path of an existing Python installation. To verify if the path setting is correct or current, follow these steps.

Step 1.

Open an administrative command prompt by going to

Start > Windows System > Command Prompt.

Next, right-click on the command prompt icon, choose More, then choose “run as administrator“.

command

Step 2.

Once the Type in the python command, and then press Enter. If the System Variable Path is correctly set, you should receive output similar to what is shown below.

command2

When using Powershell, the output will look like this.

command3If an error is seen indicating that the Python command is unknown, but we have confirmed that Python is installed and can be launched from within its directory, we will need to add the Python path to the System Environment Variables.

#tutorials #environment #environment variables #iis #powershell #python #python 3 #system variables #user variables #windows

Joseph  Murray

Joseph Murray

1623967440

Reference Variable in Java

Before We Started with the Reference variable we should know about the following facts.

**1. **When we create an object(instance) of class then space is reserved in heap memory. Let’s understand with the help of an example.

Demo D1 = new Demo();

Reference Variable

Now, The space in the heap Memory is created but the question is how to access that space?.

Then, We create a Pointing element or simply called Reference variable which simply points out the Object(the created space in a Heap Memory).

Heap Memory

**Understanding Reference variable **

1. Reference variable is used to point object/values.

**2. **Classes, interfaces, arrays, enumerations, and, annotations are reference types in Java. Reference variables hold the objects/values of reference types in Java.

3. Reference variable can also store null value. By default, if no object is passed to a reference variable then it will store a null value.

**4. **You can access object members using a reference variable using **dot **syntax.

.<instance variable_name / method_name>

#java #reference variable in java #variables in java #reference variables #refer #variable's

Ray  Patel

Ray Patel

1623384600

Scope of a Variable In Java [With Coding Example]

Introduction

Programmers define the scope of a Variable in Java that tells the compiler about the region from where a variable is accessible or visible. The scope of a variable in Java is static by nature. It means we have to declare it at compile time only. In this article, you will learn about the scope of a Java variable along with its types

What is the Scope of a Variable in Java?

Salient Points About the Scope of a Variable in Java

Conclusion

#full stack development #java variable #scope of a variable in java #variable #scope of a variable #scope

Erna  Herzog

Erna Herzog

1626652620

Gatsby JS: Create a 404 Not Found Page

Build a 404 not found page for Gatsby when users landing on routes that don’t exist in your application.

This is a single video in a series of 26 lessons. Watch the entire course at this playlist here: https://www.youtube.com/playlist?list=PLW0RabRDhwwzVNhlOgQQgw6HJzXdM1MnT

Want to support the channel? We make our courses free to watch so anyone can access our content and level up their skills. For our larger courses, like this one, we sell the final code and design files for a small price to help support the creation of free educational content like this.

You can purchase the course files below–any support is greatly appreciated!

#WebDev #WebDesign #WebDevelopment

#gatsby js #webdev #gatsby #js #a 404 not found page