[Django] Python Django 파이썬 장고

---

pluralsight  Python Django Getting Started Lecture Note 

 

 

 

파이썬 장고를 옛날에 한번 해봤엇는데 , 다 까먹은것같다. 

지금 프로젝트를 하고있는데, 처음에 그냥 html page를 만들어서  보여주기만하기로했었는데, 교수님이  그안에 사람들의 답을 저장해서 

나중에 쓸일이있다고하시니, 백앤드까지 다 필요할것같다.

 

그중에 제일 쉽고 빠르고 편리한 장고를 골라와봤다. 

 

아마도 현재 진행하는 프로젝트는 Django 에  Heroku에 postgress 와함께 배포할예정인데, 시간안에 다할수있을지 모르겠다.

 

 

일단 그래서 필요한 장고 lecture부터 찾아보기로했다.

 

app.pluralsight.com/library/courses/django-getting-started/table-of-contents

Django: Getting Started

 

 

수업은 meeting planner를 실습으로 만들면서 이루어진다.

기본적인 djnago 수업이라  model - template - view 에 관한 

 

 

 

Django: Getting Started  by Reindert-Jan Ekker

 

Lecture1: Course Overview 

 

Lecture2:  Starting a Django Project 

 

Django : Python web frame work

 

Django: Getting Started

### 2Django: Sratrgin a Django proejct ###

Python Basic of HTML Django : Python web framework

ORM/Admin : powerful tools Template ,URL mapping, Forms , packages

python3 -m venv venv(virtual enviroment directory name) : create virtual enviroment

source venv(virtual enviroment directory name )/bin/activate

pip install django

 

django-admin startproject meeting_planner : start project and create folder "meeting_planner"

 

cd meeting_planner

python mange.py runserver

--------------------------------------------------------------------

db.sqlite3 : db data base

 

__init__.py : empty/ ?

 

settings.py: where is the proejct is define / setting for the project

 

urls.py: assignes url

 

asgi.py , wsgi.py : deployment to the production server

manage.py :

--------------------------------------------------------------------

Lecture3: Creating a simple Web page 

 

create app ?

 

go to the project folder (meeting_planner)

python manage.py startapp app_name // you can make an app

=> once you create the app you want to build , delte admin.py, apps.py, models.py, tests.py (delete the migrataion file too)

and go back to the main settings.py and add the app in the INSTALLED_APPa

first of all you have to make views.py

from django.http import HttpResponse

 

def welcome(request):

return HttpResponse("What sup this is skyler's django first page")

 

and urls.py : you need to import the views and the function and map the url

from website.views import welcome

path('welcome.html', welcome)

path('', welcome) // empty url for the main page

 

1. make view function

2. import the function in the urls.py

3. url mapping

4. setting add the app

 

in the production make sure you turn off the debug true

 

Django App : Python packages

1 web may consisted with mulitple apps

 

Lecture4: Setting up d Data Model

 

Django model classes

 

2core concepts : 1. models (python clases) mapped to database table

2. Migrations (python scripts) keep db structure in sync with code

Migration

 

python manage.py showmigrations ## show the migration needed

python manage.py migrate ## migrate the thing and if you go to db.squlite3 its automaticlly updtated

GO to model

and write the class

class Meeting(models.Model):

title = models.CharField(max_length=200)

date = models.DateField()

after this you can

python manage.py makemigrations ## to genearate meetings/migrations/0001_initial.py file

python manage.py migrate

you can also change around in the admin page

you need to go to admin.py

 

and improt what you need to do .

 

from .models import Meeting

admin.site.register(Meeting)

## to make the super user in admin

python.magage.py createsuperuser email/pwd

Django Models ; saving python objects in a database

Models classesare mapped to tables

fields are mapped to clumns

SQL is generated -

for more django model fields - google

what if you want to add "ROOM " in the model ?

you add the Class Room in the model

 

To make things easy , you delete all the migratoin file + db.sqlite3 for the clean start

but this makes you have to create the super user ide again

*this is not good idea for the exisiting proejct that has lots data only recommend for the starting the new project

 

so after delete you have to migrations

python manage.py makemigrations

python manage.py migrate

 

 

Lecture5: Combining Model, View, and Template

 

1)

 

Model , Template , View

 

Template - creating webpate / generate HTML

from django.shortcuts import render ##from vidw.py we have to import render

 

dedef welcome(request):

return render(request, "website/welcome.html") ## return the html page!

now you cna render the html page via rendr from view.py

2) taking parameters from the URL

 

you need to build the view.py of that certain app with parameter in URL

 

in this case meetings -> tempalte -> meetings -> details.html

 

from django.shortcuts import render, get_object_or_404

from .models import Meeting

 

and the view.py of the meeting will be like this

def detail(request, id):

meeting = get_object_or_404(Meeting, pk=id)

return render(request, "meetings/details.html", {"meeting": meeting})

 

URL mapping with parameter :

path('meetings/<int:id>', detail),

 

 

 

Lecture6: Urls and Link Building

 

 

### 6 Urls and Link Building ####

 

Link building : Named URL && for loop in template

 

this let print all the meeting from the database by loop

<ul>

{% for meeting in meetings%}

<li>

<a href="{% url 'detail' meeting.id %}">

<a href="/meetings/{{meeting.id}}"> this is old way

{{meeting.title}}

</a>

</li>

{% endfor%}

</ul>

path('meetings/<int:id>', detail, name="detail") ## this let the naming the URL

3 steps :

-view

-template

-url mapping

 

make sure you do step by step + you should know what you are doing. (very important)

1. if you want to list all the room in the welcome => add return value in the views.py from home app

2. change view.py in the meeting app

3. change template of both welcome & room deatil .html

4. url mapping

URL mapping

 

 

Lecture7: Templates, Styling and Static Contents

 

CSS stylesheet

 

make static > website # in the folder in the appropriate postiion

and in the html page put this instead of hard coding the href

{% load static %}

<link rel="stylesheet" href="{% static 'website/style.css' %}" />

 

img :

<img src= "{% static 'website/1.png' %}" width = "400px">

 

tempalte inheritance

base.html in right under templates folder

 

 

Lecture8: Adding User interaction with ModelFroms 

 

 

Add ModelForm

Form template

ModelForm

View

in the views.py :

 

from django.shortcuts import redirect

def new(request):

if request.method == "POST":

form = MeetingForm(request.POST)

if form.is_valid():

form.save()

return redirect("home")

 

else:

form = MeetingForm()

return render(request, "meetings/new.html", {"form": form})

urls:

 

path('new', views.new, name="new"),

template:

{% extends "base.html" %} {% block sweetpotato %} {% block potato %} New Meeting

Form {%endblock%}

 

<h1>Plan a new meeting</h1>

<form method="post">

<table>

{{form}}

</table>

{% csrf_token%}

<button type="submit">Create</button>

</form>

 

{% endblock%}

 

마무리 : 

 

이번 강의를 통해서 기본적인 장고 실습을 할수있엇다.  강의내에서 실습예제로 미팅 플래너를 만들었는데, 새 미팅 추가 및 삭제 그리고 미팅룸 설정 까지 할수있는 기본적인 웹사이트를 만들었다.  강의만 따라해도 정말 쉽게 장고에대해서 기본적인 세팅 방법등을 알수있어서 좋은 강의인것같다. 특히 Jane-Ekker강사님의 강의 방식이 정말 쉽고 이해가 잘되게 설명을 해줘서 좋은 강의인것같다. 장고를 처음 공부하는 나한테 딱 맞는 강의였다. 

---