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HTTP -> HTTPS, NIGNX, LET’S ENCRYPT

發佈日期: 2024 年 3 月 5 日，作者: fluber

Install Certbot on Ubuntu Host

 * certificate：/etc/letsencrypt/live/your_domain.com/fullchain.pem
 * privatekey：/etc/letsencrypt/live/your_domain.com/privkey.pem

分類: 未分類 | 發佈留言


DJANGO OPTIMISTIC LOCKING (樂觀鎖定)

發佈日期: 2024 年 3 月 4 日，作者: fluber

current in process record the version will be update += 1, so when in the same
time another one do same thing will updated_rows == 0.

分類: Django | 發佈留言


DJANGO PESSIMISTIC LOCKING (悲觀鎖定)

發佈日期: 2024 年 3 月 4 日，作者: fluber

when select task by id, the database lock the record. if other one to do same
time the second one will get the “Task is already claimed or completed”

We use transaction.atomic() as a context manager to ensure that all database
operations within the block are atomic, meaning they are either all committed or
all rolled back in case of an error.



分類: Django | 發佈留言


DIGANGO VIEWS

發佈日期: 2024 年 3 月 4 日，作者: fluber
 * Understanding Django Views
   * avoid add business logic into the view, if embedding business logic
     directly into the view will make it nonreusable, not testability and
     coupling.
 * Django’s Generic Views
   * from django.views.generic import ListView, DetailView, TemplateView
   * from django.views.generic.dates import ArchiveIndexView, YearArchiveView,
     MonthArchiveView, DayArchiveView, TodayArchiveView, DateDetailView
   * from django.views.generic.edit import FormView, CreateView, DeleteView,
     UpdateView, DeleteView
   * use help(ListView) to check detail property and method and so on

 1. 

 * Mixins
   * refers to a class that provides additional functionality to other classes
     through inheritance.

 * Django Mixin
   * ContextMixin: Adds extra context data to the view
   * TemplateResponseMixin: Renders template and returns an HTTP response
   * FormMixin: Used to handle form submission and validation
   * CreateModelMixin: Used to save a new object to database
   * UpdateModelMixin: Used to upate an existing object in database
   * DeleteModelMixin: Used to delete an object
 * URL Configuration
   * ulrpatterns = [
     re_path(r’^tasks/(?P<by_date>[0-9]{4}-[0-9]{2}-[0-9]{2})/$’,
     views.query_by_date, name=”task_list”),]

^: indicating the begin

$: indicateing the last

[0-9]{4}: 4 characters and each character is 0~9.

(?P<by_date>…….), will pass the value as by_date parameter to the view.

r preceding the string is a flag, informing Python that this is a raw string

 * url path built-in convert:
   * str
   * int
   * slug
   * uuid
   * path
 * url path custom convert

 * URL Namespace and Name tasks:task-detail

to use namespace for urls, use app_name in the urls.py

 * HttpRequest object
   * request.method
   * request.user
   * request.path
   * request.GET
   * request.POST
   * request.FIELS
   * request.headers

 * HttpResponse object
   * the object accept a parameter that contains the content destined for
     client.

分類: Django | 發佈留言


USE DOCKER-COMPOSE TO HELP DJANGO DEVELOPMENT

發佈日期: 2024 年 2 月 29 日，作者: fluber

cd ~

mkdir practice_folder

#create a virtualenv

python -m venv .venv

.venv\scripts\activate.bat

pip install django~=4.0.0 psycopg2-binary~=2.9.9

django-admin startproject django_project .

python manage.py runserver 0.0.0.0:8000

pip freeze > requirements.txt

create a Dockfile

create docker-compose.yml

docker-compose up -d –build

vim django_project/settings.py

In the Windows Host Computer Modify django source code and

 * docker-compose.exe web python manage.py startapp accounts
 * docker-compose.exe web python manage.py makemigrations accounts
 * docker-compose.exe web python manage.py migrate
 * docker-compose.exe web python manage.py createsuperuser
 * …………
 * 

分類: Django | 發佈留言


USE DOCKER TO HELP DJANGO DEVELOPMENT

發佈日期: 2024 年 2 月 26 日，作者: fluber

if you have pyenv Dockerfile, you can use docker built -t django:latest . to
build a docker image.

command: docker run –rm -p 8000:8000 -p 3000:3000 -v
c:\Users\Fluber\Project\Docker\django\book_django_beginners\:/home/fluber/code
-it django:latest



enter a docker console environment to develop.

virtualenv .venv to build a python project environment.

pip install django==4.0.10

ajango-admin startproject new_project

python manage.py startapp new_app

modify new_project/settings.py and new_project/urls.py

modify new_app/models.py new_app/views.py new_app/urls.py

use python manage.py makemigrations

use python manage.py migrate

using python manage runserver 0.0.0.0:8000

I suggest to study the following books to help you know how to use django.

分類: Docker | 發佈留言


DOCKERFILE FOR PYENV ENVIRONMENT

發佈日期: 2024 年 2 月 26 日，作者: fluber
 * Use a base image with a specific version of Ubuntu

FROM ubuntu:20.04

ENV TZ = Asia\Taipei

 * Set environment variables for non-interactive apt installation

ENV DEBIAN_FRONTEND=noninteractive

 * Install essential packages

RUN apt-get update && \
apt-get install -y \
build-essential \
libssl-dev \
zlib1g-dev \
libbz2-dev \
libreadline-dev \
libsqlite3-dev \
wget \
curl \
llvm \
libncurses5-dev \
libncursesw5-dev \
xz-utils \
tk-dev \
libffi-dev \
liblzma-dev \
python3-venv \
sudo \
git \
tree \
vim \
&& rm -rf /var/lib/apt/lists/*

 * Switch to the /home directory

RUN useradd -m -s /bin/bash fluber && \
usermod -aG sudo fluber

 * Set a password for the ‘fluber’ user (change ‘password’ to your desired
   password)

RUN echo ‘fluber:123456’ | chpasswd

 * Switch to the ‘fluber’ user

USER fluber

 * Set the working directory to the home directory of the ‘fluber’ user

WORKDIR /home/fluber

 * Install pyenv

RUN git clone https://github.com/pyenv/pyenv.git ~/.pyenv

 * Add pyenv to the PATH

ENV PATH=”/home/fluber/.pyenv/bin:${PATH}”
RUN echo ‘export PYENV_ROOT=”/home/fluber/.pyenv”‘ >> ~/.bashrc
RUN echo ‘export PATH=”$PYENV_ROOT/bin:$PATH”‘ >> ~/.bashrc
RUN echo ‘eval “$(pyenv init –path)”‘ >> ~/.bashrc
RUN echo ‘eval “$(pyenv init -)”‘ >> ~/.bashrc

 * Install Python 3.8.12 and set it as the default version

RUN pyenv install 3.8.12 && \
pyenv global 3.8.12

 * Create a user named ‘fluber’ with sudo permissions

 * Expose any ports you need for your application (if applicable)

 * EXPOSE …

 * Start a bash shell when the container runs

CMD [“/bin/bash”]

分類: Django | 發佈留言


使用NPX REACT-NATIVE INIT PROJECT的方式時，當加入@REACT-NAVIGATION/BOTTOM-TABS時其圖示無法顯示的問題？

發佈日期: 2023 年 12 月 15 日，作者: fluber

安裝Package
npm install --save react-native-vector-icons @types/react-native-vector-icons

在 android > app > build.gradle 檔案加入下列一行∶
apply from: file("../../node_modules/react-native-vector-icons/fonts.gradle")


使用xode打開 ios > project.xcworkspace，如下圖所示新建資料夾Fonts。再將node_modules >
react-native-vector-icons > Fonts >Ionicons.ttf 檔案拖拉到xcode專案中的Fonts資料夾下。

在下圖XCode專案中的Info中，新建Fonts provided by application類別，並在此類別下新增一個Item
0值為Ionicons.ttf

下方Tab的圖示就可以正常顯示。

分類: React-Native | 發佈留言


JAVA版本工具SDKMAN

發佈日期: 2023 年 12 月 12 日，作者: fluber

執行指令∶ curl -s “https://get.sdkman.io” | bash

下列Statement將會加入~/.zshrc中

查詢可安裝的Java版本

安裝Java

sdk install java Identifier (上表最後一欄的值)

切換Java版本

sdk use java Identifier

分類: React-Native | 發佈留言


安裝NVM環境

發佈日期: 2023 年 12 月 11 日，作者: fluber

作業環境∶ OSX，Homebew

安裝指令∶brew install nvm

執行指令：nvm -h, 瞭解nvm 命令功能

執行指令：nvm ls-remote –lts, 查詢官網長期維護版本

執行指令∶ nvm install v16.20.2

執行指令：nvm ls, 查詢目前電腦系統上所安裝的版本清單及正在使用的是那個版本

執行指令：nvm use, 指定所要使用的版本

分類: React-Native | 發佈留言
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