Retail Website built with Django P4 (2020-02-10)

Django:

---

template {{forloop.counter0}}

{% for image in item.itemimage_set.all %}
<li data-target="#item{{item.pk}}Carousel" data-slide-to="{{forloop.counter0}}"></li>
{% endfor %}

forloop.counter0 is 0-indexed
forloop.counter is 1-indexed

more variables in forloop can be found here:

• forloop.revcounter
• forloop.revcounter0
• forloop.first
• forloop.last
• forloop.parentloop

ForeignKey.on_delete

ForeignKey takes in on_delete argument to deal with the situation where the ForeignKey object is being deleted. The value of on_delete argument represents this behaviour. There are 3 options (In the examples below, Item model has Category as a ForeignKey):

• on_delete=models.CASCADE : deleting a foreign object, i.e. a category, will automatically delete all of the items under that category
• on_delete=models.PROTECT: deleteing a foreign object, i.e. a category, will automatically prompt 'Can Not Delete' if there's items under that category, And the items will be listed
• on_delete=models.SET_NULL: deleteing a foreign object, i.e. a category, will set this foreign key to Null in all of the items originally under that category.

---

Google Font

1. Go to Google Fonts: https://fonts.google.com/
2. add the fonts for your website
3. interact with the pop up at bottom right corner
4. copy url
5. go to your css file
6. paste: @import url(...)
7. apply the font into css element as usual (font-family: 'Forum', cursive;). you can also copy this on the popup

---

Python

---

why @property decorator? SO question ref

• the function within the class can be accessed like a class' property instead of a function()

  1. you don't have to call it with () to gain access to the result
  2. you can pass parameter into it and process existing class values

  class Person(models.Model):
    first_name = models.CharField(max_length=50)
    last_name = models.CharField(max_length=50)
    birth_date = models.DateField()
  
    @property
    def full_name(self):
      "Returns the person's full name."
      return '%s %s' % (self.first_name, self.last_name)
  
    @full_name.setter
    def full_name(self, value):
       names = value.split(' ')
       self.first_name = names[0]
       self.last_name = names[1]
  

VS Code

---

Shortcuts - Find and replace:

• Find: command + F
• Add next occurrence: command + D
• Add ALL occurrences: option + Enter
• Replacement: command + option + F
• Replace: command + Enter