create Product, Category Models + create ProductAdmin, CategoryAdmin

shop/admin.py

@@ -1,3 +1,44 @@
 from django.contrib import admin
+from shop import models
 
-# Register your models here.
+
+@admin.register(models.Product)
+class ProductAdmin(admin.ModelAdmin):
+    '''
+    This class is for managing products from admin panel.
+    '''
+
+    list_display = ['owner', 'title', 'category', 'price', 'available']
+    list_filter = ['owner', 'category', 'available']
+    search_fields = ['title__icontains', 'description__icontains', 'price__icontains']
+    fields = ['cover', 'title', 'slug', 'description', 'price', 'category', 'available']
+    readonly_fields = ['owner']
+    list_per_page = 10
+    prepopulated_fields = {
+        'slug': ('title',)
+    }
+
+    def save_model(self, request, obj, form, change):
+            # change owner field to owner requested
+            obj.owner = request.user
+            return super().save_model(request, obj, form, change)
+
+
+@admin.register(models.Category)
+class CategoryAdmin(admin.ModelAdmin):
+    '''
+    This class is for managing categories from admin panel.
+    '''
+
+    list_display = ['owner', 'label']
+    fields = ['label', 'slug']
+    readonly_fields = ['owner']
+    list_per_page = 10
+    prepopulated_fields = {
+        'slug': ('label',)
+    }
+
+    def save_model(self, request, obj, form, change):
+            # change owner field to owner requested
+            obj.owner = request.user
+            return super().save_model(request, obj, form, change)

shop/models.py

@@ -1,3 +1,78 @@
 from django.db import models
+from django.contrib.auth import get_user_model
+from django.utils.text import slugify
 
-# Create your models here.
+from utils.validator import english_character_regex
+
+
+User = get_user_model()
+
+class Product(models.Model):
+    '''
+    This class is for creating Product.
+    '''
+
+    # initial information fields about product
+    cover = models.ImageField(upload_to='products/%Y/%m/%d/', blank=True)
+    title = models.CharField(max_length=200, unique=True, validators=[english_character_regex])
+    slug = models.CharField(max_length=200, unique=True)
+    description = models.TextField(blank=True)
+    price = models.DecimalField(max_digits=10, decimal_places=2)
+    available = models.BooleanField(default=True)
+
+    # relationship with other models
+    owner = models.ForeignKey(User, on_delete=models.CASCADE)
+    category = models.ForeignKey('Category', related_name='product_category', on_delete=models.CASCADE)
+
+    # create & update fields
+    create_at = models.DateTimeField(auto_now_add=True)
+    update_at = models.DateField(auto_now=True)
+
+    class Meta:
+        ordering = ['-update_at', '-create_at']
+        indexes = [
+            models.Index(fields=['id', 'slug']),
+            models.Index(fields=['title']),
+            models.Index(fields=['-update_at', '-create_at'])
+        ]
+
+    def save(self, *args, **kwargs):
+
+        # Save the slug with the title input parameter
+        if not self.slug or self.slug != self.title:
+            self.slug = slugify(self.title, allow_unicode=True)
+        super(Product, self).save(*args, **kwargs)
+
+    def __str__(self):
+        return self.title
+
+
+class Category(models.Model):
+    '''
+    This class is for sorting and categorizing products.
+    '''
+
+    # initial fields
+    label = models.CharField(max_length=200, unique=True, validators=[english_character_regex])
+    slug = models.SlugField(max_length=200, unique=True)
+
+    # relationship with other models
+    owner = models.ForeignKey(User, on_delete=models.CASCADE)
+
+    class Meta:
+        ordering = ['label']
+        indexes = [
+            models.Index(fields=['label'])
+        ]
+        verbose_name = 'category'
+        verbose_name_plural = 'categories'
+
+    def save(self, *args, **kwargs):
+
+        # Save the slug with the label input parameter
+        if not self.slug or self.slug != self.label:
+            self.slug = slugify(self.label, allow_unicode=True)
+        super(Category, self).save(*args, **kwargs)
+
+    def __str__(self):
+        return self.label

utils/validator.py

@@ -0,0 +1,6 @@
+from django.core.validators import RegexValidator
+
+english_character_regex = RegexValidator(
+    regex=r'^[a-zA-Z0-9\s\-_\.!@#\$%^&*()+=\[\]{};:,<>\?/\\]{2,200}$',
+    message='Only English letters, numbers, and spaces are allowed, and the allowed characters are between 2 and 200',
+)