creation export_to_csv_file function in OrderAdmin for export data to…

… csv file

order/admin.py

@@ -1,3 +1,7 @@
+import csv
+import datetime
+from django.http import HttpResponse
+
 from django.contrib import admin
 from django.utils.safestring import mark_safe
 
@@ -13,6 +17,36 @@ def order_payment(obj):
 
 order_payment.short_description = 'Stripe Payment'
 
+
+def export_to_csv_file(admin_model, request, queryset):
+    '''
+    This function is for export data to csv file.
+    '''
+
+    opts = admin_model.model._meta
+    content_disposition = f'attachment; filename={opts.verbose_name}.csv'
+    response = HttpResponse(content_type='text/csv')
+    response['Content-Disposition'] = content_disposition
+    writer = csv.writer(response)
+    fields = [field for field in opts.get_fields() if not field.many_to_many and not field.one_to_many]
+    # write the first row with header information
+    writer.writerow(
+        [field.verbose_name for field in fields]
+    )
+    # write data rows 
+    for obj in queryset:
+        data_row = []
+        for field in fields:
+            value = getattr(obj, field.name)
+            if isinstance(value, datetime.datetime):
+                value = value.strftime('%d/%m/%Y')
+            data_row.append(value)
+        writer.writerow(data_row)
+    return response
+
+export_to_csv_file.short_description = 'Export To CSV'
+
+
 class OrderItemInline(admin.TabularInline):
     model = OrderItem
     raw_id_fields = ['product']
@@ -32,3 +66,4 @@ class OrderAdmin(admin.ModelAdmin):
 
     list_filter = ['email', 'paid', 'create_at', 'update_at']
     inlines = [OrderItemInline]
+    actions  = [export_to_csv_file]