Implement CSV import

README.md

@@ -7,6 +7,17 @@ Yes, the infamous todo app.
 - Django
 - djangorestframework
 
+## Importing from CSV
+
+You can import from CSV with first line indicating name and deadline date, and
+subsequent lines indicating todo item name and status. For example:
+
+```csv
+Today list,2021-11-11
+First item,1
+Second item,0
+Third item,0
+```
 
 ## Copying
 

test.csv

@@ -0,0 +1,4 @@
+Today list,2021-11-11
+First item,1
+Second item,0
+Third item,0

todo_app/templates/base.html

@@ -19,6 +19,7 @@
 
     <!-- MAIN CONTENT -->
       <main>
+        <a href="{% url 'import' %}">Import CSV</a>
       {% block body %}
       {% endblock %}
       </main>

todo_app/templates/import.html

@@ -0,0 +1,12 @@
+{% extends 'base.html' %}
+
+{% block body %}
+
+<form method="post" action="{% url 'import' %}" enctype="multipart/form-data">
+	{% csrf_token %}
+	<label for="file">Upload CSV file</label><br>
+	<input type="file" name="file" id="file" accept="text/csv"><br>
+	<input type="submit" value="Import">
+</form>
+
+{% endblock %}

todo_app/urls.py

@@ -7,4 +7,5 @@ urlpatterns = [
     path('<int:list_id>', views.view_list, name='todo'),
     path('create', views.create_list, name='create_list'),
     path('<int:list_id>/create', views.create_item, name='create_item'),
+    path('import', views.import_csv, name='import'),
 ]

todo_app/views.py

@@ -1,4 +1,8 @@
+import csv
+
 from datetime import date
+from io import StringIO
+
 import requests
 
 from django.shortcuts import redirect, render
@@ -74,3 +78,30 @@ def create_item(request, list_id):
         'parent': list_id
     })
     return redirect('todo', list_id)
+
+
+def import_csv(request):
+    """View for importing CSV."""
+    if request.method == 'GET':
+        return render(request, 'import.html')
+    fname = request.FILES['file']
+    f = fname.read().decode('utf-8')
+    f = StringIO(f)
+    reader = csv.reader(f, delimiter=',', lineterminator='\n')
+    reader = list(reader)
+    name, valid_date = tuple(reader.pop(0))
+    print(name, valid_date)
+    endpoint = API_BASE % '/lists/'
+    response = requests.post(endpoint, json={
+        'name': name,
+        'valid_until': valid_date
+    })
+    list_id = response.json()['id']
+    for row in reader:
+        endpoint = API_BASE % '/items/'
+        name, valid_date = tuple(row)
+        response = requests.post(endpoint, json={
+            'name': name,
+            'parent': list_id
+        })
+    return redirect('todo', list_id)