ManyToManyField 예시 추가

askcompany-kr · Feb 2, 2020 · 50d6578 · 50d6578
1 parent 78a9337
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diff --git a/ManyToManyField Demo.ipynb b/ManyToManyField Demo.ipynb
@@ -0,0 +1,344 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import os\n",
+    "os.environ['DJANGO_SETTINGS_MODULE'] = 'askcompany.settings'\n",
+    "os.environ[\"DJANGO_ALLOW_ASYNC_UNSAFE\"] = \"true\"\n",
+    "\n",
+    "import django\n",
+    "django.setup()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from instagram.models import Post, Tag"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "<Post: 네 번째 포스팅>"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "post = Post.objects.first()\n",
+    "post"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "<QuerySet [<Tag: 파이썬>]>"
+      ]
+     },
+     "execution_count": 4,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "post.tag_set.all()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "<Tag: 장고>"
+      ]
+     },
+     "execution_count": 8,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "Tag.objects.create(name='장고')"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "<Tag: AskCompany>"
+      ]
+     },
+     "execution_count": 9,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "Tag.objects.create(name='AskCompany')"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "<QuerySet [<Tag: 파이썬>, <Tag: 장고>, <Tag: AskCompany>]>"
+      ]
+     },
+     "execution_count": 10,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "Tag.objects.all()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "<Tag: 파이썬>"
+      ]
+     },
+     "execution_count": 6,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "tag = Tag.objects.first()\n",
+    "tag"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "<QuerySet [<Post: 네 번째 포스팅>]>"
+      ]
+     },
+     "execution_count": 7,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "tag.post_set.all()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "<QuerySet [<Tag: 파이썬>]>"
+      ]
+     },
+     "execution_count": 11,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "post.tag_set.all()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 25,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# tag = Tag.objects.get(name='장고')\n",
+    "# post.tag_set.remove(tag)\n",
+    "\n",
+    "tag_qs = Tag.objects.all()\n",
+    "post.tag_set.add(*tag_qs)  # unpack"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 26,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "<QuerySet [<Tag: 파이썬>, <Tag: 장고>, <Tag: AskCompany>]>"
+      ]
+     },
+     "execution_count": 26,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "post.tag_set.all()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 27,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def myfn(a, b, c):\n",
+    "    print(f\"a = {a}, b = {b}, c = {c}\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 28,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "a = 1, b = 2, c = 3\n"
+     ]
+    }
+   ],
+   "source": [
+    "myfn(1, 2, 3)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 30,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "a = 1, b = 2, c = 3\n"
+     ]
+    }
+   ],
+   "source": [
+    "params = [1, 2, 3]\n",
+    "myfn(*params)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.7.6"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}
diff --git a/instagram/admin.py b/instagram/admin.py
@@ -1,7 +1,7 @@
 from django.contrib import admin
 from django.utils.safestring import mark_safe
 
-from .models import Post, Comment
+from .models import Post, Comment, Tag
 
 
 @admin.register(Post)  # Wrapping
@@ -23,3 +23,8 @@ def message_length(self, post):
 @admin.register(Comment)
 class CommentAdmin(admin.ModelAdmin):
     pass
+
+
+@admin.register(Tag)
+class TagAdmin(admin.ModelAdmin):
+    pass
diff --git a/instagram/migrations/0006_auto_20200202_0854.py b/instagram/migrations/0006_auto_20200202_0854.py
@@ -0,0 +1,31 @@
+# Generated by Django 3.0.2 on 2020-02-02 08:54
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('instagram', '0005_post_author'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Tag',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=50, unique=True)),
+            ],
+        ),
+        migrations.AlterField(
+            model_name='comment',
+            name='post',
+            field=models.ForeignKey(limit_choices_to={'is_public': True}, on_delete=django.db.models.deletion.CASCADE, to='instagram.Post'),
+        ),
+        migrations.AddField(
+            model_name='post',
+            name='tag_set',
+            field=models.ManyToManyField(blank=True, to='instagram.Tag'),
+        ),
+    ]