Day 8 完了

実装内容:
1. frontend/src/types/index.ts - 型定義（Field, Crop, Variety, Plan）
2. frontend/src/components/Navbar.tsx - ナビゲーションバー（ログアウトボタン）
3. backend/apps/fields/views.py - FieldViewSet追加
4. backend/apps/fields/serializers.py - 新規作成（Fieldシリアライザー）
5. backend/apps/fields/urls.py - ViewSetルート追加
6. frontend/src/app/allocation/page.tsx - 作付け計画画面（作物・品種選択可能）
7. frontend/src/app/page.tsx - 自動リダイレクト（ログイン状態による）
API動作確認:
- /api/fields/ → HTTP 200（圃場データなし）
- /api/plans/crops/ → HTTP 200（2作物：水稲・大豆）
- /api/plans/?year=2025 → HTTP 200
テスト: http://localhost:3000/ → 自動リダイレクトで /login または /allocation
※ 現在圃場データがないため、画面には「圃場データがありません。インポートを実行してください。」と表示されます。
次の工程に移りますか？

backend/apps/fields/serializers.py

@@ -0,0 +1,23 @@
+from rest_framework import serializers
+from .models import Field, OfficialKyosaiField, OfficialChusankanField
+
+
+class OfficialKyosaiFieldSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = OfficialKyosaiField
+        fields = ['id', 'k_num', 's_num', 'address', 'kanji_name', 'area']
+
+
+class OfficialChusankanFieldSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = OfficialChusankanField
+        fields = ['id', 'c_id', 'oaza', 'aza', 'chiban', 'area', 'payment_amount']
+
+
+class FieldSerializer(serializers.ModelSerializer):
+    kyosai_fields = OfficialKyosaiFieldSerializer(many=True, read_only=True)
+    chusankan_fields = OfficialChusankanFieldSerializer(many=True, read_only=True)
+
+    class Meta:
+        model = Field
+        fields = ['id', 'name', 'address', 'area_tan', 'area_m2', 'owner_name', 'kyosai_fields', 'chusankan_fields']

backend/apps/fields/urls.py

@@ -1,7 +1,12 @@
-from django.urls import path
+from django.urls import path, include
+from rest_framework.routers import DefaultRouter
 from . import views
 
+router = DefaultRouter()
+router.register(r'', views.FieldViewSet, basename='field')
+
 urlpatterns = [
+    path('', include(router.urls)),
     path('import/kyosai/', views.import_kyosai_master, name='import_kyosai'),
     path('import/yoshida/', views.import_yoshida_fields, name='import_yoshida'),
 ]

backend/apps/fields/views.py

@@ -2,7 +2,16 @@ import pandas as pd
 from django.http import JsonResponse
 from django.views.decorators.csrf import csrf_exempt
 from django.views.decorators.http import require_http_methods
+from rest_framework import viewsets, permissions
+from rest_framework.decorators import action
 from .models import OfficialKyosaiField, OfficialChusankanField, Field
+from .serializers import FieldSerializer
+
+
+class FieldViewSet(viewsets.ReadOnlyModelViewSet):
+    queryset = Field.objects.all()
+    serializer_class = FieldSerializer
+    permission_classes = [permissions.AllowAny]
 
 
 @csrf_exempt

frontend/src/app/allocation/page.tsx

@@ -0,0 +1,265 @@
+'use client';
+
+import { useState, useEffect } from 'react';
+import { api } from '@/lib/api';
+import { Field, Crop, Plan } from '@/types';
+import Navbar from '@/components/Navbar';
+
+export default function AllocationPage() {
+  const [fields, setFields] = useState<Field[]>([]);
+  const [crops, setCrops] = useState<Crop[]>([]);
+  const [plans, setPlans] = useState<Plan[]>([]);
+  const [year, setYear] = useState<number>(2025);
+  const [loading, setLoading] = useState(true);
+  const [saving, setSaving] = useState<number | null>(null);
+
+  useEffect(() => {
+    fetchData();
+  }, [year]);
+
+  const fetchData = async () => {
+    setLoading(true);
+    try {
+      const [fieldsRes, cropsRes, plansRes] = await Promise.all([
+        api.get('/fields/'),
+        api.get('/plans/crops/'),
+        api.get(`/plans/?year=${year}`),
+      ]);
+      setFields(fieldsRes.data);
+      setCrops(cropsRes.data);
+      setPlans(plansRes.data);
+    } catch (error) {
+      console.error('Failed to fetch data:', error);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  const getPlanForField = (fieldId: number): Plan | undefined => {
+    return plans.find((p) => p.field === fieldId);
+  };
+
+  const handleCropChange = async (fieldId: number, cropId: string) => {
+    const crop = parseInt(cropId);
+    if (!crop) {
+      return;
+    }
+
+    const existingPlan = getPlanForField(fieldId);
+    setSaving(fieldId);
+
+    try {
+      if (existingPlan) {
+        await api.patch(`/plans/${existingPlan.id}/`, {
+          crop,
+          variety: null,
+          notes: existingPlan.notes,
+        });
+      } else {
+        await api.post('/plans/', {
+          field: fieldId,
+          year,
+          crop,
+          variety: null,
+          notes: '',
+        });
+      }
+      await fetchData();
+    } catch (error) {
+      console.error('Failed to save crop:', error);
+    } finally {
+      setSaving(null);
+    }
+  };
+
+  const handleVarietyChange = async (fieldId: number, varietyId: string) => {
+    const variety = parseInt(varietyId) || null;
+    const existingPlan = getPlanForField(fieldId);
+
+    if (!existingPlan || !existingPlan.crop) {
+      return;
+    }
+
+    setSaving(fieldId);
+
+    try {
+      await api.patch(`/plans/${existingPlan.id}/`, {
+        variety,
+        notes: existingPlan.notes,
+      });
+      await fetchData();
+    } catch (error) {
+      console.error('Failed to save variety:', error);
+    } finally {
+      setSaving(null);
+    }
+  };
+
+  const handleNotesChange = async (fieldId: number, notes: string) => {
+    const existingPlan = getPlanForField(fieldId);
+
+    if (!existingPlan) {
+      return;
+    }
+
+    setSaving(fieldId);
+
+    try {
+      await api.patch(`/plans/${existingPlan.id}/`, {
+        notes,
+      });
+      await fetchData();
+    } catch (error) {
+      console.error('Failed to save notes:', error);
+    } finally {
+      setSaving(null);
+    }
+  };
+
+  const getVarietiesForCrop = (cropId: number): typeof crops[0]['varieties'] => {
+    const crop = crops.find((c) => c.id === cropId);
+    return crop?.varieties || [];
+  };
+
+  if (loading) {
+    return (
+      <div className="min-h-screen bg-gray-50">
+        <Navbar />
+        <div className="flex items-center justify-center h-64">
+          <div className="text-gray-500">読み込み中...</div>
+        </div>
+      </div>
+    );
+  }
+
+  return (
+    <div className="min-h-screen bg-gray-50">
+      <Navbar />
+      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
+        <div className="mb-6 flex items-center justify-between">
+          <h1 className="text-2xl font-bold text-gray-900">作付け計画</h1>
+          <div className="flex items-center gap-2">
+            <label htmlFor="year" className="text-sm font-medium text-gray-700">
+              作付年度:
+            </label>
+            <select
+              id="year"
+              value={year}
+              onChange={(e) => setYear(parseInt(e.target.value))}
+              className="px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-green-500"
+            >
+              <option value={2025}>2025年</option>
+              <option value={2026}>2026年</option>
+              <option value={2027}>2027年</option>
+            </select>
+          </div>
+        </div>
+
+        {fields.length === 0 ? (
+          <div className="bg-white rounded-lg shadow p-8 text-center">
+            <p className="text-gray-500">
+              圃場データがありません。インポートを実行してください。
+            </p>
+          </div>
+        ) : (
+          <div className="bg-white rounded-lg shadow overflow-hidden">
+            <div className="overflow-x-auto">
+              <table className="min-w-full divide-y divide-gray-200">
+                <thead className="bg-gray-50">
+                  <tr>
+                    <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
+                      圃場名
+                    </th>
+                    <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
+                      面積(反)
+                    </th>
+                    <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
+                      作物
+                    </th>
+                    <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
+                      品種
+                    </th>
+                    <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
+                      備考
+                    </th>
+                  </tr>
+                </thead>
+                <tbody className="bg-white divide-y divide-gray-200">
+                  {fields.map((field) => {
+                    const plan = getPlanForField(field.id);
+                    const selectedCropId = plan?.crop || 0;
+                    const selectedVarietyId = plan?.variety || 0;
+
+                    return (
+                      <tr key={field.id} className="hover:bg-gray-50">
+                        <td className="px-6 py-4 whitespace-nowrap">
+                          <div className="text-sm font-medium text-gray-900">
+                            {field.name}
+                          </div>
+                          <div className="text-xs text-gray-500">
+                            {field.address}
+                          </div>
+                        </td>
+                        <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-500">
+                          {field.area_tan}
+                        </td>
+                        <td className="px-6 py-4 whitespace-nowrap">
+                          <select
+                            value={selectedCropId || ''}
+                            onChange={(e) =>
+                              handleCropChange(field.id, e.target.value)
+                            }
+                            disabled={saving === field.id}
+                            className="px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-green-500 text-sm disabled:opacity-50"
+                          >
+                            <option value="">選択してください</option>
+                            {crops.map((crop) => (
+                              <option key={crop.id} value={crop.id}>
+                                {crop.name}
+                              </option>
+                            ))}
+                          </select>
+                        </td>
+                        <td className="px-6 py-4 whitespace-nowrap">
+                          <select
+                            value={selectedVarietyId || ''}
+                            onChange={(e) =>
+                              handleVarietyChange(field.id, e.target.value)
+                            }
+                            disabled={
+                              saving === field.id || !selectedCropId
+                            }
+                            className="px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-green-500 text-sm disabled:opacity-50 disabled:bg-gray-100"
+                          >
+                            <option value="">選択してください</option>
+                            {getVarietiesForCrop(selectedCropId).map((variety) => (
+                              <option key={variety.id} value={variety.id}>
+                                {variety.name}
+                              </option>
+                            ))}
+                          </select>
+                        </td>
+                        <td className="px-6 py-4">
+                          <input
+                            type="text"
+                            value={plan?.notes || ''}
+                            onChange={(e) =>
+                              handleNotesChange(field.id, e.target.value)
+                            }
+                            disabled={saving === field.id || !plan}
+                            placeholder="備考を入力"
+                            className="px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-green-500 text-sm w-full disabled:opacity-50 disabled:bg-gray-100"
+                          />
+                        </td>
+                      </tr>
+                    );
+                  })}
+                </tbody>
+              </table>
+            </div>
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}

frontend/src/app/page.tsx

@@ -1,32 +1,23 @@
+'use client';
+
+import { useEffect } from 'react';
+import { useRouter } from 'next/navigation';
+
 export default function Home() {
+  const router = useRouter();
+
+  useEffect(() => {
+    const token = localStorage.getItem('accessToken');
+    if (token) {
+      router.push('/allocation');
+    } else {
+      router.push('/login');
+    }
+  }, [router]);
+
   return (
-    <main className="flex min-h-screen flex-col items-center justify-between p-24">
-      <div className="z-10 max-w-5xl w-full items-center justify-between font-mono text-sm lg:flex">
-        <p className="fixed left-0 top-0 flex w-full justify-center border-b border-gray-300 bg-gradient-to-b from-zinc-200 pb-6 pt-8 backdrop-blur-2xl dark:border-neutral-800 dark:bg-zinc-800/30 dark:from-inherit lg:static lg:w-auto  lg:rounded-xl lg:border lg:bg-gray-200 lg:p-4 lg:dark:bg-zinc-800/30">
-          Get started by editing&nbsp;
-          <code className="font-mono font-bold">src/app/page.tsx</code>
-        </p>
+    <div className="min-h-screen flex items-center justify-center">
+      <div className="text-gray-500">読み込み中...</div>
     </div>
-
-      <div className="relative flex place-items-center before:absolute before:h-[300px] before:w-[480px] before:-translate-x-1/2 before:rounded-full before:bg-gradient-radial before:from-white before:to-transparent before:blur-2xl before:content-[''] after:absolute after:-z-20 after:h-[180px] after:w-[240px] after:translate-x-1/3 after:bg-gradient-conic after:from-sky-200 after:via-blue-200 after:blur-2xl after:content-[''] before:dark:bg-gradient-to-br before:dark:from-transparent before:dark:to-purple-700 before:dark:opacity-10 after:dark:from-sky-900 after:dark:via-[#0141ff] after:dark:opacity-40 before:lg:h-[360px]">
-        <h1 className="text-6xl font-bold">KeinaSystem</h1>
-      </div>
-
-      <div className="mb-32 grid text-center lg:max-w-5xl lg:w-full lg:mb-0 lg:grid-cols-4 lg:text-left">
-        <a
-          href="https://nextjs.org/docs"
-          className="group rounded-lg border border-transparent px-5 py-4 transition-colors hover:border-gray-300 hover:bg-gray-100 hover:dark:border-neutral-700 hover:dark:bg-neutral-800/30"
-          target="_blank"
-          rel="noopener noreferrer"
-        >
-          <h2 className={`mb-3 text-2xl font-semibold`}>
-            Docs <span className="inline-block transition-transform group-hover:translate-x-1 motion-reduce:transform-none">-&gt;</span>
-          </h2>
-          <p className={`m-0 max-w-[30ch] text-sm opacity-50`}>
-            Find in-depth information about Next.js features and API.
-          </p>
-        </a>
-      </div>
-    </main>
   );
 }

frontend/src/components/Navbar.tsx

@@ -0,0 +1,35 @@
+'use client';
+
+import { useRouter } from 'next/navigation';
+import { LogOut } from 'lucide-react';
+import { logout } from '@/lib/api';
+
+export default function Navbar() {
+  const router = useRouter();
+
+  const handleLogout = () => {
+    logout();
+  };
+
+  return (
+    <nav className="bg-white shadow-sm border-b border-gray-200">
+      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
+        <div className="flex justify-between h-16">
+          <div className="flex items-center">
+            <h1 className="text-xl font-bold text-green-700">KeinaSystem</h1>
+            <span className="ml-2 text-sm text-gray-500">農業管理システム</span>
+          </div>
+          <div className="flex items-center">
+            <button
+              onClick={handleLogout}
+              className="flex items-center px-4 py-2 text-sm text-gray-700 hover:text-gray-900 hover:bg-gray-100 rounded-md transition-colors"
+            >
+              <LogOut className="h-4 w-4 mr-2" />
+              ログアウト
+            </button>
+          </div>
+        </div>
+      </div>
+    </nav>
+  );
+}

frontend/src/types/index.ts

@@ -0,0 +1,53 @@
+export interface OfficialKyosaiField {
+  id: number;
+  k_num: string;
+  s_num: string | null;
+  address: string;
+  kanji_name: string;
+  area: string;
+}
+
+export interface OfficialChusankanField {
+  id: number;
+  c_id: string;
+  oaza: string;
+  aza: string;
+  chiban: string;
+  area: string;
+  payment_amount: string | null;
+}
+
+export interface Field {
+  id: number;
+  name: string;
+  address: string;
+  area_tan: string;
+  area_m2: number;
+  owner_name: string;
+  kyosai_fields: OfficialKyosaiField[];
+  chusankan_fields: OfficialChusankanField[];
+}
+
+export interface Variety {
+  id: number;
+  crop: number;
+  name: string;
+}
+
+export interface Crop {
+  id: number;
+  name: string;
+  varieties: Variety[];
+}
+
+export interface Plan {
+  id: number;
+  field: number;
+  field_name: string;
+  year: number;
+  crop: number;
+  crop_name: string;
+  variety: number;
+  variety_name: string;
+  notes: string | null;
+}