step 2 with basic crud implemented

app/templates/subitems/form.html

@@ -0,0 +1,27 @@
+{% extends "base.html" %}
+
+{% block content %}
+<div class="page-header">
+    <div>
+        <h1>{{ page_title }}</h1>
+        <p class="muted">上级物品：<a href="/items/{{ item.id }}">{{ item.name }}</a></p>
+    </div>
+    <a href="/items/{{ item.id }}">返回物品</a>
+</div>
+
+<form method="post" action="{{ form_action }}" class="stack">
+    <label>
+        名称
+        <input type="text" name="name" value="{{ subitem.name if subitem else '' }}" required>
+    </label>
+    <label>
+        数量
+        <input type="number" name="quantity" min="0" value="{{ subitem.quantity if subitem and subitem.quantity is not none else '' }}">
+    </label>
+    <label>
+        备注
+        <textarea name="note" rows="4">{{ subitem.note if subitem and subitem.note else '' }}</textarea>
+    </label>
+    <button type="submit">{{ submit_label }}</button>
+</form>
+{% endblock %}