feat: 班级管理增加分配目标功能，支持批量分配目标给班级所有学员

app/routes/classes.py

@@ -1,8 +1,9 @@
 # 班级管理路由
 
 from flask import request, jsonify, render_template, session
+from datetime import datetime, timedelta
 from app.routes import main_bp
-from app.models import db, Class, Student
+from app.models import db, Class, Student, StudentGoal, Goal
 from app.routes.auth import login_required_json, admin_required
 import logging
 
@@ -149,3 +150,77 @@ def api_classes_assign(class_id):
         db.session.rollback()
         logger.error(f"分配学员失败: {str(e)}")
         return jsonify({"error": "操作失败，请稍后重试", "code": "SERVER_ERROR"}), 500
+
+
+@main_bp.route("/api/classes/<int:class_id>/goals", methods=["POST"])
+@login_required_json
+def api_classes_assign_goals(class_id):
+    """批量分配目标给班级所有学员"""
+    cls = Class.query.get_or_404(class_id)
+    data = request.get_json()
+
+    goal_id = data.get("goal_id")
+    assessment_days = data.get("assessment_days")
+    assessment_date = data.get("assessment_date")
+    start_date = data.get("start_date")
+    start_now = data.get("start_now", True)
+
+    if not goal_id:
+        return jsonify({"error": "请选择目标", "code": "VALIDATION_ERROR"}), 400
+    if not assessment_days and not assessment_date:
+        return jsonify({"error": "请选择评估方式", "code": "VALIDATION_ERROR"}), 400
+
+    # 检查目标是否存在
+    goal = Goal.query.get(goal_id)
+    if not goal:
+        return jsonify({"error": "目标不存在", "code": "NOT_FOUND"}), 404
+
+    # 获取班级所有学员
+    students = Student.query.filter_by(class_id=class_id).all()
+    if not students:
+        return jsonify({"error": "班级没有学员", "code": "NO_STUDENTS"}), 400
+
+    # 处理评估日期
+    final_assessment_date = None
+    if assessment_date:
+        final_assessment_date = datetime.fromisoformat(assessment_date)
+    elif assessment_days:
+        final_assessment_date = datetime.now() + timedelta(days=int(assessment_days))
+
+    # 处理开始日期
+    final_start_date = None
+    if start_date:
+        final_start_date = datetime.fromisoformat(start_date)
+    elif start_now:
+        final_start_date = datetime.now()
+
+    # 批量创建 StudentGoal
+    assigned_count = 0
+    skipped = []
+    for student in students:
+        # 检查是否已分配
+        existing = StudentGoal.query.filter_by(student_id=student.id, goal_id=goal_id).first()
+        if existing:
+            skipped.append(student.name)
+            continue
+
+        record = StudentGoal(
+            student_id=student.id,
+            goal_id=goal_id,
+            start_date=final_start_date,
+            assessment_date=final_assessment_date
+        )
+        db.session.add(record)
+        assigned_count += 1
+
+    try:
+        db.session.commit()
+        result = {"message": f"成功分配 {assigned_count} 个学员", "assigned": assigned_count}
+        if skipped:
+            result["skipped"] = skipped
+            result["skipped_count"] = len(skipped)
+        return jsonify(result)
+    except Exception as e:
+        db.session.rollback()
+        logger.error(f"分配目标失败: {str(e)}")
+        return jsonify({"error": "操作失败，请稍后重试", "code": "SERVER_ERROR"}), 500