feat: 添加目标管理CRUD API和关联蓝图

app/routes/goals.py

@@ -0,0 +1,114 @@
+from flask import Blueprint, request, jsonify
+from app.models import db, Goal
+from app.routes.auth import login_required_json
+
+goals_bp = Blueprint("goals", __name__)
+
+@goals_bp.route("/api/goals", methods=["GET"])
+@login_required_json
+def get_goals():
+    goals = Goal.query.order_by(Goal.created_at.desc()).all()
+    return jsonify([g.to_dict() for g in goals])
+
+@goals_bp.route("/api/goals", methods=["POST"])
+@login_required_json
+def create_goal():
+    data = request.get_json()
+    goal = Goal(name=data["name"], content=data.get("content", ""))
+    db.session.add(goal)
+    db.session.commit()
+    return jsonify(goal.to_dict()), 201
+
+@goals_bp.route("/api/goals/<int:goal_id>", methods=["GET"])
+@login_required_json
+def get_goal(goal_id):
+    goal = Goal.query.get_or_404(goal_id)
+    return jsonify(goal.to_dict())
+
+@goals_bp.route("/api/goals/<int:goal_id>", methods=["PUT"])
+@login_required_json
+def update_goal(goal_id):
+    goal = Goal.query.get_or_404(goal_id)
+    data = request.get_json()
+    if "name" in data:
+        goal.name = data["name"]
+    if "content" in data:
+        goal.content = data["content"]
+    db.session.commit()
+    return jsonify(goal.to_dict())
+
+@goals_bp.route("/api/goals/<int:goal_id>", methods=["DELETE"])
+@login_required_json
+def delete_goal(goal_id):
+    goal = Goal.query.get_or_404(goal_id)
+    db.session.delete(goal)
+    db.session.commit()
+    return jsonify({"message": "删除成功"})
+
+# ===== 以下是 Task 3 的循环检测和关联 API =====
+
+def _has_cycle(parent_id, child_id):
+    """检测添加 child_id 作为 parent_id 的子目标是否会形成循环"""
+    visited = set()
+    stack = [child_id]
+    while stack:
+        current = stack.pop()
+        if current == parent_id:
+            return True
+        if current in visited:
+            continue
+        visited.add(current)
+        from app.models import GoalRelation
+        for rel in GoalRelation.query.filter_by(parent_goal_id=current).all():
+            stack.append(rel.child_goal_id)
+    return False
+
+@goals_bp.route("/api/goals/<int:goal_id>/children", methods=["GET"])
+@login_required_json
+def get_goal_children(goal_id):
+    from app.models import GoalRelation
+    relations = GoalRelation.query.filter_by(parent_goal_id=goal_id).all()
+    child_ids = [r.child_goal_id for r in relations]
+    children = Goal.query.filter(Goal.id.in_(child_ids)).all() if child_ids else []
+    return jsonify([c.to_dict() for c in children])
+
+@goals_bp.route("/api/goals/<int:goal_id>/parents", methods=["GET"])
+@login_required_json
+def get_goal_parents(goal_id):
+    from app.models import GoalRelation
+    relations = GoalRelation.query.filter_by(child_goal_id=goal_id).all()
+    parent_ids = [r.parent_goal_id for r in relations]
+    parents = Goal.query.filter(Goal.id.in_(parent_ids)).all() if parent_ids else []
+    return jsonify([p.to_dict() for p in parents])
+
+@goals_bp.route("/api/goals/<int:goal_id>/children", methods=["POST"])
+@login_required_json
+def add_goal_child(goal_id):
+    from app.models import GoalRelation
+    data = request.get_json()
+    child_id = data["child_goal_id"]
+
+    if goal_id == child_id:
+        return jsonify({"error": "不能将目标关联到自身"}), 400
+
+    if _has_cycle(goal_id, child_id):
+        return jsonify({"error": "添加此关联会形成循环引用"}), 400
+
+    existing = GoalRelation.query.filter_by(parent_goal_id=goal_id, child_goal_id=child_id).first()
+    if existing:
+        return jsonify({"error": "关联已存在"}), 400
+
+    relation = GoalRelation(parent_goal_id=goal_id, child_goal_id=child_id)
+    db.session.add(relation)
+    db.session.commit()
+    return jsonify({"message": "添加成功"})
+
+@goals_bp.route("/api/goals/<int:goal_id>/children/<int:child_id>", methods=["DELETE"])
+@login_required_json
+def remove_goal_child(goal_id, child_id):
+    from app.models import GoalRelation
+    relation = GoalRelation.query.filter_by(parent_goal_id=goal_id, child_goal_id=child_id).first()
+    if relation:
+        db.session.delete(relation)
+        db.session.commit()
+    return jsonify({"message": "移除成功"})