实现搜索功能

1. 准备视图函数search()
2. 修改base.html 中搜索输入框所在的
   1. <form action="{{ url_for(‘search‘) }}" method="get">
   2.    <input name="q" type="text" placeholder="请输入关键字">
      
      
3. 完成视图函数search()
   1. 获取搜索关键字
      q = request.args.get(‘q’)
   2. 条件查询
      qu = Question.query.filter(Question.title.contains(q)).order_by(‘-creat_time’)
   3. 加载查询结果：
      return render_template(‘index.html‘, question=qu）
      
      
4. 组合条件查询
   from sqlalchemy import or_, and_

示例：

Lobby.query.filter(

    or_(

        and_(

            Lobby.id == Team.lobby_id,

            LobbyPlayer.team_id == Team.id,

            LobbyPlayer.player_id == player.steamid

        ),

      and_(

            Lobby.id == spectator_table.c.lobby_id,

            spectator_table.c.player_id == player.steamid

        )

    )

)

https://stackoverflow.com/questions/13370993/sqlalchemy-query-and-or-issue

@app.route(‘/search/‘)
def search():
    qu=request.args.get(‘q‘)
    ques=Question.query.filter(
        or_(
            Question.title.contains(qu),
            Question.detail.contains(qu)
        )
     ).order_by(‘-create_time‘)
    return render_template(‘base.html‘,questions=ques)

<form action="{{url_for(‘search‘)}}" method="get">
        <input name="q" type="text" placeholder="请输入关键字">
        <button type="submit" >搜索</button>
        </form>