三十六、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">

      <form action="{{ url_for('search') }}" method="get"  class="navbar-form navbar-left" role="search">
                              <div class="form-group">
                                  <input name="q" type="text" class="form-control" placeholder="请输入关键字"/>
                              </div><button type="submit" class="btn btn-default">搜索</button>
                              {% endif %}
                          </form>

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
        )
    )
)

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

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