News_Flask_sss/app/modules/index/views.py

from app import constants
from app.models import User, News, Category
from app.utils.response_code import RET
from . import index_bp
from flask import render_template, current_app, session, request, jsonify


@index_bp.route('/')
def index():
    # 获取到当前登录用户的id
    user_id = session.get("user_id")
    # 通过id获取用户信息
    user = None  # type = User
    if user_id:
        try:
            user = User.query.get(user_id)
        except Exception as e:
            current_app.logger.error(e)

    # 获取点击排行数据
    new_list = None
    try:
        new_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)

    click_news_list = []
    for news in new_list if new_list else []:
        click_news_list.append(news.to_basic_dict())

    # 获取新闻分类数据
    categories = Category.query.all()
    # 定义列表保存分类数据
    categories_dicts = []
    for category in categories:
        # 拼接内容
        # print(category)
        categories_dicts.append(category.to_dict())

    data = {
        'user_info': user.to_dict() if user else None,
        'click_news_list': click_news_list,
        'categories': categories_dicts
    }

    return render_template("news/index.html", data=data)


@index_bp.route('/favicon.ico')
def favicon():
    return current_app.send_static_file("news/favicon.ico")


@index_bp.route('/newslist')
def get_news_list():
    """
    获取指定分类的新闻列表
    1.获取参数
    2.校验参数
    3.查询数据
    4.返回数据
    :return:
    """
    # 1.获取参数
    args_dict = request.args
    page = args_dict.get("page", "1")
    per_page = args_dict.get("per_page", constants.HOME_PAGE_MAX_NEWS)
    category_id = args_dict.get("cid", "1")

    # 2.校验参数
    try:
        page = int(page)
        per_page = int(per_page)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 3.查询数据并分页
    filters = []
    # 如果不分类id不为1,那么添加分类id的过滤
    if category_id != "1":
        filters.append(News.category_id == category_id)

    try:
        paginate = News.query.filter(*filters).order_by(News.create_time.desc()).paginate(page, per_page, False)
        # 获取查询出来的数据
        items = paginate.items
        # 获取到总页数
        total_page = paginate.pages
        # 获取到当前页数
        current_page = paginate.page
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询失败")

    news_lst = []
    for news in items:
        news_lst.append(news.to_dict())

    data = {
        "news_list": news_lst,
        "current_page": current_page,
        "total_page": total_page
    }

    return jsonify(errno=RET.OK, errmsg="查询新闻列表数据成功", data=data)