Flask传递数据到模板

# blog_views.py
from flask import render_template, request
from models import Post, User, Comment
from utils import paginate_query

@app.route('/blog')
def blog_index():
    """博客首页"""
    page = request.args.get('page', 1, type=int)

    # 获取分页数据
    posts_query = Post.query.filter_by(published=True).order_by(Post.created_at.desc())
    pagination = paginate_query(posts_query, page, per_page=10)

    # 获取热门文章
    popular_posts = Post.get_popular_posts(limit=5)

    # 获取标签云
    tags = Post.get_tag_cloud()

    # 获取统计数据
    stats = {
        'total_posts': Post.query.count(),
        'total_comments': Comment.query.count(),
        'total_authors': User.query.count()
    }

    return render_template(
        'blog/index.html',
        posts=pagination.items,  # 当前页的文章
        pagination=pagination,   # 分页对象
        popular_posts=popular_posts,
        tags=tags,
        stats=stats,
        current_year=datetime.now().year,
        page_title='博客首页',
        meta_description='欢迎访问我们的技术博客，分享编程技巧和开发经验。'
    )

@app.route('/blog/<slug>')
def blog_post(slug):
    """博客文章详情页"""
    post = Post.query.filter_by(slug=slug).first_or_404()

    # 增加阅读量
    post.increment_views()

    # 获取相关文章
    related_posts = post.get_related_posts(limit=3)

    # 获取文章评论
    comments = post.get_comments(approved_only=True)

    # 获取作者信息
    author = post.author

    return render_template(
        'blog/post.html',
        post=post,
        related_posts=related_posts,
        comments=comments,
        author=author,
        page_title=post.title,
        meta_description=post.excerpt,
        meta_keywords=','.join([tag.name for tag in post.tags])
    )

<!-- blog/index.html -->
{% extends "base.html" %}

{% block title %}{{ page_title }}{% endblock %}

{% block content %}
<div class="row">
    <!-- 左侧：文章列表 -->
    <div class="col-md-8">
        <h1>技术博客</h1>
        <p class="lead">共有 {{ stats.total_posts }} 篇文章</p>

        {% for post in posts %}
            <article class="blog-post">
                <h2>
                    <a href="{{ url_for('blog_post', slug=post.slug) }}">
                        {{ post.title }}
                    </a>
                </h2>

                <div class="post-meta">
                    <span>
                        <i class="fas fa-user"></i>
                        {{ post.author.username }}
                    </span>
                    <span>
                        <i class="fas fa-calendar"></i>
                        {{ post.created_at|date('Y-m-d') }}
                    </span>
                    <span>
                        <i class="fas fa-eye"></i>
                        {{ post.views }} 阅读
                    </span>
                </div>

                <p>{{ post.excerpt|truncate(200) }}</p>

                <div class="post-tags">
                    {% for tag in post.tags %}
                        <a href="{{ url_for('tag_posts', tag=tag.slug) }}"
                           class="badge bg-secondary">
                            {{ tag.name }}
                        </a>
                    {% endfor %}
                </div>
            </article>
        {% endfor %}

        <!-- 分页导航 -->
        {% if pagination.pages > 1 %}
            <nav aria-label="Page navigation">
                <ul class="pagination">
                    {% if pagination.has_prev %}
                        <li class="page-item">
                            <a class="page-link"
                               href="?page={{ pagination.prev_num }}">
                                上一页
                            </a>
                        </li>
                    {% endif %}

                    {% for page_num in pagination.iter_pages() %}
                        <li class="page-item {{ 'active' if page_num == pagination.page else '' }}">
                            <a class="page-link" href="?page={{ page_num }}">
                                {{ page_num }}
                            </a>
                        </li>
                    {% endfor %}

                    {% if pagination.has_next %}
                        <li class="page-item">
                            <a class="page-link"
                               href="?page={{ pagination.next_num }}">
                                下一页
                            </a>
                        </li>
                    {% endif %}
                </ul>
            </nav>
        {% endif %}
    </div>

    <!-- 右侧：侧边栏 -->
    <div class="col-md-4">
        <!-- 热门文章 -->
        <div class="sidebar-widget">
            <h3>热门文章</h3>
            <ul>
                {% for post in popular_posts %}
                    <li>
                        <a href="{{ url_for('blog_post', slug=post.slug) }}">
                            {{ post.title }}
                        </a>
                    </li>
                {% endfor %}
            </ul>
        </div>

        <!-- 标签云 -->
        <div class="sidebar-widget">
            <h3>标签云</h3>
            <div class="tag-cloud">
                {% for tag in tags %}
                    <a href="{{ url_for('tag_posts', tag=tag.slug) }}"
                       style="font-size: {{ tag.font_size }}px;">
                        {{ tag.name }}
                    </a>
                {% endfor %}
            </div>
        </div>
    </div>
</div>
{% endblock %}