无法查询和遍历数据库

Question

我试图只过滤外部 ID 为 1 的行，或者在这种情况下 'Skincare' 我都试过了，但无论我尝试什么组合，要么不应用过滤器，要么什么都不应用出现，或者我得到一个错误，它是不可迭代的。我要

@views.route("/makeup")
def makeup():
    blogs = Blog.query.filter(Blog.category_id == '1').all()
    
    for date, img, title in blogs:
        date = Blog.date
        img = Blog.fileid
        title = Blog.title

    return render_template('./makeup.html', blogs = blogs)

class Category(db.Model):
    id = db.Column(db.Integer, primary_key = True)
    categories = db.Column(db.String(150), unique = True)
    formss = db.relationship('Blog', backref = 'category', lazy=True) 

    def __repr__(self):
        return '<Category %r>' % self.id
    
    def __init__(self, categories):
        self.categories = categories
        
    

class Blog(db.Model):
    id = db.Column(db.Integer, primary_key = True)
    title = db.Column(db.String(150), unique = True)
    fileid = db.Column(db.String(150), unique = True)
    date = db.Column(db.String(150)) 
    content = db.Column(db.String(150))
    category_id = db.Column(db.Integer, db.ForeignKey('category.id'))
    

    def __repr__(self):
        return '<Blog %r>' % self.id
    
    def __init__(self, title, fileid, date, content, category):
        self.title = title
        self.fileid = fileid
        self.date = date
        self.content = content
        self.category = category

{% for date, img, title in blogs %}
  
                  
  <div class="fade1"><div class="fade"><img class="fadeimg" src="{{url_for('static', filename='uploads/')}}{{img}}"><button class="btn">View Post</button></div><p>{{date}}</p><h2>{{title}}</h2></div>
          
  {% endfor %}

Answer 1

我不确定发生了什么，id 是字符串还是整数似乎并不重要。像这样的东西应该有用。

@views.route("/makeup")
def makeup():
    blogs = Blog.query.filter(Blog.category_id == '1').all()
    
    # blogs is a list of model objects
    return render_template('./makeup.html', blogs = blogs)

这里我们遍历模型对象列表并使用模型填充模板。

{% for blog in blogs %}
  <div class="fade1"><div class="fade"><img class="fadeimg" src="{{url_for('static', filename='uploads/')}}{{ blog.fileid }}"><button class="btn">View Post</button></div><p>{{ blog.date }}</p><h2>{{ blog.title }}</h2></div>
{% endfor %}

无法查询和遍历数据库

Can't Query and iterate through database

python

flask

web

sqlalchemy