Flask中定义模型类的情况分别有哪些
Flask中定义模型类的情况分别有哪些，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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from datetime import datetime
from werkzeug.security import generate_password_hash, check_password_hash
from utils import constants
from . import db
class BaseModel(object):
"""模型基类，为每个模型补充创建时间与更新时间"""
create_time = db.Column(db.DateTime, default=datetime.now) # 记录的创建时间
update_time = db.Column(db.DateTime, default=datetime.now, onupdate=datetime.now) # 记录的更新时间
# 用户收藏表，建立用户与其收藏新闻多对多的关系
tb_user_collection = db.Table(
"info_user_collection",
db.Column("user_id", db.Integer, db.ForeignKey("info_user.id"), primary_key=True), # 新闻编号
db.Column("news_id", db.Integer, db.ForeignKey("info_news.id"), primary_key=True), # 分类编号
db.Column("create_time", db.DateTime, default=datetime.now) # 收藏创建时间
)
tb_user_follows = db.Table(
"info_user_fans",
db.Column('follower_id', db.Integer, db.ForeignKey('info_user.id'), primary_key=True), # 粉丝id
db.Column('followed_id', db.Integer, db.ForeignKey('info_user.id'), primary_key=True) # 被关注人的id
)
class User(BaseModel, db.Model):
"""用户"""
__tablename__ = "info_user"
id = db.Column(db.Integer, primary_key=True) # 用户编号
nick_name = db.Column(db.String(32), unique=True, nullable=False) # 用户昵称
password_hash = db.Column(db.String(128), nullable=False) # 加密的密码
mobile = db.Column(db.String(11), unique=True, nullable=False) # 手机号
avatar_url = db.Column(db.String(256)) # 用户头像路径
last_login = db.Column(db.DateTime, default=datetime.now) # 最后一次登录时间
is_admin = db.Column(db.Boolean, default=False)
signature = db.Column(db.String(512)) # 用户签名
gender = db.Column( # 订单的状态
db.Enum(
"MAN", # 男
"WOMAN" # 女
),
default="MAN")
# 当前用户收藏的所有新闻
collection_news = db.relationship("News", secondary=tb_user_collection, lazy="dynamic") # 用户收藏的新闻
# 用户所有的粉丝，添加了反向引用followed，代表用户都关注了哪些人
followers = db.relationship('User',
secondary=tb_user_follows,
primaryjoin=id == tb_user_follows.c.followed_id,
secondaryjoin=id == tb_user_follows.c.follower_id,
backref=db.backref('followed', lazy='dynamic'),
lazy='dynamic')
# 当前用户所发布的新闻
news_list = db.relationship('News', backref='user', lazy='dynamic')
@property
def password(self):
raise AttributeError("当前属性不可读")
@password.setter
def password(self, value):
self.password_hash = generate_password_hash(value)
def check_passowrd(self, password):
return check_password_hash(self.password_hash, password)
def to_dict(self):
resp_dict = {
"id": self.id,
"nick_name": self.nick_name,
"avatar_url": constants.QINIU_DOMIN_PREFIX + self.avatar_url if self.avatar_url else "",
"mobile": self.mobile,
"gender": self.gender if self.gender else "MAN",
"signature": self.signature if self.signature else "",
"followers_count": self.followers.count(),
"news_count": self.news_list.count()
}
return resp_dict
def to_admin_dict(self):
resp_dict = {
"id": self.id,
"nick_name": self.nick_name,
"mobile": self.mobile,
"register": self.create_time.strftime("%Y-%m-%d %H:%M:%S"),
"last_login": self.last_login.strftime("%Y-%m-%d %H:%M:%S"),
}
return resp_dict
class News(BaseModel, db.Model):
"""新闻"""
__tablename__ = "info_news"
id = db.Column(db.Integer, primary_key=True) # 新闻编号
title = db.Column(db.String(256), nullable=False) # 新闻标题
source = db.Column(db.String(64), nullable=False) # 新闻来源
digest = db.Column(db.String(512), nullable=False) # 新闻摘要
content = db.Column(db.Text, nullable=False) # 新闻内容
clicks = db.Column(db.Integer, default=0) # 浏览量
index_image_url = db.Column(db.String(256)) # 新闻列表图片路径
category_id = db.Column(db.Integer, db.ForeignKey("info_category.id"))
user_id = db.Column(db.Integer, db.ForeignKey("info_user.id")) # 当前新闻的作者id
status = db.Column(db.Integer, default=0) # 当前新闻状态 如果为0代表审核通过，1代表审核中，-1代表审核不通过
reason = db.Column(db.String(256)) # 未通过原因，status = -1 的时候使用
# 当前新闻的所有评论
comments = db.relationship("Comment", lazy="dynamic")
def to_review_dict(self):
resp_dict = {
"id": self.id,
"title": self.title,
"create_time": self.create_time.strftime("%Y-%m-%d %H:%M:%S"),
"status": self.status,
"reason": self.reason if self.reason else ""
}
return resp_dict
def to_basic_dict(self):
resp_dict = {
"id": self.id,
"title": self.title,
"source": self.source,
"digest": self.digest,
"create_time": self.create_time.strftime("%Y-%m-%d %H:%M:%S"),
"index_image_url": self.index_image_url,
"clicks": self.clicks,
}
return resp_dict
def to_dict(self):
resp_dict = {
"id": self.id,
"title": self.title,
"source": self.source,
"digest": self.digest,
"create_time": self.create_time.strftime("%Y-%m-%d %H:%M:%S"),
"content": self.content,
"comments_count": self.comments.count(),
"clicks": self.clicks,
"category": self.category.to_dict(),
"index_image_url": self.index_image_url,
"author": self.user.to_dict() if self.user else None
}
return resp_dict
class Comment(BaseModel, db.Model):
"""评论"""
__tablename__ = "info_comment"
id = db.Column(db.Integer, primary_key=True) # 评论编号
user_id = db.Column(db.Integer, db.ForeignKey("info_user.id"), nullable=False) # 用户id
news_id = db.Column(db.Integer, db.ForeignKey("info_news.id"), nullable=False) # 新闻id
content = db.Column(db.Text, nullable=False) # 评论内容
parent_id = db.Column(db.Integer, db.ForeignKey("info_comment.id")) # 父评论id
parent = db.relationship("Comment", remote_side=[id]) # 自关联
like_count = db.Column(db.Integer, default=0) # 点赞条数
def to_dict(self):
resp_dict = {
"id": self.id,
"create_time": self.create_time.strftime("%Y-%m-%d %H:%M:%S"),
"content": self.content,
"parent": self.parent.to_dict() if self.parent else None,
"user": User.query.get(self.user_id).to_dict(),
"news_id": self.news_id,
"like_count": self.like_count
}
return resp_dict
class CommentLike(BaseModel, db.Model):
"""评论点赞"""
__tablename__ = "info_comment_like"
comment_id = db.Column("comment_id", db.Integer, db.ForeignKey("info_comment.id"), primary_key=True) # 评论编号
user_id = db.Column("user_id", db.Integer, db.ForeignKey("info_user.id"), primary_key=True) # 用户编号
class Category(BaseModel, db.Model):
"""新闻分类"""
__tablename__ = "info_category"
id = db.Column(db.Integer, primary_key=True) # 分类编号
name = db.Column(db.String(64), nullable=False) # 分类名
news_list = db.relationship('News', backref='category', lazy='dynamic')
def to_dict(self):
resp_dict = {
"id": self.id,
"name": self.name
}
return resp_dict看完上述内容，你们掌握Flask中定义模型类的情况分别有哪些的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注创新互联行业资讯频道，感谢各位的阅读！
新闻标题：Flask中定义模型类的情况分别有哪些
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