我在Flask中使用多个数据库（<div class="col-sm-6 masonry-item">
<a href="<?php echo Url::to(['site/roompage']); ?>" class="product_item text-center">
<span class="product_photo bordered_wht_border">
<?php
foreach (explode(';',rtrim($row['images'],';'),1) as $key_img => $value_img)
{
?>
<?php echo Html::img('@backend/web'.'/'.$value_img);?>
<?php
}
?>
</span>
<span class="product_title"><?php echo $row['room_type']; ?></span>
<span class="product_price">Rs.<?php echo $row['rate']; ?></span>
</a>
</div>
<?php endforeach; ?>
和db_1）绑定：
db_2
config.py但是当我为现有数据库定义模型时（表SQLALCHEMY_DATABASE_URI = 'db_1-postgres-url'
SQLALCHEMY_BINDS = {
'historic': 'db_2-postgres-url',
}
和db_1.mytable）
db_2.mytable失败并出现以下错误：
class Model1(db.Model):
__tablename__ = 'mytable'
class Model2(db.Model):
__tablename__ = 'mytable'
__bind_key__ = 'historic'
我尝试使用不同的基础词来定义它们：一个使用InvalidRequestError: Table 'mytable' is already defined for this MetaData instance. Specify 'extend_existing=True' to redefine options and columns on an existing Table object.
File "manage.py", line 9, in <module>
File "myproject/run.py", line 56, in create_app
File "/myproject/views.py", line 9, in <module>
File "/myproject/historic_models.py", line 59, in <module>
File "flask_sqlalchemy/__init__.py", line 609, in __init__
File "sqlalchemy/ext/declarative/api.py", line 55, in __init__
File "sqlalchemy/ext/declarative/base.py", line 88, in _as_declarative
File "sqlalchemy/ext/declarative/base.py", line 103, in setup_mapping
File "sqlalchemy/ext/declarative/base.py", line 131, in __init__
File "sqlalchemy/ext/declarative/base.py", line 394, in _setup_table
File "sqlalchemy/sql/schema.py", line 398, in __new__
，另一个使用flask-sqlalchemy：
declarative_base在这种情况下，我可以毫无错误地运行我的应用程序，但是当我为class Model1(db.Model):
__tablename__ = 'mytable'
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import create_engine
Base = declarative_base()
engine = create_engine(SQLALCHEMY_BINDS.get('historic'))
Base.metadata.bind = engine
class Model2(Base):
__tablename__ = 'mytable'
__bind_key__ = 'historic'
编写查询时，它仍然会查询Model2而不是db_1.mytable。
我尝试了来自this pull request的解决方案，但它确实有效，但由于它不在Flask-SQLAlchemy中，还有办法完成同样的事情吗？