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POflask-sqlalchemy insert is not mapped
 

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    <p>I've had a ton of trouble properly implementing many to many relationships in flask-sqlalchemy. It started with duplicate tags and now, many days later is a mapping problem. Fair warning, my code was much prettier before these issues crept up. I also added a addproduct.py file to speed up testing. So here it is.</p> <p>models.py</p> <pre><code>1 from app import app, db 2 3 product_tags = db.Table('association', 4 db.Column('product_id', db.Integer, db.ForeignKey('product.id')), 5 db.Column('tag_name', db.Integer, db.ForeignKey('tag.name')) 6 ) 7 8 class Product(db.Model): 9 id = db.Column(db.Integer, primary_key=True) 10 title = db.Column(db.String(128)) 11 description = db.Column(db.Text) 12 image = db.Column(db.String(64)) 13 link = db.Column(db.String(256)) 14 price = db.Column(db.Float()) 15 timestamp = db.Column(db.DateTime) 16 expiration = db.Column(db.String(6)) 17 tags = db.relationship('Tag', secondary=product_tags, 18 backref=db.backref('product', lazy='dynamic')) 19 20 def __init__(self, title, description, image, link, price, timestamp, expiration, tags): 21 self.title = title 22 self.description = description 23 self.image = image 24 self.link = link 25 self.price = price 26 self.timestamp = timestamp 27 self.expiration = expiration 28 self.tags = tags 29 print self.title 30 31 def __repr__(self): 32 return '&lt;Title %r, Description %r, Image %r, Link %r, Price %r, Timestamp %r, Expires %r, Tags %r&gt;' % (self.title, self.description, self.image, sel 33 34 class Tag(db.Model): 35 name = db.Column(db.String(32), primary_key=True) 36 37 def __init__(self, name): 38 self.name = name 39 40 def __repr__(self): 41 return '&lt;Tag %r&gt;' % self.name </code></pre> <p>addproduct.py</p> <pre><code>1 from app import db 2 from app.models import Product, Tag, product_tags 3 from datetime import datetime 4 5 imagefolder = 'static/img/' 6 7 title = 'product' 8 description = 'description' 9 image = 'image.jpg' 10 link = 'http://link.com' 11 price = 2000.00 12 expiration = '' 13 tags = ['tag1','tag2'] 14 15 newtags = [] 16 17 def create_product(title, description, image, link, price, expiration, tags): 18 image = imagefolder + image 19 tag_assoc = [] 20 for tag in tags: 21 tagcheck = Tag.query.filter_by(name=tag).first() 22 if tagcheck == None: 23 tag_assoc.append(Tag(tag)) 24 else: 25 newtags.append(tag) 26 27 product = Product(title, description, image, link, price, datetime.utcnow(), expiration, tag_assoc) 28 create_assoc(newtags) 29 return product 30 31 def create_assoc(newtags): 32 title_search = Product.query.filter_by(title=title).first() 33 for tag in newtags: 34 assoc = product_tags.insert().values(product_id=title_search.id, tag_name=tag) 35 db.session.add(assoc) 36 db.session.commit() 37 38 if __name__ == '__main__': 39 product = create_product(title, description, image, link, price, expiration, tags) 40 db.session.add(product) 41 db.session.commit() 42 create_assoc(newtags) </code></pre> <p>The error message I get is:</p> <pre><code>11:11 ~/shop $ python addproduct.py product Traceback (most recent call last): File "addproduct.py", line 39, in &lt;module&gt; product = create_product(title, description, image, link, price, expiration, tags) File "addproduct.py", line 28, in create_product create_assoc(newtags) File "addproduct.py", line 35, in create_assoc db.session.add(assoc) File "/home/username/.local/lib/python2.7/site-packages/sqlalchemy/orm/scoping.py", line 114, in do return getattr(self.registry(), name)(*args, **kwargs) File "/home/username/.local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1358, in add raise exc.UnmappedInstanceError(instance) sqlalchemy.orm.exc.UnmappedInstanceError: Class 'sqlalchemy.sql.expression.Insert' is not mapped </code></pre> <p>This is my first webapp not directly from a tutorial, and I am totally lost. Please help!</p>
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