QuerySelectField

###FORM
def landscape_choices():
    return LandscapeFormOpt.query

class ServerForm(NoCsrfForm):
    landscape_name = QuerySelectField('Landscape nnname', query_factory=landscape_choices, get_label='landscape_name')
  
class LTestForm(Form):
    server = FieldList(FormField(ServerForm, default=lambda: Server()))
    submit = SubmitField('Submit')
  
  
###MODEL
class Project(db.Model):
    __tablename__ = 'projects'
    id = db.Column(db.Integer, primary_key=Tr
    server = db.relationship('Server')
    
    def __repr__(self):
        return '<Project %r>' % self.name
    
class Server(db.Model):
    __tablename__ = 'server'
    id = db.Column(db.Integer, primary_key=True)
    project_id = db.Column(db.Integer, db.ForeignKey('projects.id'))
    landscape_name = db.Column(db.Integer, db.ForeignKey('landscape_form_opt.id'))
  
class LandscapeFormOpt(db.Model):
    __tablename__ = 'landscape_form_opt'
    id = db.Column(db.Integer, primary_key=True)
    landscape_name = db.Column(db.Text())
    server_relationship = db.relationship('Server', backref='role', lazy='dynamic')
    
###VIEW
@main.route('/edit_pursuit/ope-'+'<project_ope>', methods=['GET', 'POST'])
@login_required
def edit_pursuit(project_ope):
    form_landscape = LTestForm(obj=project)
    
form_landscape.populate_obj(project)
db.session.add(project)
db.session.commit()

sqlalchemy.exc.ProgrammingError: (psycopg2.ProgrammingError) can't adapt type 'LandscapeFormOpt' [SQL: 'UPDATE server SET landscape_name=%(landscape_name)s, storage=%(storage)s WHERE server.id = %(server_id)s'] [parameters: {'storage': '3', 'landscape_name': app.models.LandscapeFormOpt object at 0x107c96780, 'server_id': 9}]