Hi,
I have created two tables with one to many relationship. Let's say parent
and child. i placed a foreign key in the child table referencing the parent.
I would like to add a new column ( Foreign key) in parent table which
references a subset of rows in child table depending on a child's table
column value:
let's say i want to reference the id of the eldest child of each parent (
is_first_born == True).
How can add i reference only one row with a foreign key in SQLAlchemy ?
class Parent(Base):
__tablename__ = 'parent'
id = Column(Integer, primary_key=True)
eldest_child_id = Column(Integer, ForeignKey('child.id'))
class Child(Base):
__tablename__ = 'child'
id = Column(Integer, primary_key=True)
is_first_born = Column(Boolean)
parent_id = Column(Integer, ForeignKey('parent.id'))
Thanks in advance.
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