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"""
test one to many relationships
"""
from elixir import *
from sqlalchemy import and_
from sqlalchemy.ext.orderinglist import ordering_list
def setup():
metadata.bind = 'sqlite:///'
class TestOneToMany(object):
def teardown(self):
cleanup_all(True)
def test_simple(self):
class A(Entity):
name = Field(String(60))
bs = OneToMany('B')
class B(Entity):
name = Field(String(60))
a = ManyToOne('A')
setup_all(True)
a1 = A(name='a1')
b1 = B(name='b1', a=a1)
# does it work before a commit? (does the backref work?)
assert b1 in a1.bs
session.commit()
session.clear()
b = B.query.one()
a = b.a
assert b in a.bs
def test_selfref(self):
class Person(Entity):
name = Field(String(30))
father = ManyToOne('Person', inverse='children')
children = OneToMany('Person', inverse='father')
setup_all(True)
grampa = Person(name="Abe")
homer = Person(name="Homer")
bart = Person(name="Bart")
lisa = Person(name="Lisa")
grampa.children.append(homer)
homer.children.append(bart)
lisa.father = homer
session.commit()
session.clear()
p = Person.get_by(name="Homer")
print "%s is %s's child." % (p.name, p.father.name)
print "His children are: %s." % (
" and ".join([c.name for c in p.children]))
assert p in p.father.children
assert p.father is Person.get_by(name="Abe")
assert p is Person.get_by(name="Lisa").father
def test_multiple_selfref(self):
# define a self-referential table with several relations
class TreeNode(Entity):
name = Field(String(50), required=True)
parent = ManyToOne('TreeNode')
children = OneToMany('TreeNode', inverse='parent')
root = ManyToOne('TreeNode')
def __str__(self):
return self._getstring(0)
def _getstring(self, level):
s = ' ' * level + \
"%s (%s,%s,%s, %d)" % (self.name, self.id, self.parent_id,
self.root_id, id(self)) + \
'\n'
s += ''.join([n._getstring(level+1) for n in self.children])
return s
setup_all(True)
node2 = TreeNode(name='node2')
node2.children.append(TreeNode(name='subnode1'))
node2.children.append(TreeNode(name='subnode2'))
node = TreeNode(name='rootnode')
node.children.append(TreeNode(name='node1'))
node.children.append(node2)
node.children.append(TreeNode(name='node3'))
session.commit()
session.clear()
root = TreeNode.get_by(name='rootnode')
print root
def test_viewonly(self):
class User(Entity):
two_blurbs = OneToMany('Blurb', primaryjoin=lambda:
and_(Blurb.user_id == User.id, Blurb.position < 2),
viewonly=True
)
blurbs = OneToMany('Blurb',
collection_class=ordering_list('position'),
order_by='position')
class Blurb(Entity):
user = ManyToOne('User')
position = Field(Integer)
blurb = Field(Unicode(255))
def __init__(self, blurb, **kwargs):
super(Blurb, self).__init__(blurb=blurb, **kwargs)
def __repr__(self):
return 'Blurb(%r, %r)' % (self.position, self.blurb)
setup_all(True)
user = User(blurbs=[Blurb(u'zero'), Blurb(u'one'), Blurb(u'two')])
session.commit()
session.clear()
user = User.get(1)
assert len(user.two_blurbs) == 2
assert user.two_blurbs[0].blurb == 'zero'
assert user.two_blurbs[1].blurb == 'one'
def test_filtered(self):
class User(Entity):
two_blurbs = OneToMany('Blurb', filter=lambda c: c.position < 2)
blurbs = OneToMany('Blurb',
collection_class=ordering_list('position'),
order_by='position')
class Blurb(Entity):
user = ManyToOne('User')
position = Field(Integer)
blurb = Field(Unicode(255))
def __init__(self, blurb, **kwargs):
super(Blurb, self).__init__(blurb=blurb, **kwargs)
def __repr__(self):
return 'Blurb(%r, %r)' % (self.position, self.blurb)
setup_all(True)
user = User(blurbs=[Blurb(u'zero'), Blurb(u'one'), Blurb(u'two')])
session.commit()
session.clear()
user = User.get(1)
assert len(user.two_blurbs) == 2
assert user.two_blurbs[0].blurb == 'zero'
assert user.two_blurbs[1].blurb == 'one'
def test_has_many_syntax(self):
class Person(Entity):
has_field('name', String(30))
has_many('pets', of_kind='Animal')
class Animal(Entity):
has_field('name', String(30))
belongs_to('owner', of_kind='Person')
setup_all(True)
santa = Person(name="Santa Claus")
rudolph = Animal(name="Rudolph", owner=santa)
session.commit()
session.clear()
santa = Person.get_by(name="Santa Claus")
assert Animal.get_by(name="Rudolph") in santa.pets
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