In this talk David will summarize business and technical use cases and introduce Kaiso. He will give a basic overview of how to use it, along with some examples of how one might use it to model complex class hierarchies. This will include some interactive code demonstrations. David will explore the main design goals of the project, the current state of the project, and take a look at what’s ahead on Kaiso’s roadmap.

1. Kaiso
-­‐
an
object
persistence
framework
for
Python
and
Neo4j
David
Szo>en
onefinestay
!
!
!
@szo;en
github.com/davidszo;en
1
©
Lifealike
Limited,
2013.

2. Overview
• About
onefinestay
• We
care
about
homes
• How
we
track
our
homes
using
Neo4j
• Kaiso
demo
2
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Lifealike
Limited,
2013.

3. onefinestay
-­‐
the
unhotel
3
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Limited,
2013.

4. onefinestay
-­‐
the
unhotel
• Guests
live
like
a
local
– but
with
services
and
ameniNes
of
a
hotel
!
• Members
with
disNncNve
homes
earn
hassle-­‐free
income
!
• From
just
a
handful
of
homes
in
2010
to
over
1000
homes
in
4
ciNes
in
2013
4
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Lifealike
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2013.

5. How
do
we
do
it?
• Provision:
Home
Unhotel
– Clean
– Pack
away
certain
items
• Make
wardrobe
space
• Deprovision:
Unhotel
Home
– Clean
– Put
everything
back
5
©
Lifealike
Limited,
2013.

6. We
care
about
our
homes.
A
lot.
• Every
home
is
different
• We
require
inNmate
knowledge
!
• For
guests:
“I
can’t
walk
up
stairs”,
“Where
is
the
iron?”
• For
members:
“Please
put
my
fragile
vase
away
before
the
guests
arrive”
• For
us:
“How
much
bed
linen
do
I
need
to
take
to
this
home
for
this
booking?”
6
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Lifealike
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2013.

7. Previous
system
• Custom
storage
soluNon
• Dates
back
to
when
we
were
much
smaller
• Problems:
– Siloed
– Hard
to
query
denormalised
copies
7
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2013.

8. New
system
• Want
to
model
our
homes
– both
layout
and
contents
!
• Need
flexibility
– Our
needs
are
likely
to
grow
and
change
!
• Track
not
only
objects,
but
their
classes
– Ideally
treat
the
taxonomy
itself
as
data
8
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Lifealike
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2013.

9. Enter
Neo4j
• Handle
complex
data
structures
!
• Ensure
extensibility
for
future
needs
!
• Easy
to
create
powerful
queries
!
• Makes
for
a
nice
conceptual
model
of
our
data
9
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2013.

10. Flexibility
requirements
• We
want
to
associate
informaNon
with
classes
as
well
as
objects
– This
dishwasher
is
of
make
Electropool
– (All)
appliances
need
PAT
tesNng
!
• Unlike
convenNonal
object
mappers,
the
taxonomy/class
hierarchy
needs
to
be
editable
by
users,
and
so
should
be
part
of
the
data
10
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2013.

11. Kaiso
-­‐
an
object
persistence
framework
# (import some stuff)!
!
class Animal(Entity):!
id = Uuid(unique=True)!
name = String()!
friend_of = Outgoing(FriendOf)!
!
class Carnivore(Animal): pass!
class Herbivore(Animal): pass!
!
class Penguin(Herbivore):!
favourite_ice_cream = String()!
!
class Lion(Carnivore):!
n_siblings = Integer()!
11
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2013.

12. Kaiso:
Create
some
instances
# import types, connect to db!
!
manager = Manager("http://localhost:7474/db/data/")!
!
manager.save(Lion)!
manager.save(Penguin)!
!
# create some instances!
fred = Penguin(name="Fred")!
tom = Lion(name="Tom")!
!
relation = FriendOf(fred, tom)!
!
manager.save(fred)!
manager.save(tom)!
manager.save(relation)
12
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2013.

13. Instances
are
saved
in
the
graph...
FRIENDOF
[6]
Penguin:
Fred
13
[7]
Lion:
Tom
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2013.

14. ...
and
so
is
the
class
hierarchy
[1]
Type:
Animal
ISA
ISA
[4]
Type:
Herbivore
[2]
Type:
Carnivore
ISA
ISA
[3]
Type:
Lion
[5]
Type:
Penguin
INSTANCEOF
INSTANCEOF
FRIENDOF
[6]
Penguin:
Fred
14
[7]
Lion:
Tom
©
Lifealike
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2013.

15. Kaiso:
Queries
based
on
the
type
hierarchy
START!
Herbivore=node:persistabletype(id="Herbivore"),!
Carnivore=node:persistabletype(id="Carnivore")!
!
MATCH!
Carnivore <-[:ISA*]-()<-[:INSTANCEOF]-(carnivore),!
Herbivore <-[:ISA*]-()<-[:INSTANCEOF]-(herbivore),!
!
!
(herbivore)-[:FRIENDOF]->(carnivore)!
RETURN!
"The herbivore",!
herbivore.name,!
“is a friend of the carnivore",!
carnivore.name;!
!
=> +--------------------------------------------------------------------+!
=> | "The herbivore" | "Fred" | "is a friend of the carnivore" | “Tom" |
=> +--------------------------------------------------------------------+
15
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Lifealike
Limited,
2013.

16. Thank
you
QuesNons?
!
!
Kaiso
github.com/onefinestay/kaiso
!
github.com/davidszo;en
@davidszo;en
16
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Lifealike
Limited,
2013.