beavyHQ/beavy

Beavy – the modular community building framework

Benjamin Kampmann

@gnunicorn

well. builtin … by me.

Ethan Miller

@ezmiller

makes sense

nice

Benjamin Kampmann

@gnunicorn

so that list by default is just list of hashes of {type, id} unless you add an extra payload to it in attributes (if I recall correctly)

Ethan Miller

@ezmiller

query.paginate() is a function you wrote?

Benjamin Kampmann

@gnunicorn

oh, no that one isn’t.

I had to adapt it a little bit, but that was stolen from somewhere

Ethan Miller

@ezmiller

so it’s not part of any library but you imported it somehow on its own?

Benjamin Kampmann

@gnunicorn

what is written into each of those hashes is determined by the appropriate Marshaller for that specific object-type

I think I got it from here – http://flask.pocoo.org/snippets/44/

or maybe not. who knows...

Ethan Miller

@ezmiller

oh okay, i was thinking of looking at that page to try to understand what might be goingon.

Benjamin Kampmann

@gnunicorn

ther we go – http://flask-sqlalchemy.pocoo.org/2.1/api/#utilities

that’s the one.

Ethan Miller

@ezmiller

okay, i will look at that, but back to the json=1 result.

Benjamin Kampmann

@gnunicorn

yes. so.

common/paging_schema.py is invoked

a schema is the marshmallow description to build the json

which wraps around the schemas/object schema.

Ethan Miller

@ezmiller

okay

Benjamin Kampmann

@gnunicorn

there is a lot of magic in there and I won’t go there – with meta classes and stuff. – the important part is, that in order to have a some data dumped for an object you have, you need to let the marshmallow-er know which schema to use

we have a morphing_schema for that.

Ethan Miller

@ezmiller

just looking at that

one sec

polymorphic_identity is this key defining what kind of object is in the row in the objects table or whatever it’s called right?

Benjamin Kampmann

@gnunicorn

to register the schema you want to have the let the ObjectField registry know about thaat.

exactly.

Ethan Miller

@ezmiller

it maps to “type” later?

Benjamin Kampmann

@gnunicorn

so. as an example, take a look at beavy_modules/private_message/schemas.py

Ethan Miller

@ezmiller

okay one sec

Benjamin Kampmann

@gnunicorn

there is a schema that explains the private message – and then at the end registers that with the morphing-schema. essentially saying: if you find a type=private_message use this schema.

you need to do the same for the object you have

it maps to “type” later?

Ethan Miller

@ezmiller

ahah

Benjamin Kampmann

@gnunicorn

Unfortunately that is kinda hard-coded inside marshmallow and not easy to get into that. so your Schema must have a class Meta, which must have a type property set properly at the moment. look at the private message as an example again.

Ethan Miller

@ezmiller

The ObjectRegistry is hard-coded?

Benjamin Kampmann

@gnunicorn

if you did both of those, and restart the server, the resulting json should contain the data you want it to dump

Ethan Miller

@ezmiller

sorry ObjectField.registry...

Benjamin Kampmann

@gnunicorn

ObjectField is just a field containing any morphing object type. the registry is just a dictionary on that class (so a singleton inside this running process) which allows it to look up which schema to actually use when it encouters a specific type.

see beavy/schemas/object ->

class ObjectField(MorphingSchema):
    FALLBACK = BaseObject
    registry = {}

Ethan Miller

@ezmiller

Just trying to parse all this. Hold on.

Benjamin Kampmann

@gnunicorn

(the travis errors are the known “enter passphrase”- problem. need to fix that one!)

sure.

gnunicorn @ligthyear will go to bed soon, but I can wait a bit ;)

Ethan Miller

@ezmiller

didn’t we have a fix for that?

Benjamin Kampmann

@gnunicorn

did we?

Ethan Miller

@ezmiller

yeah

Benjamin Kampmann

@gnunicorn

I only remember fixing it for tech talks, but not yet on master.

Ethan Miller

@ezmiller

oh no

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