mirror of
https://github.com/encode/django-rest-framework.git
synced 2024-11-23 01:57:00 +03:00
252 lines
9.7 KiB
Python
252 lines
9.7 KiB
Python
from django.db.models import Model
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from django.db.models.query import QuerySet
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from django.db.models.fields.related import RelatedField
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import decimal
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import inspect
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import re
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class Resource(object):
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"""A Resource determines how an object maps to a serializable entity.
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Objects that a resource can act on include plain Python object instances, Django Models, and Django QuerySets."""
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# The model attribute refers to the Django Model which this Resource maps to.
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# (The Model's class, rather than an instance of the Model)
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model = None
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# By default the set of returned fields will be the set of:
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#
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# 0. All the fields on the model, excluding 'id'.
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# 1. All the properties on the model.
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# 2. The absolute_url of the model, if a get_absolute_url method exists for the model.
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#
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# If you wish to override this behaviour,
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# you should explicitly set the fields attribute on your class.
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fields = None
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@classmethod
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def object_to_serializable(self, data):
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"""A (horrible) munging of Piston's pre-serialization. Returns a dict"""
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def _any(thing, fields=()):
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"""
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Dispatch, all types are routed through here.
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"""
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ret = None
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if isinstance(thing, QuerySet):
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ret = _qs(thing, fields=fields)
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elif isinstance(thing, (tuple, list)):
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ret = _list(thing)
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elif isinstance(thing, dict):
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ret = _dict(thing)
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elif isinstance(thing, int):
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ret = thing
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elif isinstance(thing, bool):
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ret = thing
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elif isinstance(thing, type(None)):
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ret = thing
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elif isinstance(thing, decimal.Decimal):
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ret = str(thing)
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elif isinstance(thing, Model):
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ret = _model(thing, fields=fields)
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#elif isinstance(thing, HttpResponse): TRC
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# raise HttpStatusCode(thing)
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elif inspect.isfunction(thing):
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if not inspect.getargspec(thing)[0]:
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ret = _any(thing())
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elif hasattr(thing, '__rendertable__'):
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f = thing.__rendertable__
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if inspect.ismethod(f) and len(inspect.getargspec(f)[0]) == 1:
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ret = _any(f())
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else:
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ret = unicode(thing) # TRC TODO: Change this back!
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return ret
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def _fk(data, field):
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"""
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Foreign keys.
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"""
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return _any(getattr(data, field.name))
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def _related(data, fields=()):
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"""
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Foreign keys.
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"""
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return [ _model(m, fields) for m in data.iterator() ]
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def _m2m(data, field, fields=()):
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"""
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Many to many (re-route to `_model`.)
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"""
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return [ _model(m, fields) for m in getattr(data, field.name).iterator() ]
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def _method_fields(data, fields):
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if not data:
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return { }
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has = dir(data)
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ret = dict()
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for field in fields:
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if field in has:
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ret[field] = getattr(data, field)
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return ret
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def _model(data, fields=()):
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"""
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Models. Will respect the `fields` and/or
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`exclude` on the handler (see `typemapper`.)
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"""
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ret = { }
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#handler = self.in_typemapper(type(data), self.anonymous) # TRC
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handler = None # TRC
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get_absolute_url = False
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if fields:
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v = lambda f: getattr(data, f.attname)
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get_fields = set(fields)
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if 'absolute_url' in get_fields: # MOVED (TRC)
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get_absolute_url = True
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met_fields = _method_fields(handler, get_fields) # TRC
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for f in data._meta.local_fields:
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if f.serialize and not any([ p in met_fields for p in [ f.attname, f.name ]]):
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if not f.rel:
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if f.attname in get_fields:
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ret[f.attname] = _any(v(f))
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get_fields.remove(f.attname)
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else:
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if f.attname[:-3] in get_fields:
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ret[f.name] = _fk(data, f)
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get_fields.remove(f.name)
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for mf in data._meta.many_to_many:
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if mf.serialize and mf.attname not in met_fields:
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if mf.attname in get_fields:
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ret[mf.name] = _m2m(data, mf)
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get_fields.remove(mf.name)
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# try to get the remainder of fields
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for maybe_field in get_fields:
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if isinstance(maybe_field, (list, tuple)):
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model, fields = maybe_field
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inst = getattr(data, model, None)
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if inst:
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if hasattr(inst, 'all'):
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ret[model] = _related(inst, fields)
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elif callable(inst):
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if len(inspect.getargspec(inst)[0]) == 1:
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ret[model] = _any(inst(), fields)
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else:
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ret[model] = _model(inst, fields)
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elif maybe_field in met_fields:
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# Overriding normal field which has a "resource method"
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# so you can alter the contents of certain fields without
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# using different names.
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ret[maybe_field] = _any(met_fields[maybe_field](data))
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else:
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maybe = getattr(data, maybe_field, None)
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if maybe:
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if callable(maybe):
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if len(inspect.getargspec(maybe)[0]) == 1:
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ret[maybe_field] = _any(maybe())
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else:
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ret[maybe_field] = _any(maybe)
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else:
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pass # TRC
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#handler_f = getattr(handler or self.handler, maybe_field, None)
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#
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#if handler_f:
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# ret[maybe_field] = _any(handler_f(data))
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else:
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# Add absolute_url if it exists
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get_absolute_url = True
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# Add all the fields
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for f in data._meta.fields:
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if f.attname != 'id':
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ret[f.attname] = _any(getattr(data, f.attname))
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# Add all the propertiess
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klass = data.__class__
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for attr in dir(klass):
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if not attr.startswith('_') and not attr in ('pk','id') and isinstance(getattr(klass, attr, None), property):
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#if attr.endswith('_url') or attr.endswith('_uri'):
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# ret[attr] = self.make_absolute(_any(getattr(data, attr)))
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#else:
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ret[attr] = _any(getattr(data, attr))
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#fields = dir(data.__class__) + ret.keys()
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#add_ons = [k for k in dir(data) if k not in fields and not k.startswith('_')]
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#print add_ons
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###print dir(data.__class__)
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#from django.db.models import Model
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#model_fields = dir(Model)
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#for attr in dir(data):
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## #if attr.startswith('_'):
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## # continue
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# if (attr in fields) and not (attr in model_fields) and not attr.startswith('_'):
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# print attr, type(getattr(data, attr, None)), attr in fields, attr in model_fields
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#for k in add_ons:
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# ret[k] = _any(getattr(data, k))
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# TRC
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# resouce uri
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#if self.in_typemapper(type(data), self.anonymous):
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# handler = self.in_typemapper(type(data), self.anonymous)
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# if hasattr(handler, 'resource_uri'):
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# url_id, fields = handler.resource_uri()
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# ret['resource_uri'] = permalink( lambda: (url_id,
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# (getattr(data, f) for f in fields) ) )()
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# TRC
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#if hasattr(data, 'get_api_url') and 'resource_uri' not in ret:
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# try: ret['resource_uri'] = data.get_api_url()
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# except: pass
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# absolute uri
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if hasattr(data, 'get_absolute_url') and get_absolute_url:
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try: ret['absolute_url'] = data.get_absolute_url()
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except: pass
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#for key, val in ret.items():
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# if key.endswith('_url') or key.endswith('_uri'):
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# ret[key] = self.add_domain(val)
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return ret
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def _qs(data, fields=()):
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"""
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Querysets.
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"""
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return [ _any(v, fields) for v in data ]
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def _list(data):
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"""
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Lists.
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"""
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return [ _any(v) for v in data ]
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def _dict(data):
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"""
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Dictionaries.
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"""
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return dict([ (k, _any(v)) for k, v in data.iteritems() ])
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# Kickstart the seralizin'.
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return _any(data, self.fields)
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