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b1a97b0d69
Because ModelList implements `__add__` we can do the following: ```python ImmediateJobs() + ScheduledJobs() ImmediateJobs() + [] ``` Both of these call the `__add__` method of `ImmediateJobs`. What we can’t do is this: ```python [] + ScheduledJobs() ``` That tries to call the `__add__` method of list, which doesn’t know what to do with an instance of `ModelList`. The Pythonic way to deal with this is to implement `__radd__` (right add) which is invoked when our instance is on the right hand side of the addition operator.
84 lines
2.0 KiB
Python
84 lines
2.0 KiB
Python
from abc import ABC, abstractmethod
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from collections.abc import Sequence
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from flask import abort
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class JSONModel():
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ALLOWED_PROPERTIES = set()
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def __init__(self, _dict):
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# in the case of a bad request _dict may be `None`
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self._dict = _dict or {}
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def __bool__(self):
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return self._dict != {}
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def __hash__(self):
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return hash(self.id)
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def __eq__(self, other):
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return self.id == other.id
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def __getattribute__(self, attr):
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try:
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return super().__getattribute__(attr)
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except AttributeError as e:
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# Re-raise any `AttributeError`s that are not directly on
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# this object because they indicate an underlying exception
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# that we don’t want to swallow
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if str(e) != "'{}' object has no attribute '{}'".format(
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self.__class__.__name__, attr
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):
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raise e
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if attr in super().__getattribute__('ALLOWED_PROPERTIES'):
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return super().__getattribute__('_dict')[attr]
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raise AttributeError((
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"'{}' object has no attribute '{}' and '{}' is not a field "
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"in the underlying JSON"
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).format(
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self.__class__.__name__, attr, attr
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))
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def _get_by_id(self, things, id):
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try:
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return next(thing for thing in things if thing['id'] == str(id))
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except StopIteration:
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abort(404)
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class ModelList(ABC, Sequence):
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@property
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@abstractmethod
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def client_method(self):
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pass
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@property
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@abstractmethod
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def model(self):
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pass
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def __init__(self, *args):
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self.items = self.client_method(*args)
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def __getitem__(self, index):
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return self.model(self.items[index])
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def __len__(self):
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return len(self.items)
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def __add__(self, other):
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return list(self) + list(other)
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def __radd__(self, other):
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return list(other) + list(self)
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class InviteTokenError(Exception):
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pass
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