Remy Moll
4e07c10969
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49 lines
1.6 KiB
Python
49 lines
1.6 KiB
Python
"""Definition of the Trip class."""
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from uuid import uuid4, UUID
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from pydantic import BaseModel, Field
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from pymemcache.client.base import Client
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from .linked_landmarks import LinkedLandmarks
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class Trip(BaseModel):
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""""
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A Trip represents the final guided tour that can be passed to frontend.
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Attributes:
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uuid: unique identifier for this particular trip.
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total_time: duration of the trip (in minutes).
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first_landmark_uuid: unique identifier of the first Landmark to visit.
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Methods:
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from_linked_landmarks: create a Trip from LinkedLandmarks object.
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"""
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uuid: UUID = Field(default_factory=uuid4)
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total_time: int
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first_landmark_uuid: UUID
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@classmethod
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def from_linked_landmarks(cls, landmarks: LinkedLandmarks, cache_client: Client) -> "Trip":
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"""
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Initialize a new Trip object and ensure it is stored in the cache.
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"""
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trip = Trip(
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total_time = landmarks.total_time,
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first_landmark_uuid = landmarks[0].uuid
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)
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# Store the trip in the cache
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cache_client.set(f"trip_{trip.uuid}", trip)
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# Make sure to await the result (noreply=False).
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# Otherwise the cache might not be inplace when the trip is actually requested.
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cache_client.set_many({f"landmark_{landmark.uuid}": landmark for landmark in landmarks},
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expire=3600, noreply=False)
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# is equivalent to:
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# for landmark in landmarks:
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# cache_client.set(f"landmark_{landmark.uuid}", landmark, expire=3600)
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return trip
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