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users, podcasts, episodes
assumptions
1. subscribe/unsubscribe podcast
2. subset of user has the ability to create podcast
3. podcast is a collection of episodes.
functional requirement
1. subscribe/unsubscribe podcast
2. content creator(special user) to create podcast and upload episodes
3. get the most recent N episodes of podcasts from user subscription, aggregated.
1. creator -> user, creator
2. user -> user
2. user table
3. subscriptions table
4. podcast and episodes
PODCAST {
NAME:
CREATOR:
DESCRIPTION:
[EPISODES_ID]
}
EPISODE {
ID:
DESCRIPTION:
}
API design
POST: CREATE PODCAST(PODCAST): 200
/CREATE:
GET_PODCAST
-> RETURN: PODCAST_NAME
/PODCAST_NAME -> RETURN: EPISODE_ID
POST: UPLOAD EPISODES(EPISODE, PODCAST_NAME): 200
GET_EPISODE_API
GET: ACCESS CONTENT(N): 200
array = [2,3..20,21]
K = TOTAL_NUMBER_OF_USERS -> 100,000,000
N = 20
K * N
/PODCAST_NAME/EPISODE_ID -> RETURN: CONTENT
lazy_loading:
Backend:
USER:
USER_ID(PK):
NAME,
// PRIVATE FIELDS
SUBSCRIPTIONS:
SUBSCRIPTION_ID(PK):
USER(SK),
PODCAST(SK)
u1, p1
u1, p2
u2, p1
CREATOR extends USER:
CREATOR_ID:
NAME,
PODCASTS = []
// private fields
PODCAST {
NAME(PK):
CREATOR:
DESCRIPTION:
[EPISODES_ID]
}
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