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Merged
jpahm merged 2 commits into from
Apr 9, 2025
Merged

Add events aggregation on upload #64

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Add events aggregation on upload
TyHil Apr 9, 2025
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TyHil Apr 9, 2025
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156 changes: 156 additions & 0 deletions uploader/uploader.go
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,7 @@ func Upload(inDir string, replace bool) {
}
}

buildEvents(client, ctx)
}

// Generic upload function to upload parsed JSON data to the Mongo database
Expand Down Expand Up @@ -167,3 +168,158 @@ func UploadData[T any](client *mongo.Client, ctx context.Context, fptr *os.File,

defer fptr.Close()
}

// MongoDB aggregation run only when sections changes, instead of as a view where it's run for each query
func buildEvents(client *mongo.Client, ctx context.Context) {
sections := getCollection(client, "sections")

pipeline := mongo.Pipeline{
//separate each meeting
{{Key: "$unwind", Value: "$meetings"}},
//remove bad data
{{Key: "$match", Value: bson.D{
{Key: "meetings.location.building", Value: bson.D{{Key: "$ne", Value: "No"}}},
}}},
//remove time from meeting start date
{{Key: "$addFields", Value: bson.D{
{Key: "meetings.start_date", Value: bson.D{
{Key: "$dateTrunc", Value: bson.D{
{Key: "date", Value: "$meetings.start_date"},
{Key: "unit", Value: "day"},
}},
}},
}}},
//add a field thats a list of all days the class occurs
//by generating all days in semester and removing those that don't match MW for example
{{Key: "$addFields", Value: bson.D{
{Key: "meeting_dates", Value: bson.D{
{Key: "$filter", Value: bson.D{
{Key: "input", Value: bson.D{
{Key: "$map", Value: bson.D{
{Key: "input", Value: bson.D{
{Key: "$range", Value: bson.A{
0,
bson.D{{Key: "$dateDiff", Value: bson.D{
{Key: "startDate", Value: bson.D{{Key: "$toDate", Value: "$meetings.start_date"}}},
{Key: "endDate", Value: bson.D{{Key: "$toDate", Value: "$meetings.end_date"}}},
{Key: "unit", Value: "day"},
}}},
1,
}},
}},
{Key: "as", Value: "offset"},
{Key: "in", Value: bson.D{
{Key: "$dateAdd", Value: bson.D{
{Key: "startDate", Value: bson.D{{Key: "$toDate", Value: "$meetings.start_date"}}},
{Key: "unit", Value: "day"},
{Key: "amount", Value: "$$offset"},
}},
}},
}},
}},
{Key: "as", Value: "date"},
{Key: "cond", Value: bson.D{
{Key: "$in", Value: bson.A{
bson.D{{Key: "$dayOfWeek", Value: "$$date"}},
bson.D{{Key: "$map", Value: bson.D{
{Key: "input", Value: "$meetings.meeting_days"},
{Key: "as", Value: "day"},
{Key: "in", Value: bson.D{
{Key: "$switch", Value: bson.D{
{Key: "branches", Value: bson.A{
bson.D{{Key: "case", Value: bson.D{{Key: "$eq", Value: bson.A{"$$day", "Sunday"}}}}, {Key: "then", Value: 1}},
bson.D{{Key: "case", Value: bson.D{{Key: "$eq", Value: bson.A{"$$day", "Monday"}}}}, {Key: "then", Value: 2}},
bson.D{{Key: "case", Value: bson.D{{Key: "$eq", Value: bson.A{"$$day", "Tuesday"}}}}, {Key: "then", Value: 3}},
bson.D{{Key: "case", Value: bson.D{{Key: "$eq", Value: bson.A{"$$day", "Wednesday"}}}}, {Key: "then", Value: 4}},
bson.D{{Key: "case", Value: bson.D{{Key: "$eq", Value: bson.A{"$$day", "Thursday"}}}}, {Key: "then", Value: 5}},
bson.D{{Key: "case", Value: bson.D{{Key: "$eq", Value: bson.A{"$$day", "Friday"}}}}, {Key: "then", Value: 6}},
bson.D{{Key: "case", Value: bson.D{{Key: "$eq", Value: bson.A{"$$day", "Saturday"}}}}, {Key: "then", Value: 7}},
}},
{Key: "default", Value: nil},
}},
}},
}}},
}},
}},
}},
}},
}}},
//separate for each meeting data
{{Key: "$unwind", Value: "$meeting_dates"}},
//remove data before today
{{Key: "$match", Value: bson.D{
{Key: "$expr", Value: bson.D{
{Key: "$gte", Value: bson.A{
"$meeting_dates",
bson.D{{Key: "$dateSubtract", Value: bson.D{
{Key: "startDate", Value: bson.D{{Key: "$dateTrunc", Value: bson.D{
{Key: "date", Value: "$$NOW"},
{Key: "unit", Value: "day"},
}}}},
{Key: "unit", Value: "day"},
{Key: "amount", Value: 7},
}}},
}},
}},
}}},
//group into building > room hierarchy format
{{Key: "$group", Value: bson.D{
{Key: "_id", Value: bson.D{
{Key: "date", Value: "$meeting_dates"},
{Key: "building", Value: "$meetings.location.building"},
{Key: "room", Value: "$meetings.location.room"},
}},
{Key: "events", Value: bson.D{
{Key: "$push", Value: bson.D{
{Key: "section", Value: "$_id"},
{Key: "start_time", Value: "$meetings.start_time"},
{Key: "end_time", Value: "$meetings.end_time"},
}},
}},
}}},
{{Key: "$group", Value: bson.D{
{Key: "_id", Value: bson.D{
{Key: "date", Value: "$_id.date"},
{Key: "building", Value: "$_id.building"},
}},
{Key: "rooms", Value: bson.D{
{Key: "$push", Value: bson.D{
{Key: "room", Value: "$_id.room"},
{Key: "events", Value: "$events"},
}},
}},
}}},
{{Key: "$group", Value: bson.D{
{Key: "_id", Value: bson.D{
{Key: "date", Value: "$_id.date"},
}},
{Key: "buildings", Value: bson.D{
{Key: "$push", Value: bson.D{
{Key: "building", Value: "$_id.building"},
{Key: "rooms", Value: "$rooms"},
}},
}},
}}},
//format date
{{Key: "$project", Value: bson.D{
{Key: "_id", Value: 0},
{Key: "date", Value: bson.D{
{Key: "$dateToString", Value: bson.D{
{Key: "format", Value: "%Y-%m-%d"},
{Key: "date", Value: "$_id.date"},
}},
}},
{Key: "buildings", Value: 1},
}}},
//set as events collection
{{Key: "$out", Value: "events"}},
}

cursor, err := sections.Aggregate(ctx, pipeline)
if err != nil {
log.Panic(err)
}
defer cursor.Close(ctx)

log.Println("Done aggregating events!")
}