56 lines
1.7 KiB
Go
56 lines
1.7 KiB
Go
package mongo
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import (
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"go.mongodb.org/mongo-driver/v2/bson"
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"go.mongodb.org/mongo-driver/v2/mongo"
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)
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func BuildPaginationPipeline(skip, limit int64, filter bson.M, sort bson.M) mongo.Pipeline {
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pipe := mongo.Pipeline{
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// 1. GLOBAL FILTER: Always filter first to use indexes
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{{Key: "$match", Value: filter}},
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// 3. FACET: Split the pipeline into two parallel paths
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{{Key: "$facet", Value: bson.D{
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// Path A: Get the total count of documents matching the filter
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{Key: "metadata", Value: mongo.Pipeline{
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{{Key: "$count", Value: "total"}},
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}},
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// Path B: Get the specific page of data
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{Key: "data", Value: mongo.Pipeline{
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{{Key: "$skip", Value: skip}},
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{{Key: "$limit", Value: limit}},
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}},
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}}},
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}
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// 2. GLOBAL SORT: Sort here so both 'total' and 'data' facets use the same order
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if sort != nil {
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pipe = append(pipe, bson.D{{Key: "$sort", Value: sort}})
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}
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return pipe
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}
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func BuildPaginationPipelineNext(limit int64, filter bson.M, sort bson.M) mongo.Pipeline {
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return mongo.Pipeline{
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// 1. GLOBAL FILTER: Always filter first to use indexes
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{{Key: "$match", Value: filter}},
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// 2. GLOBAL SORT: Sort here so both 'total' and 'data' facets use the same order
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{{Key: "$sort", Value: sort}},
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// 3. FACET: Split the pipeline into two parallel paths
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{{Key: "$facet", Value: bson.D{
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// Path A: Get the total count of documents matching the filter
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{Key: "metadata", Value: mongo.Pipeline{
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{{Key: "$count", Value: "total"}},
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}},
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// Path B: Get the specific page of data
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{Key: "data", Value: mongo.Pipeline{
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{{Key: "$limit", Value: limit}},
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}},
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}}},
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}
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} |