Initial import

pipeline.go

@@ -0,0 +1,52 @@
+package mongo
+
+import (
+  "go.mongodb.org/mongo-driver/v2/bson"
+  "go.mongodb.org/mongo-driver/v2/mongo"
+)
+
+func BuildPaginationPipeline(skip, limit int64, filter bson.M, sort bson.M) mongo.Pipeline {
+  return mongo.Pipeline{
+    // 1. GLOBAL FILTER: Always filter first to use indexes
+    {{Key: "$match", Value: filter}},
+    
+    // 2. GLOBAL SORT: Sort here so both 'total' and 'data' facets use the same order
+    {{Key: "$sort", Value: sort}},
+
+    // 3. FACET: Split the pipeline into two parallel paths
+    {{Key: "$facet", Value: bson.D{
+      // Path A: Get the total count of documents matching the filter
+      {Key: "metadata", Value: mongo.Pipeline{
+          {{Key: "$count", Value: "total"}},
+      }},
+      // Path B: Get the specific page of data
+      {Key: "data", Value: mongo.Pipeline{
+          {{Key: "$skip", Value: skip}},
+          {{Key: "$limit", Value: limit}},
+      }},
+    }}},
+  }
+}
+
+func BuildPaginationPipelineNext(limit int64, filter bson.M, sort bson.M) mongo.Pipeline {
+  
+  return mongo.Pipeline{
+    // 1. GLOBAL FILTER: Always filter first to use indexes
+    {{Key: "$match", Value: filter}},
+    
+    // 2. GLOBAL SORT: Sort here so both 'total' and 'data' facets use the same order
+    {{Key: "$sort", Value: sort}},
+
+    // 3. FACET: Split the pipeline into two parallel paths
+    {{Key: "$facet", Value: bson.D{
+      // Path A: Get the total count of documents matching the filter
+      {Key: "metadata", Value: mongo.Pipeline{
+          {{Key: "$count", Value: "total"}},
+      }},
+      // Path B: Get the specific page of data
+      {Key: "data", Value: mongo.Pipeline{
+          {{Key: "$limit", Value: limit}},
+      }},
+    }}},
+  }
+}