Add Find with offset

pipeline.go

@@ -6,13 +6,10 @@ import (
 )
 
 func BuildPaginationPipeline(skip, limit int64, filter bson.M, sort bson.M) mongo.Pipeline {
-  return mongo.Pipeline{
+  pipe := 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
@@ -26,6 +23,13 @@ func BuildPaginationPipeline(skip, limit int64, filter bson.M, sort bson.M) mong
       }},
     }}},
   }
+
+  // 2. GLOBAL SORT: Sort here so both 'total' and 'data' facets use the same order
+  if sort != nil {
+    pipe = append(pipe, bson.D{{Key: "$sort", Value: sort}})
+  }
+
+  return pipe
 }
 
 func BuildPaginationPipelineNext(limit int64, filter bson.M, sort bson.M) mongo.Pipeline {