can delete + search

dbs/dbs.go

@@ -2,6 +2,7 @@ package dbs
 
 import (
 	"fmt"
+	"reflect"
 	"runtime/debug"
 	"strings"
 
@@ -148,6 +149,137 @@ type Filter struct {
 	Value    interface{} `json:"value,omitempty"`
 }
 
+// FiltersFromFlatMap builds a *Filters from a map[string]interface{} whose structure
+// mirrors the JSON form of Filters:
+//
+//	{
+//	  "and": { "name": [{"operator":"like","value":"foo"}] },
+//	  "or":  { "source": [{"operator":"equal","value":"bar"}] }
+//	}
+//
+// Keys inside "and"/"or" are json tag names; the function resolves each to its
+// full dotted BSON path using the target struct. Unknown keys are kept as-is.
+func FiltersFromFlatMap(flatMap map[string]interface{}, target interface{}) *Filters {
+	filters := &Filters{
+		And: make(map[string][]Filter),
+		Or:  make(map[string][]Filter),
+	}
+	paths := jsonToBsonPaths(reflect.TypeOf(target), "")
+	resolve := func(jsonKey string) string {
+		if p, ok := paths[jsonKey]; ok {
+			return p
+		}
+		return jsonKey
+	}
+	parseFilters := func(raw interface{}) map[string][]Filter {
+		out := make(map[string][]Filter)
+		m, ok := raw.(map[string]interface{})
+		if !ok {
+			return out
+		}
+		for jsonKey, val := range m {
+			bsonKey := resolve(jsonKey)
+			items, ok := val.([]interface{})
+			if !ok {
+				continue
+			}
+			for _, item := range items {
+				entry, ok := item.(map[string]interface{})
+				if !ok {
+					continue
+				}
+				f := Filter{}
+				if op, ok := entry["operator"].(string); ok {
+					f.Operator = op
+				}
+				if v, ok := entry["value"]; ok {
+					f.Value = v
+				}
+				out[bsonKey] = append(out[bsonKey], f)
+			}
+		}
+		return out
+	}
+	if and, ok := flatMap["and"]; ok {
+		filters.And = parseFilters(and)
+	}
+	if or, ok := flatMap["or"]; ok {
+		filters.Or = parseFilters(or)
+	}
+	return filters
+}
+
+// jsonToBsonPaths recursively walks a struct type and returns a map of
+// json_name → dotted_bson_path for every field reachable from that type.
+//
+// Anonymous embedded fields without any tag follow the BSON convention of this
+// codebase: they are stored as a nested sub-document whose key is the lowercased
+// struct type name (e.g. utils.AbstractObject → "abstractobject").
+func jsonToBsonPaths(t reflect.Type, prefix string) map[string]string {
+	for t.Kind() == reflect.Ptr || t.Kind() == reflect.Slice {
+		t = t.Elem()
+	}
+	result := make(map[string]string)
+	if t.Kind() != reflect.Struct {
+		return result
+	}
+	for i := 0; i < t.NumField(); i++ {
+		field := t.Field(i)
+
+		jsonTag := field.Tag.Get("json")
+		bsonTag := field.Tag.Get("bson")
+		jsonName := strings.Split(jsonTag, ",")[0]
+		bsonName := strings.Split(bsonTag, ",")[0]
+
+		// Anonymous embedded struct with no tags: use lowercase type name as BSON prefix.
+		if field.Anonymous && jsonName == "" && bsonName == "" {
+			ft := field.Type
+			for ft.Kind() == reflect.Ptr {
+				ft = ft.Elem()
+			}
+			if ft.Kind() == reflect.Struct {
+				embedPrefix := strings.ToLower(ft.Name())
+				if prefix != "" {
+					embedPrefix = prefix + "." + embedPrefix
+				}
+				for k, v := range jsonToBsonPaths(ft, embedPrefix) {
+					if _, exists := result[k]; !exists {
+						result[k] = v
+					}
+				}
+			}
+			continue
+		}
+
+		if jsonName == "" || jsonName == "-" {
+			continue
+		}
+		if bsonName == "" || bsonName == "-" {
+			bsonName = jsonName
+		}
+
+		fullPath := bsonName
+		if prefix != "" {
+			fullPath = prefix + "." + bsonName
+		}
+
+		result[jsonName] = fullPath
+
+		ft := field.Type
+		for ft.Kind() == reflect.Ptr || ft.Kind() == reflect.Slice {
+			ft = ft.Elem()
+		}
+		if ft.Kind() == reflect.Struct {
+			for k, v := range jsonToBsonPaths(ft, fullPath) {
+				if _, exists := result[k]; !exists {
+					result[k] = v
+				}
+			}
+		}
+	}
+	return result
+}
+
 type Input = map[string]interface{}
 
 func InputToBson(i Input, isUpdate bool) bson.D {