Prepare for beta 2

CHANGELOG.md

@@ -1,3 +1,25 @@
+# 2.0.0-beta.2
+
+* **BREAKING CHANGE**: Replaced `IsZero()` methods with `HasData()` methods on all
+  result structs (including Names). The new methods provide clearer semantics:
+  `HasData()` returns `true` when GeoIP data is found and `false` when no data is
+  available. Unlike `IsZero()`, `HasData()` excludes Network and IPAddress fields
+  from validation, allowing users to access network topology information even when
+  no GeoIP data is found. The Network and IPAddress fields are now always
+  populated for all lookups, regardless of whether GeoIP data is available.
+* **BREAKING CHANGE**: Replaced all anonymous nested structs with named types to
+  improve struct initialization ergonomics. All result structs (Enterprise, City,
+  Country) now use named types like `EnterpriseCityRecord`, `CityTraits`,
+  `CountryRecord`, etc. This makes it much easier to initialize structs in user
+  code while maintaining the same JSON serialization behavior.
+* **BREAKING CHANGE**: Changed `Location.Latitude` and `Location.Longitude` from
+  `float64` to `*float64` to properly distinguish between missing coordinates and
+  the valid location (0, 0). Missing coordinates are now represented as `nil`
+  and are omitted from JSON output, while valid zero coordinates are preserved.
+  This fixes the ambiguity where (0, 0) was incorrectly treated as "no data".
+  Added `Location.HasCoordinates()` method for safe coordinate access. Reported
+  by Nick Bruun. GitHub #5.
+
 # 2.0.0-beta.1 - 2025-06-22
 
 * **BREAKING CHANGE**: Updated to use `maxminddb-golang/v2` which provides

README.md

@@ -11,7 +11,7 @@ This library is built using
 data for the database record is decoded using this library. Version 2.0
 provides significant performance improvements with 56% fewer allocations and
 34% less memory usage compared to v1. Version 2.0 also adds `Network` and
-`IPAddress` fields to all result structs, and includes an `IsZero()` method to
+`IPAddress` fields to all result structs, and includes a `HasData()` method to
 easily check if data was found. If you only need several fields, you may get
 superior performance by using maxminddb's `Lookup` directly with a result
 struct that only contains the required fields. (See
@@ -32,7 +32,7 @@ Version 2.0 includes several major improvements:
 - **Modern API**: Uses `netip.Addr` instead of `net.IP` for better performance
 - **Network Information**: All result structs now include `Network` and
   `IPAddress` fields
-- **Data Validation**: New `IsZero()` method to easily check if data was found
+- **Data Validation**: New `HasData()` method to easily check if data was found
 - **Structured Names**: Replaced `map[string]string` with typed `Names` struct
   for better performance
 - **Go 1.24 Support**: Uses `omitzero` JSON tags to match MaxMind database
@@ -71,7 +71,7 @@ func main() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP")
 		return
 	}
@@ -82,7 +82,9 @@ func main() {
 	fmt.Printf("Russian country name: %v\n", record.Country.Names.Russian)
 	fmt.Printf("ISO country code: %v\n", record.Country.ISOCode)
 	fmt.Printf("Time zone: %v\n", record.Location.TimeZone)
-	fmt.Printf("Coordinates: %v, %v\n", record.Location.Latitude, record.Location.Longitude)
+	if record.Location.HasCoordinates() {
+		fmt.Printf("Coordinates: %v, %v\n", *record.Location.Latitude, *record.Location.Longitude)
+	}
 	// Output:
 	// Portuguese (BR) city name: Londres
 	// English subdivision name: England
@@ -151,7 +153,7 @@ func main() {
 		log.Fatal(err)
 	}
 
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP")
 		return
 	}
@@ -161,7 +163,9 @@ func main() {
 	fmt.Printf("Country: %v (%v)\n", record.Country.Names.English, record.Country.ISOCode)
 	fmt.Printf("Continent: %v (%v)\n", record.Continent.Names.English, record.Continent.Code)
 	fmt.Printf("Postal Code: %v\n", record.Postal.Code)
-	fmt.Printf("Location: %v, %v\n", record.Location.Latitude, record.Location.Longitude)
+	if record.Location.HasCoordinates() {
+		fmt.Printf("Location: %v, %v\n", *record.Location.Latitude, *record.Location.Longitude)
+	}
 	fmt.Printf("Time Zone: %v\n", record.Location.TimeZone)
 	fmt.Printf("Network: %v\n", record.Traits.Network)
 	fmt.Printf("IP Address: %v\n", record.Traits.IPAddress)
@@ -200,7 +204,7 @@ func main() {
 		log.Fatal(err)
 	}
 
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP")
 		return
 	}
@@ -251,7 +255,7 @@ func main() {
 		log.Fatal(err)
 	}
 
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP")
 		return
 	}
@@ -296,7 +300,7 @@ func main() {
 		log.Fatal(err)
 	}
 
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP")
 		return
 	}
@@ -345,15 +349,17 @@ func main() {
 		log.Fatal(err)
 	}
 
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP")
 		return
 	}
 
 	// Basic location information
 	fmt.Printf("City: %v\n", record.City.Names.English)
 	fmt.Printf("Country: %v (%v)\n", record.Country.Names.English, record.Country.ISOCode)
-	fmt.Printf("Location: %v, %v\n", record.Location.Latitude, record.Location.Longitude)
+	if record.Location.HasCoordinates() {
+		fmt.Printf("Location: %v, %v\n", *record.Location.Latitude, *record.Location.Longitude)
+	}
 
 	// Enterprise-specific fields
 	fmt.Printf("ISP: %v\n", record.Traits.ISP)
@@ -410,7 +416,7 @@ func main() {
 		log.Fatal(err)
 	}
 
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP")
 		return
 	}
@@ -464,7 +470,7 @@ func main() {
 		log.Fatal(err)
 	}
 
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP")
 		return
 	}
@@ -507,7 +513,7 @@ func main() {
 		log.Fatal(err)
 	}
 
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP")
 		return
 	}
@@ -551,7 +557,7 @@ func main() {
 	}
 
 	// Always check if data was found
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP address")
 		return
 	}
@@ -627,7 +633,7 @@ fmt.Println(string(jsonData))
 - **IP Type**: Use `netip.Addr` instead of `net.IP`
 - **Field Names**: `IsoCode` → `ISOCode`
 - **Names Access**: Use struct fields instead of map access
-- **Data Validation**: Use `IsZero()` method to check for data availability
+- **Data Validation**: Use `HasData()` method to check for data availability
 
 ### Migration Example
 
@@ -647,7 +653,7 @@ if err != nil {
     // handle error
 }
 record, err := db.City(ip)
-if record.IsZero() {
+if !record.HasData() {
     // handle no data found
 }
 cityName := record.City.Names.English
@@ -659,7 +665,7 @@ cityName := record.City.Names.English
 
 **Database not found**: Ensure the .mmdb file path is correct and readable.
 
-**No data returned**: Check if `IsZero()` returns true - the IP may not be in
+**No data returned**: Check if `HasData()` returns false - the IP may not be in
 the database or may be a private/reserved IP.
 
 **Performance issues**: Ensure you're reusing the database instance rather than

example_test.go

@@ -28,7 +28,11 @@ func Example() {
 	fmt.Printf("Russian country name: %v\n", record.Country.Names.Russian)
 	fmt.Printf("ISO country code: %v\n", record.Country.ISOCode)
 	fmt.Printf("Time zone: %v\n", record.Location.TimeZone)
-	fmt.Printf("Coordinates: %v, %v\n", record.Location.Latitude, record.Location.Longitude)
+	if record.Location.HasCoordinates() {
+		fmt.Printf("Coordinates: %v, %v\n", *record.Location.Latitude, *record.Location.Longitude)
+	} else {
+		fmt.Println("Coordinates: unavailable")
+	}
 	// Output:
 	// Portuguese (BR) city name: Londres
 	// English subdivision name: England
@@ -55,7 +59,7 @@ func ExampleReader_City() {
 		log.Panic(err)
 	}
 
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP")
 		return
 	}
@@ -86,7 +90,7 @@ func ExampleReader_Country() {
 		log.Panic(err)
 	}
 
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP")
 		return
 	}
@@ -115,7 +119,7 @@ func ExampleReader_ASN() {
 		log.Panic(err)
 	}
 
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP")
 		return
 	}
@@ -144,7 +148,7 @@ func ExampleReader_AnonymousIP() {
 		log.Panic(err)
 	}
 
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP")
 		return
 	}
@@ -175,7 +179,7 @@ func ExampleReader_Enterprise() {
 		log.Panic(err)
 	}
 
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP")
 		return
 	}
@@ -208,7 +212,7 @@ func ExampleReader_ISP() {
 		log.Panic(err)
 	}
 
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP")
 		return
 	}
@@ -239,7 +243,7 @@ func ExampleReader_Domain() {
 		log.Panic(err)
 	}
 
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP")
 		return
 	}
@@ -266,7 +270,7 @@ func ExampleReader_ConnectionType() {
 		log.Panic(err)
 	}
 
-	if record.IsZero() {
+	if !record.HasData() {
 		fmt.Println("No data found for this IP")
 		return
 	}