fix

internal/app/team_registration_test.go

@@ -30,6 +30,7 @@ func TestTeamRegistrationHandler(t *testing.T) {
 		{"extra object", "secret", "Bearer secret", "42", "delivery", valid + ` {}`, nil, 400, false},
 		{"unknown field", "secret", "Bearer secret", "42", "delivery", `{"extra":1}`, nil, 400, false},
 		{"jsonrpc", "secret", "Bearer secret", "42", "delivery", `{"jsonrpc":"2.0","method":"register","params":{"name":"Команда","email":"captain@example.org","participantsCount":5},"id":1}`, nil, 200, true},
+		{"jsonrpc string count", "secret", "Bearer secret", "42", "delivery", `{"jsonrpc":"2.0","method":"register","params":{"name":"Команда","email":"captain@example.org","participantsCount":"5"},"id":1}`, nil, 200, true},
 		{"too large", "secret", "Bearer secret", "42", "delivery", `{"name":"` + strings.Repeat("a", 17000) + `"}`, nil, 400, false},
 		{"invalid fields", "secret", "Bearer secret", "42", "delivery", valid, game_service.ErrInvalidRegistration, 400, true},
 		{"closed", "secret", "Bearer secret", "42", "delivery", valid, teams_repo.ErrRegistrationClosed, 409, true},

internal/services/game_service/registration.go

@@ -1,9 +1,12 @@
 package game_service
 
 import (
+	"bytes"
 	"context"
+	"encoding/json"
 	"errors"
 	"net/mail"
+	"strconv"
 	"strings"
 	"unicode/utf8"
 )
@@ -16,6 +19,37 @@ type Registration struct {
 	ParticipantsCount int32  `json:"participantsCount"`
 }
 
+func (r *Registration) UnmarshalJSON(data []byte) error {
+	var payload struct {
+		Name              string          `json:"name"`
+		Email             string          `json:"email"`
+		ParticipantsCount json.RawMessage `json:"participantsCount"`
+	}
+	decoder := json.NewDecoder(bytes.NewReader(data))
+	decoder.DisallowUnknownFields()
+	if err := decoder.Decode(&payload); err != nil {
+		return err
+	}
+	r.Name = payload.Name
+	r.Email = payload.Email
+	if len(payload.ParticipantsCount) == 0 {
+		return nil
+	}
+	if err := json.Unmarshal(payload.ParticipantsCount, &r.ParticipantsCount); err == nil {
+		return nil
+	}
+	var value string
+	if err := json.Unmarshal(payload.ParticipantsCount, &value); err != nil {
+		return errors.New(`поле "participantsCount" должно быть целым числом или строкой с целым числом`)
+	}
+	count, err := strconv.ParseInt(value, 10, 32)
+	if err != nil {
+		return errors.New(`поле "participantsCount" должно быть целым числом или строкой с целым числом`)
+	}
+	r.ParticipantsCount = int32(count)
+	return nil
+}
+
 func (r *Registration) Validate() error {
 	r.Name = strings.TrimSpace(r.Name)
 	r.Email = strings.TrimSpace(r.Email)