old_contents: from django.utils.translation import ugettext as _
  
  from rest_framework.serializers import ModelSerializer, ValidationError
  
  from reg.models import Team
  
  
  class TeamSerializer(ModelSerializer):
  
      def validate(self, data):
          if 'is_school' in data and data['is_school']:
              error_dict = {}
              if 'school_name' not in data or not data['school_name'].strip():
                  error_dict['school_name'] = [_('The field is required for school teams')]
              if 'teacher_name' not in data or not data['teacher_name'].strip():
                  error_dict['teacher_name'] = [_('The field is required for school teams')]
              if 'teacher_email' not in data or not data['teacher_email'].strip():
                  error_dict['teacher_email'] = [_('The field is required for school teams')]
              if 'address' not in data or not data['address'].strip():
                  error_dict['address'] = [_('The field is required for school teams')]
          if len(error_dict) > 0:
              raise ValidationError(error_dict)
          return data
  
      class Meta:
          model = Team
          exclude = ('auth_string',)
          read_only_fields = ('id', 'created_at')
  
new_contents: from django.utils.translation import ugettext as _
  
  from rest_framework.serializers import ModelSerializer, ValidationError
  
  from reg.models import Team
  
  
  class TeamSerializer(ModelSerializer):
  
      def validate(self, data):
          error_dict = {}
          if 'is_school' in data and data['is_school']:
              if 'school_name' not in data or not data['school_name'].strip():
                  error_dict['school_name'] = [_('The field is required for school teams')]
              if 'teacher_name' not in data or not data['teacher_name'].strip():
                  error_dict['teacher_name'] = [_('The field is required for school teams')]
              if 'teacher_email' not in data or not data['teacher_email'].strip():
                  error_dict['teacher_email'] = [_('The field is required for school teams')]
              if 'address' not in data or not data['address'].strip():
                  error_dict['address'] = [_('The field is required for school teams')]
          if len(error_dict) > 0:
              raise ValidationError(error_dict)
          return data
  
      class Meta:
          model = Team
          exclude = ('auth_string',)
          read_only_fields = ('id', 'created_at')
  
subject: Fix bug with registering non-school teams