old_contents: from rest_framework import serializers
  
  from ..utils.fields import DomainNameField
  from .fields import SignupDomainsField
  from .models import Account
  
  
  class ValidateSignupDomainsSerializer(serializers.Serializer):
      """
      Serializer that handles signup domains validation endpoint.
      """
      signup_domains = SignupDomainsField()
  
  
  class AccountSerializer(serializers.ModelSerializer):
      """
      Serializer for Accounts.
      """
      class Meta:
          model = Account
          fields = ('id', 'name', 'slug', 'disqus_shortname', 'logo_color',
                    'date_created', 'date_modified')
  
  
  class CheckSignupDomainSerializer(serializers.Serializer):
      """
      Serializer to get account that has signup domain setup.
      """
      signup_domain = DomainNameField()
  
      def validate_signup_domain(self, attrs, source):
          signup_domain = attrs[source]
          data = {}
  
          try:
              account = Account.objects.get(
                  allow_signup=True, email_domains__domain_name=signup_domain)
              data = AccountSerializer(account).data
          except Account.DoesNotExist:
              pass
  
          return data
  
new_contents: from rest_framework import serializers
  
  from ..utils.fields import DomainNameField
  from .fields import SignupDomainsField
  from .models import Account
  
  
  class ValidateSignupDomainsSerializer(serializers.Serializer):
      """
      Serializer that handles signup domains validation endpoint.
      """
      signup_domains = SignupDomainsField()
  
  
  class AccountSerializer(serializers.ModelSerializer):
      """
      Serializer for Accounts.
      """
      class Meta:
          model = Account
          read_only_fields = ('logo_color', )
          fields = ('id', 'name', 'slug', 'disqus_shortname', 'logo_color',
                    'date_created', 'date_modified')
  
  
  class CheckSignupDomainSerializer(serializers.Serializer):
      """
      Serializer to get account that has signup domain setup.
      """
      signup_domain = DomainNameField()
  
      def validate_signup_domain(self, attrs, source):
          signup_domain = attrs[source]
          data = {}
  
          try:
              account = Account.objects.get(
                  allow_signup=True, email_domains__domain_name=signup_domain)
              data = AccountSerializer(account).data
          except Account.DoesNotExist:
              pass
  
          return data
  
subject: Set Account logo_color to be read only