CptLemming · August 6, 2015 09:36 · Aug 6, 2015
diff --git a/fields.py b/fields.py
@@ -0,0 +1,36 @@
+from django import forms
+from django.core.validators import validate_email, EMPTY_VALUES
+from django.utils.translation import ugettext_lazy as _
+
+
+class CommaSeparatedEmailField(forms.Field):
+    description = _('Email addresses')
+
+    def __init__(self, *args, **kwargs):
+        self.token = kwargs.pop('token', ',')
+        super(CommaSeparatedEmailField, self).__init__(*args, **kwargs)
+
+    def to_python(self, value):
+        if value in EMPTY_VALUES:
+            return []
+
+        value = [item.strip() for item in value.split(self.token) if item.strip()]
+
+        return list(set(value))
+
+    def clean(self, value):
+        """
+        Check that the field contains one or more 'comma-separated' emails
+        and normalizes the data to a list of the email strings.
+        """
+        value = self.to_python(value)
+
+        if value in EMPTY_VALUES and self.required:
+            raise forms.ValidationError(_('This field is required.'))
+
+        for email in value:
+            try:
+                validate_email(email)
+            except forms.ValidationError:
+                raise forms.ValidationError(_("'%s' is not a valid email address.") % email)
+        return value