Fix the form for adopting a project

readthedocs/gold/forms.py

@@ -6,6 +6,7 @@
 from django import forms
 
 from readthedocs.payments.forms import StripeModelForm, StripeResourceMixin
+from readthedocs.projects.models import Project
 
 from .models import LEVEL_CHOICES, GoldUser
 
@@ -88,6 +89,18 @@ def __init__(self, *args, **kwargs):
         self.projects = kwargs.pop('projects', None)
         super(GoldProjectForm, self).__init__(*args, **kwargs)
 
+    def clean_project(self):
+        cleaned_data = super(GoldProjectForm, self).clean()
+        project_slug = cleaned_data.get('project', '')
+        project_instance = Project.objects.filter(slug=project_slug)
+
+        # Checking if the project with the entered slug
+        # is absent or present in the database.
+        if not project_instance.exists():
+            raise forms.ValidationError('No project found.')
+        else:
+            return project_slug
+
     def clean(self):
         cleaned_data = super(GoldProjectForm, self).clean()
         if self.projects.count() < self.user.num_supported_projects:

readthedocs/rtd_tests/tests/test_gold.py

@@ -26,6 +26,11 @@ def test_adding_projects(self):
         self.assertEqual(self.golduser.projects.count(), 1)
         self.assertEqual(resp.status_code, 302)
 
+    def test_incorrect_input_when_adding_projects(self):
+        self.assertEqual(self.golduser.projects.count(), 0)
+        resp = self.client.post(reverse('gold_projects'), data={'project': 'random-incorrect-slug'})
+        self.assertFormError(resp, form='form', field='project', errors='No project found.')
+
     def test_too_many_projects(self):
         self.project2 = get(Project, slug='test2')