environment: parse float value as json integers in variables (#31332)

If you need a real integer you must always put a decimal point, i.e.
write 1.0 not 1.

hobo/environment/models.py

@@ -1,3 +1,4 @@
+import re
 import datetime
 import json
 import random
@@ -22,6 +23,9 @@ from .mandayejs_app_settings import APP_SETTINGS_CLASSES, DEFAULT_APP_SETTINGS
 
 SECRET_CHARS = 'abcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*(-_=+)'
 
+FLOAT_RE = re.compile(r'^\s*[0-9]+\.[0-9]+\s*')
+
+
 class Variable(models.Model):
     name = models.CharField(max_length=100, verbose_name=_('name'))
     label = models.CharField(max_length=100, blank=True, verbose_name=_('label'))
@@ -39,21 +43,26 @@ class Variable(models.Model):
             return self.label
         return self.name
 
-    @property
-    def json(self):
-        if self.value and (self.value[0] in '{[' or self.value in ('true', 'false')):
+    def _parse_value_as_json(self):
+        if self.value and (
+                self.value[0] in '{['
+                or self.value in ('true', 'false')
+                or FLOAT_RE.match(self.value)):
             try:
                 return json.loads(self.value)
             except ValueError:
-                pass
+                raise ValidationError('invalid JSON document')
         return self.value
 
+    @property
+    def json(self):
+        try:
+            return self._parse_value_as_json()
+        except ValidationError:
+            return self.value
+
     def clean(self):
-        if self.value and (self.value[0] in '{[' or self.value in ('true', 'false')):
-            try:
-                json.loads(self.value)
-            except ValueError:
-                raise ValidationError('invalid JSON document')
+        self._parse_value_as_json()
 
 
 class ServiceBase(models.Model):