Do not allow to choose resource unit when min == max

uncloud_v3/app/forms.py

@@ -1,4 +1,6 @@
 from django import forms
+from django.forms import NumberInput
+
 
 class ProductOneTimeOrderForm(forms.Form):
     """
@@ -12,7 +14,15 @@ class ProductOneTimeOrderForm(forms.Form):
         for res in resources:
             print(res)
             field_name = f"{res.slug}"
-            self.fields[field_name] = forms.FloatField(required=True, label=res.name)
+            if res.minimum_units < res.maximum_units:
+                self.fields[field_name] = forms.FloatField(
+                    required=True,
+                    label=res.name,
+                    min_value=res.minimum_units,
+                    max_value=res.maximum_units,
+                    widget=NumberInput(attrs={"step": res.step_size}))
+            else:
+                self.fields[field_name] = forms.FloatField(widget=forms.HiddenInput(attrs={'value': res.minimum_units}))
 
     def clean(self):
         cleaned_data = super().clean()