feat: multi tenancy support

app/apps/common/forms.py

@@ -0,0 +1,95 @@
+from crispy_forms.bootstrap import FormActions
+from django import forms
+from django.contrib.auth import get_user_model
+from django.utils.translation import gettext_lazy as _
+from crispy_forms.helper import FormHelper
+from crispy_forms.layout import Layout, Field, Submit, Div, HTML
+
+from apps.common.widgets.tom_select import TomSelect, TomSelectMultiple
+from apps.common.models import SharedObject
+from apps.common.widgets.crispy.submit import NoClassSubmit
+
+User = get_user_model()
+
+
+class SharedObjectForm(forms.Form):
+    """
+    Generic form for editing visibility and sharing settings
+    for models inheriting from SharedObject.
+    """
+
+    owner = forms.ModelChoiceField(
+        queryset=User.objects.all(),
+        required=False,
+        label=_("Owner"),
+        widget=TomSelect(clear_button=False),
+        help_text=_(
+            "The owner of this object, if empty all users can see, edit and take ownership."
+        ),
+    )
+    shared_with_users = forms.ModelMultipleChoiceField(
+        queryset=User.objects.all(),
+        required=False,
+        widget=TomSelectMultiple(clear_button=True),
+        label=_("Shared with users"),
+        help_text=_("Select users to share this object with"),
+    )
+    visibility = forms.ChoiceField(
+        choices=SharedObject.Visibility.choices,
+        required=True,
+        label=_("Visibility"),
+        help_text=_(
+            "Private: Only shown for the owner and shared users. Only editable by the owner."
+            "<br/>"
+            "Public: Shown for all users. Only editable by the owner."
+        ),
+    )
+
+    class Meta:
+        fields = ["visibility", "shared_with_users"]
+        widgets = {
+            "visibility": TomSelect(clear_button=False),
+        }
+
+    def __init__(self, *args, **kwargs):
+        # Get the current user to filter available sharing options
+        self.user = kwargs.pop("user", None)
+        self.instance = kwargs.pop("instance", None)
+
+        super().__init__(*args, **kwargs)
+
+        # Pre-populate shared users if instance exists
+        if self.instance:
+            self.fields["shared_with_users"].initial = self.instance.shared_with.all()
+            self.fields["visibility"].initial = self.instance.visibility
+            self.fields["owner"].initial = self.instance.owner
+
+        # Set up crispy form helper
+        self.helper = FormHelper()
+        self.helper.form_method = "post"
+        self.helper.form_tag = False
+
+        self.helper.layout = Layout(
+            Field("owner"),
+            Field("visibility"),
+            HTML("<hr>"),
+            Field("shared_with_users"),
+            FormActions(
+                NoClassSubmit(
+                    "submit", _("Save"), css_class="btn btn-outline-primary w-100"
+                ),
+            ),
+        )
+
+    def save(self):
+        instance = self.instance
+
+        instance.visibility = self.cleaned_data["visibility"]
+        instance.owner = self.cleaned_data["owner"]
+
+        instance.save()
+
+        # Clear and set shared_with users
+        instance.shared_with.set(self.cleaned_data.get("shared_with_users", []))
+
+        return instance