[plotters] models - Plotterparameters are deletable ONLY if not sharing status

is Private

beat/web/plotters/models.py

@@ -50,6 +50,7 @@ from ..common.models import get_contribution_description_filename
 from ..code.models import Code
 from ..code.models import CodeManager
 from ..code.models import get_contribution_source_code_filename
+from ..common.models import Shareable
 
 import simplejson
 import collections
@@ -275,6 +276,15 @@ class PlotterParameter(Contribution):
     description       = models.TextField(default='', blank=True, null=True, help_text=Messages['description'])
     plotter           = models.ForeignKey(Plotter, related_name='plotting_parameters', null=True)
 
+    #_____ Methods __________
+
+    def modifiable(self):
+        """Can be modified if nobody points at me"""
+        return super(PlotterParameter, self).modifiable() and (self.defaults.count() == 0)
+
+    def deletable(self):
+        """Can be deleted if nobody points at me"""
+        return super(PlotterParameter, self).deletable() and (self.defaults.count() == 0) and (self.sharing == Shareable.PRIVATE)
 
     #_____ Utilities __________