Fix "actions" on ModelViews with composite primary keys

The refactor in #1398 changes the `get()` function, and mistakenly
always applied the PK filter, even in the case of composite keys.

(The else block of `if self.is_pk_composite` applied it again, so it was
actually applying the same filter twice, which didn't break anything,
but was not needed)

flask_appbuilder/models/sqla/interface.py

@@ -917,7 +917,6 @@ def get(
             _filters = filters.copy()
         else:
             _filters = Filters(self.filter_converter_class, self)
-            _filters.add_filter(pk, self.FilterEqual, id)
 
         if self.is_pk_composite():
             for _pk, _id in zip(pk, id):

flask_appbuilder/tests/test_mvc.py

@@ -4,6 +4,7 @@
 from typing import Set
 
 from flask import Flask, redirect, request, session
+from flask_appbuilder.actions import action
 from flask_appbuilder import AppBuilder, SQLA
 from flask_appbuilder.charts.views import (
     ChartView,
@@ -389,6 +390,12 @@ class Model3View(ModelView):
             add_columns = ["pk1", "pk2", "field_string"]
             edit_columns = ["pk1", "pk2", "field_string"]
 
+            @action("muldelete", "Delete", "Delete all Really?", "fa-rocket", single=False)
+            def muldelete(self, items):
+                self.datamodel.delete_all(items)
+                self.update_redirect()
+                return redirect(self.get_redirect())
+
         class Model1CompactView(CompactCRUDMixin, ModelView):
             datamodel = SQLAInterface(Model1)
 
@@ -829,6 +836,21 @@ def test_model_crud_composite_pk(self):
         model = self.db.session.query(Model3).filter_by(pk1=2).one_or_none()
         self.assertEqual(model, None)
 
+        # Add it back, then delete via muldelete
+        self.appbuilder.get_session.add(Model3(pk1=1, pk2=datetime.datetime(2017, 1, 1), field_string="baz"))
+        self.appbuilder.get_session.commit()
+        rv = client.post(
+            "/model3view/action_post",
+            data=dict(
+                action="muldelete",
+                rowid=[json.dumps(["1", {"_type": "datetime", "value": "2017-01-01T00:00:00.000000"}])],
+            ),
+            follow_redirects=True,
+        )
+        self.assertEqual(rv.status_code, 200)
+        model = self.db.session.query(Model3).filter_by(pk1=1).one_or_none()
+        self.assertEqual(model, None)
+
     def test_model_crud_add_with_enum(self):
         """
             Test Model add for Model with Enum Columns