feat: show related Quantity records when viewing a Unit

src/wuttafarm/web/views/units.py

@@ -24,7 +24,7 @@ Master view for Units
 """
 
 from wuttafarm.web.views import WuttaFarmMasterView
-from wuttafarm.db.model import Measure, Unit
+from wuttafarm.db.model import Measure, Unit, Quantity
 
 
 class MeasureView(WuttaFarmMasterView):
@@ -104,6 +104,26 @@ class UnitView(WuttaFarmMasterView):
         "farmos_uuid",
     ]
 
+    has_rows = True
+    row_model_class = Quantity
+    rows_viewable = True
+
+    row_labels = {
+        "quantity_type_id": "Quantity Type ID",
+        "measure_id": "Measure ID",
+    }
+
+    row_grid_columns = [
+        "drupal_id",
+        "as_text",
+        "quantity_type",
+        "measure",
+        "value",
+        "label",
+    ]
+
+    rows_sort_defaults = ("drupal_id", "desc")
+
     def configure_grid(self, grid):
         g = grid
         super().configure_grid(g)
@@ -131,6 +151,37 @@ class UnitView(WuttaFarmMasterView):
 
         return buttons
 
+    def get_row_grid_data(self, unit):
+        model = self.app.model
+        session = self.Session()
+        return session.query(model.Quantity).filter(model.Quantity.units == unit)
+
+    def configure_row_grid(self, grid):
+        g = grid
+        super().configure_row_grid(g)
+
+        # drupal_id
+        g.set_label("drupal_id", "ID", column_only=True)
+
+        # as_text
+        g.set_renderer("as_text", self.render_as_text_for_grid)
+        g.set_link("as_text")
+
+        # value
+        g.set_renderer("value", self.render_value_for_grid)
+
+    def render_as_text_for_grid(self, quantity, field, value):
+        return quantity.render_as_text(self.config)
+
+    def render_value_for_grid(self, quantity, field, value):
+        value = quantity.value_numerator / quantity.value_denominator
+        return self.app.render_quantity(value)
+
+    def get_row_action_url_view(self, quantity, i):
+        return self.request.route_url(
+            f"quantities_{quantity.quantity_type_id}.view", uuid=quantity.uuid
+        )
+
 
 def defaults(config, **kwargs):
     base = globals()