Hacky way of adding to human description

e.g. ?_m2m_ad_targets__target_id=ec3ac&_m2m_ad_targets__target_id=e128e

datasette/views/table.py

@@ -269,7 +269,7 @@ class TableView(RowTableShared):
         special_args_lists = {}
         other_args = {}
         for key, value in args.items():
-            if key.startswith("_") and "__" not in key:
+            if (key.startswith("_") and "__" not in key) or key.startswith("_m2m_"):
                 special_args[key] = value[0]
                 special_args_lists[key] = value
             else:
@@ -304,6 +304,35 @@ class TableView(RowTableShared):
         filters = Filters(sorted(other_args.items()), units, ureg)
         where_clauses, params = filters.build_where_clauses()
 
+        # Hacky thing for ?_m2m_ad_targets__target_id=9a8c6
+        extra_human_descriptions = []
+        for m2m_key in request.args:
+            if m2m_key.startswith("_m2m_"):
+                rest = m2m_key.split("_m2m_", 1)[1]
+                m2m_table, other_column = rest.split("__", 1)
+                m2m_table_info = self.ds.inspect()[name]["tables"][m2m_table]
+                outgoing_fks = m2m_table_info["foreign_keys"]["outgoing"]
+                fk_to_us = [fk for fk in outgoing_fks if fk["other_table"] == table][0]
+                # fk_to_other = [
+                #     fk for fk in outgoing_fks
+                #     if fk["other_table"] != table
+                #     and fk["other_column"] == other_column
+                # ][0]
+                for value in request.args[m2m_key]:
+                    # Figure out what the columns are in that m2m table
+                    where_clauses.append(
+                        '{our_pk} in (select {our_column} from {m2m_table} where {other_column} = "{value}")'.format(
+                            m2m_table=escape_sqlite(m2m_table),
+                            our_pk=fk_to_us["other_column"],
+                            our_column=fk_to_us["column"],
+                            other_column=escape_sqlite(other_column),
+                            value=value,
+                        )
+                    )
+                    extra_human_descriptions.append(
+                        '{} contains "{}"'.format(m2m_table, value)
+                    )
+
         # _search support:
         fts_table = info[name]["tables"].get(table, {}).get("fts_table")
         search_args = dict(
@@ -719,6 +748,9 @@ class TableView(RowTableShared):
                 [b for b in [human_description_en, sorted_by] if b]
             )
 
+        if extra_human_descriptions:
+            human_description_en += " and ".join(extra_human_descriptions)
+
         async def extra_template():
             display_columns, display_rows = await self.display_columns_and_rows(
                 name,