db: Give Decades a PlaylistState property

Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

db/decade.py

@@ -1,12 +1,13 @@
 # Copyright 2021 (c) Anna Schumaker.
 #
 # Table: decades
-# +----------+--------+
-# | decadeid | decade |
-# +----------+--------+
+# +----------+-----------+--------+
+# | decadeid | plstateid | decade |
+# +----------+-----------+--------+
 from gi.repository import GObject
 from . import execute
 from . import objects
+from . import state
 from . import year
 
 class Decade(objects.Row):
@@ -27,6 +28,10 @@ class Decade(objects.Row):
     def decade(self):
         return self.get_column("decade")
 
+    @GObject.Property
+    def playlist_state(self):
+        return state.PlaylistState(self.get_column("plstateid"))
+
 
 class DecadeTable(objects.Table):
     def __init__(self):
@@ -35,13 +40,17 @@ class DecadeTable(objects.Table):
     def do_create(self):
         execute("CREATE TABLE IF NOT EXISTS decades "
                     "(decadeid INTEGER PRIMARY KEY, "
-                    " decade INTEGER UNIQUE)")
+                    " plstateid INTEGER NOT NULL, "
+                    " decade INTEGER UNIQUE, "
+                    " FOREIGN KEY(plstateid) REFERENCES playlist_states(plstateid))")
 
     def do_insert(self, decade):
-        return execute("INSERT INTO decades (decade) "
-                       "VALUES (?)", (decade,))
+        plstate = state.Table.insert(random=False, loop=False)
+        return execute("INSERT INTO decades (plstateid,decade) "
+                       "VALUES (?, ?)", [ int(plstate), decade ])
 
     def do_delete(self, decade):
+        state.Table.delete(decade.playlist_state)
         return execute("DELETE FROM decades WHERE decadeid=?", [ int(decade) ])
 
     def do_get(self, rowid):

db/test_decade.py

@@ -11,7 +11,7 @@ class TestDecadeTable(unittest.TestCase):
 
     def test_decade_table_init(self):
         self.assertIsInstance(db.decade.Table, db.decade.DecadeTable)
-        db.execute("SELECT decadeid,decade FROM decades")
+        db.execute("SELECT decadeid,plstateid,decade FROM decades")
 
     def test_decade_table_insert(self):
         decade = db.decade.Table.insert(2020)
@@ -21,14 +21,18 @@ class TestDecadeTable(unittest.TestCase):
 
         self.assertEqual(decade.decade, 2020)
         self.assertEqual(str(decade), "2020s")
+        self.assertIsInstance(decade.playlist_state, db.state.PlaylistState)
 
         with self.assertRaises(sqlite3.IntegrityError):
             db.decade.Table.insert(2020)
 
     def test_decade_table_delete(self):
         decade = db.decade.Table.find(2020)
+        state  = decade.playlist_state
+
         db.decade.Table.delete(decade)
         self.assertIsNone(db.decade.Table.lookup(2020))
+        self.assertIsNone(db.state.Table.get(int(state)))
 
     def test_decade_table_get(self):
         decade = db.decade.Table.insert(2020)