db: Create a DecadeTable and Decade object

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

db/__init__.py

@@ -15,9 +15,10 @@ from . import artist
 from . import album
 from . import disc
 from . import genre
+from . import decade
 
 def reset():
-    mods = [ artist, album, disc, genre ]
+    mods = [ artist, album, disc, genre, decade ]
 
     for mod in mods: mod.Table.drop()
     for mod in mods: mod.Table.do_create()

db/decade.py

@@ -0,0 +1,50 @@
+# Copyright 2021 (c) Anna Schumaker.
+#
+# Table: decades
+# +----------+--------+
+# | decadeid | decade |
+# +----------+--------+
+from gi.repository import GObject
+from . import execute
+from . import objects
+
+class Decade(objects.Row):
+    def __gt__(self, rhs): return self.decade > rhs.decade
+    def __lt__(self, rhs): return self.decade < rhs.decade
+    def __str__(self): return f"{self.decade}s"
+
+    def do_get_column(self, column):
+        return execute(f"SELECT {column} FROM decades "
+                        "WHERE decadeid=?", [ self.rowid ])
+
+    @GObject.Property
+    def decade(self):
+        return self.get_column("decade")
+
+
+class DecadeTable(objects.Table):
+    def __init__(self):
+        objects.Table.__init__(self, "decades", Decade)
+
+    def do_create(self):
+        execute("CREATE TABLE IF NOT EXISTS decades "
+                    "(decadeid INTEGER PRIMARY KEY, "
+                    " decade INTEGER UNIQUE)")
+
+    def do_insert(self, decade):
+        return execute("INSERT INTO decades (decade) "
+                       "VALUES (?)", (decade,))
+
+    def do_delete(self, decade):
+        return execute("DELETE FROM decades WHERE decadeid=?", [ int(decade) ])
+
+    def do_get(self, rowid):
+        return execute("SELECT decadeid FROM decades "
+                       "WHERE decadeid=?", [ rowid ])
+
+    def do_lookup(self, decade):
+        return execute("SELECT decadeid FROM decades "
+                       "WHERE decade=?", [ decade ])
+
+
+Table = DecadeTable()

db/test_decade.py

@@ -0,0 +1,51 @@
+# Copyright 2021 (c) Anna Schumaker.
+import db
+import sqlite3
+import unittest
+from gi.repository import GObject
+
+
+class TestDecadeTable(unittest.TestCase):
+    def setUp(self):
+        db.reset()
+
+    def test_decade_table_init(self):
+        self.assertIsInstance(db.decade.Table, db.decade.DecadeTable)
+        db.execute("SELECT decadeid,decade FROM decades")
+
+    def test_decade_table_insert(self):
+        decade = db.decade.Table.insert(2020)
+
+        self.assertIsInstance(decade, db.decade.Decade)
+        self.assertIsInstance(decade, db.objects.Row)
+
+        self.assertEqual(decade.decade, 2020)
+        self.assertEqual(str(decade), "2020s")
+
+        with self.assertRaises(sqlite3.IntegrityError):
+            db.decade.Table.insert(2020)
+
+    def test_decade_table_delete(self):
+        decade = db.decade.Table.find(2020)
+        db.decade.Table.delete(decade)
+        self.assertIsNone(db.decade.Table.lookup(2020))
+
+    def test_decade_table_get(self):
+        decade = db.decade.Table.insert(2020)
+        self.assertEqual(db.decade.Table.get(1), decade)
+        self.assertIsNone(db.decade.Table.get(2))
+
+    def test_decade_table_lookup(self):
+        decade = db.decade.Table.insert(2020)
+        self.assertEqual(db.decade.Table.lookup(2020), decade)
+        self.assertIsNone(db.decade.Table.lookup(2021))
+
+    def test_decade_compare(self):
+        d2010 = db.decade.Table.insert(2010)
+        d2020 = db.decade.Table.insert(2020)
+
+        self.assertTrue(d2010 < d2020)
+        self.assertTrue(d2020 > d2010)
+
+        self.assertFalse(d2010 > d2020)
+        self.assertFalse(d2020 < d2010)