Add loop for updating guild data.

cogs/loops/__init__.py

@@ -5,6 +5,7 @@ Initializing code for all loops.
 from nextcord.ext import commands
 
 from .bot_presence import BotPresence
+from .guild_data import GuildData
 
 
 # This function will be called when this extension is loaded.
@@ -12,3 +13,4 @@ from .bot_presence import BotPresence
 def setup(bot: commands.Bot):
     """Adds function to bot"""
     bot.add_cog(BotPresence(bot))
+    bot.add_cog(GuildData(bot))

cogs/loops/guild_data.py

@@ -0,0 +1,48 @@
+"""
+Contains a loop that updates guild data in the database periodically.
+"""
+
+from nextcord.ext import commands, tasks
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+# pylint: disable=import-error
+from utilities.sql_data_classes import Guild, engine
+
+
+class GuildData(commands.Cog, name="Guild Data"):
+    """Class to contain loop."""
+
+    def __init__(self, bot: commands.bot) -> None:
+        self.bot = bot
+
+    @commands.Cog.listener()
+    async def on_ready(self):
+        """Starts the loop when bot is ready."""
+        await self.bot.wait_until_ready()
+        # pylint doesn't recognize that periodic_update_guild_data is subclassed from tasks.loop.
+        await self.periodic_update_guild_data.start()  # pylint: disable=no-member
+
+    @tasks.loop(hours=24)
+    async def periodic_update_guild_data(self):
+        """Loops every day, calls update_guild_data."""
+        self.update_guild_data()
+
+    def update_guild_data(self):
+        """
+        Updates all known guild's data in the database.
+        """
+        with Session(engine) as session:
+            for guild in self.bot.guilds:
+                # update given guild name for guild id
+                stmt = select(Guild).where(Guild.GuildId == guild.id)
+                g = session.scalar(stmt)
+
+                # just in case checking if the guild doesn't exist.
+                if g is None:
+                    new_guild = Guild(GuildId=guild.id, GuildName=guild.name)
+                    session.add(new_guild)
+                else:
+                    g.GuildName = guild.name
+
+                session.commit()