begin switching to sqlalchemy for database management

Pipfile

@@ -10,6 +10,7 @@ discord = "~=1.0.1"
 aiosqlite = "~=0.16.1"
 pytest = "*"
 pytest-asyncio = "*"
+sqlalchemy = "*"
 
 [requires]
 python_version = "3.7"

bot/models.py

@@ -0,0 +1,69 @@
+import datetime
+import enum
+
+from sqlalchemy import Text, Integer, Column, ForeignKey, DateTime, Enum, Boolean
+from sqlalchemy.dialects.sqlite import JSON
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import relationship
+
+Base = declarative_base()
+
+
+class PeriodStates(enum.Enum):
+    """
+    A enum representing the possible states of on-going period.
+
+    READY: Initial starting of the period. Submission channel is locked, no messages or reactions allowed.
+    SUBMISSIONS: Submission channel is open, no reactions, messages with images only.
+    PAUSED: Submission channel is locked again, no messages nor reactions.
+    VOTING: Submission channel is open to reactions (voting) only. Vote reactions are added at this stage by the bot.
+    FINISHED: Submission channel is locked again and final results are tallied.
+    """
+    READY = 0
+    SUBMISSIONS = 1
+    PAUSED = 2
+    VOTING = 3
+    FINISHED = 4
+
+
+class Guild(Base):
+    """Represents a Discord Guild the bot is in."""
+    __tablename__ = 'guild'
+
+    id = Column(Integer, primary_key=True)  # Doubles as the ID this Guild has in Discord
+    prefix = Column(Text, default='$')  # The command prefix used by this particular guild.
+    submission_channel = Column(Integer, nullable=True)  # The channel being scanned for messages by this particular guild.
+    submissions = relationship("Submission", back_populates="guild")
+    period = Column(Integer, ForeignKey('period.id'))  # The
+    active = Column(Boolean, default=True)  # Whether or not the bot is active inside the given Guild. Used for better querying.
+    joined = Column(DateTime, default=datetime.datetime.utcnow)  # The initial join time for this bot to a particular Discord.
+    last_joined = Column(DateTime, nullable=True)  # The last time the bot joined this server.
+
+
+class Submission(Base):
+    """Represents a Message the bot has seen and remembered as a valid active submission."""
+    __tablename__ = 'submission'
+
+    id = Column(Integer, primary_key=True)  # Doubles as the ID this Guild has in Discord
+    user = Column(Integer)  # The ID of the user who submitted it.
+    guild_id = Column(Integer, ForeignKey("guild.id"))  # The ID of the Guild this submission is in.
+    guild = relationship("Guild", back_populates="guild")  # The database Guild this Submission relates to.
+    timestamp = Column(DateTime)  # When the Submission was posted
+
+    period_id = Column(Integer, ForeignKey("period.id"))  # The id of the period this Submission relates to.
+    period = relationship("Period", back_populates="period")  # The period this submission was made in.
+
+
+class Period(Base):
+    """Represents a particular period of submissions and voting for a given"""
+    __tablename__ = "period"
+
+    id = Column(Integer, primary_key=True)
+    state = Column(Enum(PeriodStates))  # The current state of the period.
+    submissions = Column(JSON, nullable=True)  # A simple JSON array representing
+
+    start_time = Column(DateTime, default=datetime.datetime.utcnow())  # When this period was created/started (Ready state).
+    submissions_time = Column(DateTime, nullable=True)  # When this period switched to the Submissions state.
+    paused_time = Column(DateTime, nullable=True)  # When this period switched to the Paused state.
+    voting_time = Column(DateTime, nullable=True)  # When this period switched to the Voting state.
+    finished_time = Column(DateTime, nullable=True)  # When this period switched to the Finished state.