chore: Small improvements in database structure

app/migrations/versions/50fa8edaaf94_added_user_model.py

@@ -0,0 +1,42 @@
+"""Added user model
+
+Revision ID: 50fa8edaaf94
+Revises: 
+Create Date: 2024-03-21 18:31:15.864426
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '50fa8edaaf94'
+down_revision: Union[str, None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('users',
+    sa.Column('telegram_id', sa.BigInteger(), nullable=False),
+    sa.Column('username', sa.String(length=20), nullable=False),
+    sa.Column('age', sa.SmallInteger(), nullable=False),
+    sa.Column('bio', sa.String(length=100), nullable=True),
+    sa.Column('sex', sa.String(length=6), nullable=True),
+    sa.Column('country', sa.Text(), nullable=False),
+    sa.Column('city', sa.Text(), nullable=False),
+    sa.PrimaryKeyConstraint('telegram_id'),
+    sa.UniqueConstraint('username')
+    )
+    op.create_index(op.f('ix_users_telegram_id'), 'users', ['telegram_id'], unique=False)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_users_telegram_id'), table_name='users')
+    op.drop_table('users')
+    # ### end Alembic commands ###

app/migrations/versions/5896f08fbd61_added_user_model.py

@@ -1,42 +0,0 @@
-"""Added User model
-
-Revision ID: 5896f08fbd61
-Revises: 
-Create Date: 2024-03-19 23:25:50.458639
-
-"""
-
-from typing import Sequence, Union
-
-from alembic import op
-import sqlalchemy as sa
-
-
-# revision identifiers, used by Alembic.
-revision: str = '5896f08fbd61'
-down_revision: Union[str, None] = None
-branch_labels: Union[str, Sequence[str], None] = None
-depends_on: Union[str, Sequence[str], None] = None
-
-
-def upgrade() -> None:
-    # ### commands auto generated by Alembic - please adjust! ###
-    op.create_table(
-        'users',
-        sa.Column('telegram_id', sa.Integer(), nullable=False),
-        sa.Column('username', sa.String(length=20), nullable=False),
-        sa.Column('age', sa.SmallInteger(), nullable=False),
-        sa.Column('bio', sa.String(length=100), nullable=True),
-        sa.Column('sex', sa.String(length=6), nullable=True),
-        sa.Column('country', sa.Text(), nullable=False),
-        sa.Column('city', sa.Text(), nullable=False),
-        sa.PrimaryKeyConstraint('telegram_id'),
-        sa.UniqueConstraint('username'),
-    )
-    # ### end Alembic commands ###
-
-
-def downgrade() -> None:
-    # ### commands auto generated by Alembic - please adjust! ###
-    op.drop_table('users')
-    # ### end Alembic commands ###

app/models/user.py

@@ -17,7 +17,7 @@ Base: Any = declarative_base()
 class User(Base):
     __tablename__ = "users"
 
-    telegram_id = sa.Column(sa.Integer, primary_key=True)
+    telegram_id = sa.Column(sa.BigInteger, primary_key=True, index=True)
     username = sa.Column(sa.String(20), nullable=False, unique=True)
     age = sa.Column(sa.SmallInteger, nullable=False)
     bio = sa.Column(sa.String(100), nullable=True)
@@ -35,6 +35,9 @@ class User(Base):
             re.match(regex_pattern, value) is not None
         ), "a-z, A-Z, 0-9, _ only allowed in username."
 
+        if session.query(User).filter(User.username == value).first():
+            raise AssertionError("Username is already taken.")
+
         return value
 
     @validates("age")
@@ -53,6 +56,15 @@ class User(Base):
 
         return value
 
+    @validates("sex")
+    def validate_sex(self, key, value):
+        assert value in [
+            "male",
+            "female",
+        ], "Invalid input. Please try again."
+
+        return value
+
     @validates("country")
     def validate_country(self, key, value):
         verdict, normalized_value = geo.validate_country(