Models and migrations for requests

alembic/README

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+Generic single-database configuration.

alembic/env.py

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+from __future__ import with_statement
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+from logging.config import fileConfig
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+target_metadata = None
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+import sys
+from unipath import Path
+
+parent_dir = Path(__file__).parent.parent
+sys.path.append(parent_dir)
+
+from atst.app import make_config
+app_config = make_config()
+config.set_main_option('sqlalchemy.url', app_config['default']['DATABASE_URI'])
+
+from atst.database import make_db
+from atst.models import *
+db = make_db(app_config)
+target_metadata = Base.metadata
+
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url, target_metadata=target_metadata, literal_binds=True)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix='sqlalchemy.',
+        poolclass=pool.NullPool)
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

alembic/script.py.mako

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+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

alembic/versions/b5b17d465166_requests.py

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+"""requests
+
+Revision ID: b5b17d465166
+Revises: ff1c9c02fa61
+Create Date: 2018-07-23 14:58:05.044456
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = 'b5b17d465166'
+down_revision = 'ff1c9c02fa61'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('requests',
+    sa.Column('id', postgresql.UUID(as_uuid=True), server_default=sa.text('uuid_generate_v4()'), nullable=False),
+    sa.Column('creator', postgresql.UUID(as_uuid=True), nullable=True),
+    sa.Column('time_created', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=True),
+    sa.Column('body', postgresql.JSONB(astext_type=sa.Text()), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_table('request_status_events',
+    sa.Column('id', postgresql.UUID(as_uuid=True), server_default=sa.text('uuid_generate_v4()'), nullable=False),
+    sa.Column('new_status', sa.String(), nullable=True),
+    sa.Column('time_created', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=True),
+    sa.Column('request_id', postgresql.UUID(as_uuid=True), nullable=True),
+    sa.Column('sequence', sa.BigInteger(), nullable=False),
+    sa.ForeignKeyConstraint(['request_id'], ['requests.id'], ondelete='CASCADE'),
+    sa.PrimaryKeyConstraint('id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('request_status_events')
+    op.drop_table('requests')
+    # ### end Alembic commands ###

alembic/versions/ff1c9c02fa61_enable_uuid_extension.py

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+"""enable uuid extension
+
+Revision ID: ff1c9c02fa61
+Revises:
+Create Date: 2018-07-23 14:54:05.422286
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'ff1c9c02fa61'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    connection = op.get_bind()
+    connection.execute('CREATE EXTENSION IF NOT EXISTS "uuid-ossp"')
+
+
+def downgrade():
+    connection = op.get_bind()
+    connection.execute('DROP EXTENSION IF EXISTS "uuid-ossp"')