+ database migrations

This commit is contained in:
Dmitry Belyaev 2020-07-03 14:07:07 +03:00
parent 7146fcd2fc
commit 9805d64bac
8 changed files with 250 additions and 7 deletions

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@ -4,4 +4,7 @@
<component name="PyCharmProfessionalAdvertiser">
<option name="shown" value="true" />
</component>
<component name="PythonCompatibilityInspectionAdvertiser">
<option name="version" value="3" />
</component>
</project>

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@ -1,6 +1,7 @@
import flask
from flask import Flask, request, current_app, url_for, render_template, flash, redirect
from flask_script import Manager, Shell
from flask_migrate import Migrate, MigrateCommand
from jinja2 import Template
from flask_sqlalchemy import SQLAlchemy
from datetime import datetime
@ -12,8 +13,10 @@ app.debug = True
app.config['SECRET_KEY'] = '0d6e368e-bd0c-11ea-921d-9342d47f60ca'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
app.config['SQLALCHEMY_DATABASE_URI'] = "sqlite:///db.sqlite"
manager = Manager(app)
db = SQLAlchemy(app)
migrate = Migrate(app, db)
manager = Manager(app)
manager.add_command('db', MigrateCommand)
class Category(db.Model):

1
migrations/README Normal file
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@ -0,0 +1 @@
Generic single-database configuration.

45
migrations/alembic.ini Normal file
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# A generic, single database configuration.
[alembic]
# template used to generate migration files
# file_template = %%(rev)s_%%(slug)s
# set to 'true' to run the environment during
# the 'revision' command, regardless of autogenerate
# revision_environment = false
# Logging configuration
[loggers]
keys = root,sqlalchemy,alembic
[handlers]
keys = console
[formatters]
keys = generic
[logger_root]
level = WARN
handlers = console
qualname =
[logger_sqlalchemy]
level = WARN
handlers =
qualname = sqlalchemy.engine
[logger_alembic]
level = INFO
handlers =
qualname = alembic
[handler_console]
class = StreamHandler
args = (sys.stderr,)
level = NOTSET
formatter = generic
[formatter_generic]
format = %(levelname)-5.5s [%(name)s] %(message)s
datefmt = %H:%M:%S

96
migrations/env.py Normal file
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from __future__ import with_statement
import logging
from logging.config import fileConfig
from sqlalchemy import engine_from_config
from sqlalchemy import pool
from alembic import context
# 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)
logger = logging.getLogger('alembic.env')
# add your model's MetaData object here
# for 'autogenerate' support
# from myapp import mymodel
# target_metadata = mymodel.Base.metadata
from flask import current_app
config.set_main_option(
'sqlalchemy.url',
str(current_app.extensions['migrate'].db.engine.url).replace('%', '%%'))
target_metadata = current_app.extensions['migrate'].db.metadata
# 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.
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.
"""
# this callback is used to prevent an auto-migration from being generated
# when there are no changes to the schema
# reference: http://alembic.zzzcomputing.com/en/latest/cookbook.html
def process_revision_directives(context, revision, directives):
if getattr(config.cmd_opts, 'autogenerate', False):
script = directives[0]
if script.upgrade_ops.is_empty():
directives[:] = []
logger.info('No changes in schema detected.')
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,
process_revision_directives=process_revision_directives,
**current_app.extensions['migrate'].configure_args
)
with context.begin_transaction():
context.run_migrations()
if context.is_offline_mode():
run_migrations_offline()
else:
run_migrations_online()

24
migrations/script.py.mako Normal file
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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"}

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@ -0,0 +1,70 @@
"""Initial migration
Revision ID: 60a6132e925b
Revises:
Create Date: 2020-07-03 14:02:01.302923
"""
from alembic import op
import sqlalchemy as sa
# revision identifiers, used by Alembic.
revision = '60a6132e925b'
down_revision = None
branch_labels = None
depends_on = None
def upgrade():
# ### commands auto generated by Alembic - please adjust! ###
op.create_table('categories',
sa.Column('id', sa.Integer(), nullable=False),
sa.Column('name', sa.String(length=255), nullable=False),
sa.Column('slug', sa.String(length=255), nullable=False),
sa.Column('created_on', sa.DateTime(), nullable=True),
sa.PrimaryKeyConstraint('id')
)
op.create_table('feedbacks',
sa.Column('id', sa.Integer(), nullable=False),
sa.Column('name', sa.String(length=1000), nullable=False),
sa.Column('email', sa.String(length=100), nullable=False),
sa.Column('message', sa.Text(), nullable=False),
sa.Column('created_on', sa.DateTime(), nullable=True),
sa.PrimaryKeyConstraint('id')
)
op.create_table('tags',
sa.Column('id', sa.Integer(), nullable=False),
sa.Column('name', sa.String(length=255), nullable=False),
sa.Column('slug', sa.String(length=255), nullable=False),
sa.Column('created_on', sa.DateTime(), nullable=True),
sa.PrimaryKeyConstraint('id')
)
op.create_table('posts',
sa.Column('id', sa.Integer(), nullable=False),
sa.Column('title', sa.String(length=255), nullable=False),
sa.Column('slug', sa.String(length=255), nullable=False),
sa.Column('content', sa.Text(), nullable=False),
sa.Column('created_on', sa.DateTime(), nullable=True),
sa.Column('updated_on', sa.DateTime(), nullable=True),
sa.Column('category_id', sa.Integer(), nullable=True),
sa.ForeignKeyConstraint(['category_id'], ['categories.id'], ),
sa.PrimaryKeyConstraint('id')
)
op.create_table('post_tags',
sa.Column('post_id', sa.Integer(), nullable=True),
sa.Column('tag_id', sa.Integer(), nullable=True),
sa.ForeignKeyConstraint(['post_id'], ['posts.id'], ),
sa.ForeignKeyConstraint(['tag_id'], ['tags.id'], )
)
# ### end Alembic commands ###
def downgrade():
# ### commands auto generated by Alembic - please adjust! ###
op.drop_table('post_tags')
op.drop_table('posts')
op.drop_table('tags')
op.drop_table('feedbacks')
op.drop_table('categories')
# ### end Alembic commands ###

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@ -4,3 +4,4 @@ Flask-Script==2.0.6
email_validator==1.1.1
Flask_SQLAlchemy==2.4.3
SQLAlchemy==1.3.18
flask-migrate==2.5.3