config.py

import os


class Config(object):
    """
    Common configurations
    """

    DEBUG = False
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    SECRET_KEY = os.environ.get('SECRET_KEY')
    FLASKY_POSTS_PER_PAGE = 4


class DevelopmentConfig(Config):
    """
    Development configurations
    """

    SQLALCHEMY_DATABASE_URI = os.environ.get('DB_URL')
    DEBUG = True
    SQLALCHEMY_ECHO = True


class TestingConfig(Config):
    """Configurations for Testing, with a separate test database."""
    TESTING = True
    SQLALCHEMY_DATABASE_URI = os.environ.get('TESTDB')


class ProductionConfig(Config):
    """
    Production configurations
    """
    DEBUG = False
    SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL')


app_config = {
    'development': DevelopmentConfig,
    'testing': TestingConfig,
    'production': ProductionConfig
}