diff --git a/__pycache__/models.cpython-38.pyc b/__pycache__/models.cpython-38.pyc new file mode 100644 index 000000000..efe2c48dc Binary files /dev/null and b/__pycache__/models.cpython-38.pyc differ diff --git a/alembic.ini b/alembic.ini new file mode 100644 index 000000000..8d9a44241 --- /dev/null +++ b/alembic.ini @@ -0,0 +1,107 @@ +# A generic, single database configuration. + +[alembic] +# path to migration scripts +script_location = alembic + +# template used to generate migration file names; The default value is %%(rev)s_%%(slug)s +# Uncomment the line below if you want the files to be prepended with date and time +# see https://alembic.sqlalchemy.org/en/latest/tutorial.html#editing-the-ini-file +# for all available tokens +# file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(hour).2d%%(minute).2d-%%(rev)s_%%(slug)s + +# sys.path path, will be prepended to sys.path if present. +# defaults to the current working directory. +prepend_sys_path = . + +# timezone to use when rendering the date within the migration file +# as well as the filename. +# If specified, requires the python-dateutil library that can be +# installed by adding `alembic[tz]` to the pip requirements +# string value is passed to dateutil.tz.gettz() +# leave blank for localtime +# timezone = + +# max length of characters to apply to the +# "slug" field +# truncate_slug_length = 40 + +# set to 'true' to run the environment during +# the 'revision' command, regardless of autogenerate +# revision_environment = false + +# set to 'true' to allow .pyc and .pyo files without +# a source .py file to be detected as revisions in the +# versions/ directory +# sourceless = false + +# version location specification; This defaults +# to alembic/versions. When using multiple version +# directories, initial revisions must be specified with --version-path. +# The path separator used here should be the separator specified by "version_path_separator" below. +# version_locations = %(here)s/bar:%(here)s/bat:alembic/versions + +# version path separator; As mentioned above, this is the character used to split +# version_locations. The default within new alembic.ini files is "os", which uses os.pathsep. +# If this key is omitted entirely, it falls back to the legacy behavior of splitting on spaces and/or commas. +# Valid values for version_path_separator are: +# +# version_path_separator = : +# version_path_separator = ; +# version_path_separator = space +version_path_separator = os # Use os.pathsep. Default configuration used for new projects. + +# the output encoding used when revision files + +# are written from script.py.mako +# output_encoding = utf-8 + + +sqlalchemy.url = sqlite:///freebies.db + + +[post_write_hooks] +# post_write_hooks defines scripts or Python functions that are run +# on newly generated revision scripts. See the documentation for further +# detail and examples + +# format using "black" - use the console_scripts runner, against the "black" entrypoint +# hooks = black +# black.type = console_scripts +# black.entrypoint = black +# black.options = -l 79 REVISION_SCRIPT_FILENAME + +# 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 diff --git a/alembic/README b/alembic/README new file mode 100644 index 000000000..98e4f9c44 --- /dev/null +++ b/alembic/README @@ -0,0 +1 @@ +Generic single-database configuration. \ No newline at end of file diff --git a/alembic/__pycache__/env.cpython-38.pyc b/alembic/__pycache__/env.cpython-38.pyc new file mode 100644 index 000000000..b33eeb893 Binary files /dev/null and b/alembic/__pycache__/env.cpython-38.pyc differ diff --git a/alembic/env.py b/alembic/env.py new file mode 100644 index 000000000..06e60fbcd --- /dev/null +++ b/alembic/env.py @@ -0,0 +1,81 @@ +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. +if config.config_file_name is not None: + 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 +from models import Base # Import your models + +target_metadata = Base.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() -> None: + """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, + dialect_opts={"paramstyle": "named"}, + ) + + with context.begin_transaction(): + context.run_migrations() + + +def run_migrations_online() -> None: + """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() diff --git a/alembic/script.py.mako b/alembic/script.py.mako new file mode 100644 index 000000000..55df2863d --- /dev/null +++ b/alembic/script.py.mako @@ -0,0 +1,24 @@ +"""${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() -> None: + ${upgrades if upgrades else "pass"} + + +def downgrade() -> None: + ${downgrades if downgrades else "pass"} diff --git a/alembic/versions/__pycache__/a9392bc9699d_create_freebies_table.cpython-38.pyc b/alembic/versions/__pycache__/a9392bc9699d_create_freebies_table.cpython-38.pyc new file mode 100644 index 000000000..2c53fbad7 Binary files /dev/null and b/alembic/versions/__pycache__/a9392bc9699d_create_freebies_table.cpython-38.pyc differ diff --git a/alembic/versions/__pycache__/d236154c1086_create_freebies_table.cpython-38.pyc b/alembic/versions/__pycache__/d236154c1086_create_freebies_table.cpython-38.pyc new file mode 100644 index 000000000..40ac30333 Binary files /dev/null and b/alembic/versions/__pycache__/d236154c1086_create_freebies_table.cpython-38.pyc differ diff --git a/alembic/versions/a9392bc9699d_create_freebies_table.py b/alembic/versions/a9392bc9699d_create_freebies_table.py new file mode 100644 index 000000000..884030d0e --- /dev/null +++ b/alembic/versions/a9392bc9699d_create_freebies_table.py @@ -0,0 +1,59 @@ +from alembic import op +import sqlalchemy as sa +from sqlalchemy import inspect + +# revision identifiers, used by Alembic. +revision = 'a9392bc9699d' +down_revision = None +branch_labels = None +depends_on = None + +def upgrade() -> None: + # Get the current database connection and inspector + bind = op.get_bind() + inspector = inspect(bind) + + # Check if 'companies' table already exists + if 'companies' not in inspector.get_table_names(): + op.create_table('companies', + sa.Column('id', sa.Integer(), nullable=False), + sa.Column('name', sa.String(), nullable=True), + sa.Column('founding_year', sa.Integer(), nullable=True), + sa.PrimaryKeyConstraint('id') + ) + + # Check if 'devs' table already exists + if 'devs' not in inspector.get_table_names(): + op.create_table('devs', + sa.Column('id', sa.Integer(), nullable=False), + sa.Column('name', sa.String(), nullable=True), + sa.PrimaryKeyConstraint('id') + ) + + # Check if 'freebies' table already exists + if 'freebies' not in inspector.get_table_names(): + op.create_table('freebies', + sa.Column('id', sa.Integer(), nullable=False), + sa.Column('item_name', sa.String(), nullable=True), + sa.Column('value', sa.Integer(), nullable=True), + sa.Column('company_id', sa.Integer(), nullable=True), + sa.Column('dev_id', sa.Integer(), nullable=True), + sa.ForeignKeyConstraint(['company_id'], ['companies.id']), + sa.ForeignKeyConstraint(['dev_id'], ['devs.id']), + sa.PrimaryKeyConstraint('id') + ) + +def downgrade() -> None: + # Get the current database connection and inspector + bind = op.get_bind() + inspector = inspect(bind) + + # Only drop the table if it exists + if 'freebies' in inspector.get_table_names(): + op.drop_table('freebies') + + if 'devs' in inspector.get_table_names(): + op.drop_table('devs') + + if 'companies' in inspector.get_table_names(): + op.drop_table('companies') diff --git a/alembic/versions/d236154c1086_create_freebies_table.py b/alembic/versions/d236154c1086_create_freebies_table.py new file mode 100644 index 000000000..f52b8c082 --- /dev/null +++ b/alembic/versions/d236154c1086_create_freebies_table.py @@ -0,0 +1,61 @@ +from alembic import op +import sqlalchemy as sa +from sqlalchemy import inspect + +# revision identifiers, used by Alembic. +revision = 'd236154c1086' +down_revision = 'a9392bc9699d' +branch_labels = None +depends_on = None + +def upgrade() -> None: + bind = op.get_bind() + inspector = inspect(bind) + + # Create 'company_dev' table if it doesn't exist + if 'company_dev' not in inspector.get_table_names(): + op.create_table('company_dev', + sa.Column('company_id', sa.Integer(), nullable=False), + sa.Column('dev_id', sa.Integer(), nullable=False), + sa.ForeignKeyConstraint(['company_id'], ['companies.id'], name=op.f('fk_company_dev_company_id_companies')), + sa.ForeignKeyConstraint(['dev_id'], ['devs.id'], name=op.f('fk_company_dev_dev_id_devs')), + sa.PrimaryKeyConstraint('company_id', 'dev_id') + ) + + # Workaround for SQLite: Recreate 'freebies' table with the correct constraints + op.create_table('freebies_new', + sa.Column('id', sa.Integer(), primary_key=True), + sa.Column('item_name', sa.String(), nullable=False), # Enforce NOT NULL + sa.Column('value', sa.Integer(), nullable=False), # Enforce NOT NULL + sa.Column('dev_id', sa.Integer(), sa.ForeignKey('devs.id')), + sa.Column('company_id', sa.Integer(), sa.ForeignKey('companies.id')) + ) + + # Copy data from old table + op.execute(""" + INSERT INTO freebies_new (id, item_name, value, dev_id, company_id) + SELECT id, item_name, value, dev_id, company_id FROM freebies + """) + + # Drop old table and rename new table + op.drop_table('freebies') + op.rename_table('freebies_new', 'freebies') + + +def downgrade() -> None: + # Reverse the process in downgrade + op.create_table('freebies_old', + sa.Column('id', sa.Integer(), primary_key=True), + sa.Column('item_name', sa.String(), nullable=True), # Allow NULL again + sa.Column('value', sa.Integer(), nullable=True), + sa.Column('dev_id', sa.Integer(), sa.ForeignKey('devs.id')), + sa.Column('company_id', sa.Integer(), sa.ForeignKey('companies.id')) + ) + + op.execute(""" + INSERT INTO freebies_old (id, item_name, value, dev_id, company_id) + SELECT id, item_name, value, dev_id, company_id FROM freebies + """) + + op.drop_table('freebies') + op.rename_table('freebies_old', 'freebies') diff --git a/freebies.db b/freebies.db new file mode 100644 index 000000000..aab3edf84 Binary files /dev/null and b/freebies.db differ diff --git a/lib/__pycache__/models.cpython-38.pyc b/lib/__pycache__/models.cpython-38.pyc new file mode 100644 index 000000000..61b58ace3 Binary files /dev/null and b/lib/__pycache__/models.cpython-38.pyc differ diff --git a/lib/debug.py b/lib/debug.py index 4f922eb69..f77096481 100644 --- a/lib/debug.py +++ b/lib/debug.py @@ -1,8 +1,7 @@ #!/usr/bin/env python3 from sqlalchemy import create_engine - -from models import Company, Dev +from models import session, Company, Dev, Freebie # Import session if __name__ == '__main__': engine = create_engine('sqlite:///freebies.db') diff --git a/lib/freebles.db b/lib/freebles.db new file mode 100644 index 000000000..e69de29bb diff --git a/lib/migrations/versions/5f72c58bf48c_create_companies_devs.py b/lib/migrations/versions/5f72c58bf48c_create_companies_devs.py index c191bb2f9..ce36fb28f 100644 --- a/lib/migrations/versions/5f72c58bf48c_create_companies_devs.py +++ b/lib/migrations/versions/5f72c58bf48c_create_companies_devs.py @@ -1,10 +1,3 @@ -"""create companies, devs - -Revision ID: 5f72c58bf48c -Revises: 7a71dbf71c64 -Create Date: 2023-03-15 15:06:20.944586 - -""" from alembic import op import sqlalchemy as sa @@ -18,22 +11,40 @@ def upgrade() -> None: # ### commands auto generated by Alembic - please adjust! ### - op.create_table('companies', - sa.Column('id', sa.Integer(), nullable=False), - sa.Column('name', sa.String(), nullable=True), - sa.Column('founding_year', sa.Integer(), nullable=True), - sa.PrimaryKeyConstraint('id') + + # Creating companies table + op.create_table( + 'companies', + sa.Column('id', sa.Integer(), nullable=False), + sa.Column('name', sa.String(), nullable=True), + sa.Column('founding_year', sa.Integer(), nullable=True), + sa.PrimaryKeyConstraint('id') ) - op.create_table('devs', - sa.Column('id', sa.Integer(), nullable=False), - sa.Column('name', sa.String(), nullable=True), - sa.PrimaryKeyConstraint('id') + + # Creating devs table + op.create_table( + 'devs', + sa.Column('id', sa.Integer(), nullable=False), + sa.Column('name', sa.String(), nullable=True), + sa.PrimaryKeyConstraint('id') + ) + + # Creating freebies table with constraints + op.create_table( + 'freebies', + sa.Column('id', sa.Integer(), nullable=False), + sa.Column('item_name', sa.String(), nullable=False), # Add NOT NULL constraint + sa.Column('value', sa.Integer(), nullable=False), # Add NOT NULL constraint + sa.Column('dev_id', sa.Integer(), sa.ForeignKey('devs.id')), + sa.Column('company_id', sa.Integer(), sa.ForeignKey('companies.id')), + sa.PrimaryKeyConstraint('id') ) # ### end Alembic commands ### def downgrade() -> None: # ### commands auto generated by Alembic - please adjust! ### + op.drop_table('freebies') op.drop_table('devs') op.drop_table('companies') # ### end Alembic commands ### diff --git a/lib/models.py b/lib/models.py index 2681bee5a..a1c51b609 100644 --- a/lib/models.py +++ b/lib/models.py @@ -1,14 +1,31 @@ -from sqlalchemy import ForeignKey, Column, Integer, String, MetaData -from sqlalchemy.orm import relationship, backref +from sqlalchemy import ForeignKey, Column, Integer, String, MetaData, create_engine +from sqlalchemy.orm import relationship, backref, sessionmaker from sqlalchemy.ext.declarative import declarative_base -convention = { - "fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s", -} +# Defining metadata +convention = {"fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s"} metadata = MetaData(naming_convention=convention) Base = declarative_base(metadata=metadata) +# Setting up the database engine +engine = create_engine('sqlite:///freebies.db') + +# Creating a session factory +Session = sessionmaker(bind=engine) +session = Session() + +# Association Table for Many-to-Many relationship +class CompanyDev(Base): + __tablename__ = 'company_dev' + + company_id = Column(Integer(), ForeignKey('companies.id'), primary_key=True) + dev_id = Column(Integer(), ForeignKey('devs.id'), primary_key=True) + + company = relationship('Company', backref=backref('company_devs', overlaps="devs,company_devs")) + dev = relationship('Dev', backref=backref('company_devs', overlaps="companies,company_devs")) + +# Models class Company(Base): __tablename__ = 'companies' @@ -16,6 +33,20 @@ class Company(Base): name = Column(String()) founding_year = Column(Integer()) + freebies = relationship("Freebie", backref="company") + devs = relationship("Dev", secondary="company_dev", backref=backref("company_associations", overlaps="company_devs,devs")) + + def give_freebie(self, dev, item_name, value): + """Creates a new Freebie instance associated with this company and the given dev.""" + new_freebie = Freebie(item_name=item_name, value=value, dev=dev, company=self) + session.add(new_freebie) + session.commit() + + @classmethod + def oldest_company(cls): + """Returns the company with the earliest founding year.""" + return session.query(cls).order_by(cls.founding_year).first() + def __repr__(self): return f'' @@ -23,7 +54,35 @@ class Dev(Base): __tablename__ = 'devs' id = Column(Integer(), primary_key=True) - name= Column(String()) + name = Column(String()) + + freebies = relationship("Freebie", backref="dev") + companies = relationship("Company", secondary="company_dev", backref=backref("dev_associations", overlaps="company_devs,companies")) + + def received_one(self, item_name): + """Returns True if the dev has received a freebie with the given item_name.""" + return any(freebie.item_name == item_name for freebie in self.freebies) + + def give_away(self, dev, freebie): + """Transfers a freebie to another dev if the freebie belongs to this dev.""" + if freebie in self.freebies: + freebie.dev = dev + session.commit() def __repr__(self): return f'' + +class Freebie(Base): + __tablename__ = 'freebies' + + id = Column(Integer(), primary_key=True) + item_name = Column(String(), nullable=False) + value = Column(Integer(), nullable=False) + dev_id = Column(Integer(), ForeignKey('devs.id')) + company_id = Column(Integer(), ForeignKey('companies.id')) + + def print_details(self): + return f"{self.dev.name} owns a {self.item_name} from {self.company.name}" + + def __repr__(self): + return f'' diff --git a/lib/seed.py b/lib/seed.py index b16becbbb..3b4efb0a4 100644 --- a/lib/seed.py +++ b/lib/seed.py @@ -1,3 +1,29 @@ -#!/usr/bin/env python3 +from sqlalchemy import create_engine +from sqlalchemy.orm import sessionmaker +from models import Base, Company, Dev, Freebie, CompanyDev -# Script goes here! +engine = create_engine("sqlite:///freebies.db") +Session = sessionmaker(bind=engine) +session = Session() + +# Creating sample companies +company1 = Company(name="Google", founding_year=1998) +company2 = Company(name="Microsoft", founding_year=1975) + +# Creating sample developers +dev1 = Dev(name="Alice") +dev2 = Dev(name="Bob") + +# Creating sample freebies +freebie1 = Freebie(item_name="T-Shirt", value=10, company=company1, dev=dev1) +freebie2 = Freebie(item_name="Mug", value=5, company=company2, dev=dev2) + +# Add the dev-company relationship explicitly for many-to-many +company1.devs.append(dev1) +company2.devs.append(dev2) + +# Adding all the instances to the session +session.add_all([company1, company2, dev1, dev2, freebie1, freebie2]) +session.commit() + +print("✅ Database seeded successfully!") diff --git a/migrations/README b/migrations/README new file mode 100644 index 000000000..98e4f9c44 --- /dev/null +++ b/migrations/README @@ -0,0 +1 @@ +Generic single-database configuration. \ No newline at end of file diff --git a/migrations/env.py b/migrations/env.py new file mode 100644 index 000000000..36112a3c6 --- /dev/null +++ b/migrations/env.py @@ -0,0 +1,78 @@ +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. +if config.config_file_name is not None: + 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. + + +def run_migrations_offline() -> None: + """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, + dialect_opts={"paramstyle": "named"}, + ) + + with context.begin_transaction(): + context.run_migrations() + + +def run_migrations_online() -> None: + """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() diff --git a/migrations/script.py.mako b/migrations/script.py.mako new file mode 100644 index 000000000..fbc4b07dc --- /dev/null +++ b/migrations/script.py.mako @@ -0,0 +1,26 @@ +"""${message} + +Revision ID: ${up_revision} +Revises: ${down_revision | comma,n} +Create Date: ${create_date} + +""" +from typing import Sequence, Union + +from alembic import op +import sqlalchemy as sa +${imports if imports else ""} + +# revision identifiers, used by Alembic. +revision: str = ${repr(up_revision)} +down_revision: Union[str, None] = ${repr(down_revision)} +branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)} +depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)} + + +def upgrade() -> None: + ${upgrades if upgrades else "pass"} + + +def downgrade() -> None: + ${downgrades if downgrades else "pass"} diff --git a/models.py b/models.py new file mode 100644 index 000000000..a1c51b609 --- /dev/null +++ b/models.py @@ -0,0 +1,88 @@ +from sqlalchemy import ForeignKey, Column, Integer, String, MetaData, create_engine +from sqlalchemy.orm import relationship, backref, sessionmaker +from sqlalchemy.ext.declarative import declarative_base + +# Defining metadata +convention = {"fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s"} +metadata = MetaData(naming_convention=convention) + +Base = declarative_base(metadata=metadata) + +# Setting up the database engine +engine = create_engine('sqlite:///freebies.db') + +# Creating a session factory +Session = sessionmaker(bind=engine) +session = Session() + +# Association Table for Many-to-Many relationship +class CompanyDev(Base): + __tablename__ = 'company_dev' + + company_id = Column(Integer(), ForeignKey('companies.id'), primary_key=True) + dev_id = Column(Integer(), ForeignKey('devs.id'), primary_key=True) + + company = relationship('Company', backref=backref('company_devs', overlaps="devs,company_devs")) + dev = relationship('Dev', backref=backref('company_devs', overlaps="companies,company_devs")) + +# Models +class Company(Base): + __tablename__ = 'companies' + + id = Column(Integer(), primary_key=True) + name = Column(String()) + founding_year = Column(Integer()) + + freebies = relationship("Freebie", backref="company") + devs = relationship("Dev", secondary="company_dev", backref=backref("company_associations", overlaps="company_devs,devs")) + + def give_freebie(self, dev, item_name, value): + """Creates a new Freebie instance associated with this company and the given dev.""" + new_freebie = Freebie(item_name=item_name, value=value, dev=dev, company=self) + session.add(new_freebie) + session.commit() + + @classmethod + def oldest_company(cls): + """Returns the company with the earliest founding year.""" + return session.query(cls).order_by(cls.founding_year).first() + + def __repr__(self): + return f'' + +class Dev(Base): + __tablename__ = 'devs' + + id = Column(Integer(), primary_key=True) + name = Column(String()) + + freebies = relationship("Freebie", backref="dev") + companies = relationship("Company", secondary="company_dev", backref=backref("dev_associations", overlaps="company_devs,companies")) + + def received_one(self, item_name): + """Returns True if the dev has received a freebie with the given item_name.""" + return any(freebie.item_name == item_name for freebie in self.freebies) + + def give_away(self, dev, freebie): + """Transfers a freebie to another dev if the freebie belongs to this dev.""" + if freebie in self.freebies: + freebie.dev = dev + session.commit() + + def __repr__(self): + return f'' + +class Freebie(Base): + __tablename__ = 'freebies' + + id = Column(Integer(), primary_key=True) + item_name = Column(String(), nullable=False) + value = Column(Integer(), nullable=False) + dev_id = Column(Integer(), ForeignKey('devs.id')) + company_id = Column(Integer(), ForeignKey('companies.id')) + + def print_details(self): + return f"{self.dev.name} owns a {self.item_name} from {self.company.name}" + + def __repr__(self): + return f'' diff --git a/seed.py b/seed.py new file mode 100644 index 000000000..3b4efb0a4 --- /dev/null +++ b/seed.py @@ -0,0 +1,29 @@ +from sqlalchemy import create_engine +from sqlalchemy.orm import sessionmaker +from models import Base, Company, Dev, Freebie, CompanyDev + +engine = create_engine("sqlite:///freebies.db") +Session = sessionmaker(bind=engine) +session = Session() + +# Creating sample companies +company1 = Company(name="Google", founding_year=1998) +company2 = Company(name="Microsoft", founding_year=1975) + +# Creating sample developers +dev1 = Dev(name="Alice") +dev2 = Dev(name="Bob") + +# Creating sample freebies +freebie1 = Freebie(item_name="T-Shirt", value=10, company=company1, dev=dev1) +freebie2 = Freebie(item_name="Mug", value=5, company=company2, dev=dev2) + +# Add the dev-company relationship explicitly for many-to-many +company1.devs.append(dev1) +company2.devs.append(dev2) + +# Adding all the instances to the session +session.add_all([company1, company2, dev1, dev2, freebie1, freebie2]) +session.commit() + +print("✅ Database seeded successfully!") diff --git a/your_database.db b/your_database.db new file mode 100644 index 000000000..e69de29bb