complete Assignment

Pipfile

@@ -12,6 +12,7 @@ importlib-metadata = "6.0.0"
 importlib-resources = "5.10.0"
 ipdb = "0.13.9"
 pytest = "7.1.3"
+sqlalchemy = "==1.4"
 
 [requires]
-python_full_version = "3.8.13"
+python_full_version = "3.10"

migrations/README

@@ -0,0 +1 @@
+Single-database configuration for Flask.

migrations/alembic.ini

@@ -0,0 +1,50 @@
+# 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,flask_migrate
+
+[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
+
+[logger_flask_migrate]
+level = INFO
+handlers =
+qualname = flask_migrate
+
+[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

migrations/env.py

@@ -0,0 +1,91 @@
+from __future__ import with_statement
+
+import logging
+from logging.config import fileConfig
+
+from flask import current_app
+
+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
+config.set_main_option(
+    'sqlalchemy.url',
+    str(current_app.extensions['migrate'].db.get_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 = current_app.extensions['migrate'].db.get_engine()
+
+    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()

migrations/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():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

migrations/versions/5912c9d88958_initial_revision.py

@@ -0,0 +1,47 @@
+"""Initial Revision
+
+Revision ID: 5912c9d88958
+Revises: 
+Create Date: 2023-09-11 09:35:24.945410
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '5912c9d88958'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('authors',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('name', sa.String(), nullable=False),
+    sa.Column('phone_number', sa.String(), nullable=True),
+    sa.Column('created_at', sa.DateTime(), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+    sa.Column('updated_at', sa.DateTime(), nullable=True),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('name')
+    )
+    op.create_table('posts',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('title', sa.String(), nullable=False),
+    sa.Column('content', sa.String(), nullable=True),
+    sa.Column('category', sa.String(), nullable=True),
+    sa.Column('summary', sa.String(), nullable=True),
+    sa.Column('created_at', sa.DateTime(), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+    sa.Column('updated_at', sa.DateTime(), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('posts')
+    op.drop_table('authors')
+    # ### end Alembic commands ###

server/models.py

@@ -1,5 +1,8 @@
 from flask_sqlalchemy import SQLAlchemy
 from sqlalchemy.orm import validates
+from sqlalchemy.exc import IntegrityError, CompileError
+
+
 db = SQLAlchemy()
 
 class Author(db.Model):
@@ -12,6 +15,22 @@ class Author(db.Model):
     created_at = db.Column(db.DateTime, server_default=db.func.now())
     updated_at = db.Column(db.DateTime, onupdate=db.func.now())
 
+    @validates('name')
+    def validate_name(cls, key, name):
+        existing_name = Author.query.filter_by(name=name).first()
+        if not name:
+            raise ValueError("Name must be added")
+        if existing_name:
+            raise IntegrityError("Name already exists in the Database")
+        return name
+
+    @validates('phone_number')
+    def validate_phone(cls, key, phone_number):
+        if 10 < len(phone_number) > 10:
+            raise ValueError("Phone number must be 10 digits")
+        return phone_number
+
+
     def __repr__(self):
         return f'Author(id={self.id}, name={self.name})'
 
@@ -27,6 +46,33 @@ class Post(db.Model):
     created_at = db.Column(db.DateTime, server_default=db.func.now())
     updated_at = db.Column(db.DateTime, onupdate=db.func.now())
 
+    @validates('title')
+    def validate_title(cls, key, title):
+        if not title:
+            raise ValueError("Title must be added")
+        if "Won't Believe" not in title or "Secret" not in title or "Top" not in title or "Guess" not in title:
+            raise ValueError("Not ClickBaitable")
+        return title
+
+    @validates('content')
+    def validate_content(cls, key, content):
+        if len(content) < 250 :
+            raise ValueError("The content Length Must be greater than 250 characters")
+        return content
+
+    @validates('summary')
+    def validate_summary(cls, key, summary):
+        if len(summary) > 250:
+            raise ValueError("The content Length Should be Less than 250 characters")
+        return summary
+
+    @validates('category')
+    def validate_category(cls, key, category):
+        if category!='Fiction' and category!='Non-Fiction':
+            raise ValueError('The Values are not Valid')
+        return category
+
+
 
     def __repr__(self):
         return f'Post(id={self.id}, title={self.title} content={self.content}, summary={self.summary})'