Lana

app/__init__.py

@@ -1,7 +1,22 @@
 from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+from flask_migrate import Migrate
 
+db = SQLAlchemy()
+migrate = Migrate()
 
 def create_app(test_config=None):
     app = Flask(__name__)
 
+    app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+    app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql+psycopg2://postgres:postgres@localhost:5432/solar_system_dev'
+
+    db.init_app(app)
+    migrate.init_app(app, db)
+
+    from app.models.planet import Planet
+
+    from .routes.routes import planets_bp
+    app.register_blueprint(planets_bp)
+
     return app

app/models/planet.py

@@ -0,0 +1,7 @@
+from app import db
+
+class Planet(db.Model):
+    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
+    name = db.Column(db.String)
+    description = db.Column(db.String)
+    revolution_period = db.Column(db.String)

app/routes/routes.py

@@ -0,0 +1,139 @@
+from os import abort
+from app import db
+from app.models.planet import Planet
+from flask import Blueprint, jsonify, abort, make_response, request
+
+planets_bp = Blueprint("planets_bp", __name__, url_prefix="/planets")
+
+#Error Handling an invalid planet or non-existing planet
+def validate_planet(planet_id):
+    try:
+        planet_id = int(planet_id)
+    except:
+        abort(make_response({"message":f"planet {planet_id} invalid"}, 400))
+
+    planet = Planet.query.get(planet_id)
+
+    if not planet:
+        abort(make_response({"message":f"planet {planet_id} not found"}, 404))
+
+    return planet
+
+#Create a new Planet
+@planets_bp.route("", methods=["POST"])
+def create_planet():
+    request_body = request.get_json()
+    new_planet = Planet(name=request_body["name"],
+                    description=request_body["description"],
+                    revolution_period=request_body["revolution_period"]
+                    )
+
+    db.session.add(new_planet)
+    db.session.commit()
+
+    return make_response(f"Planet {new_planet.name} successfully created", 201)
+
+
+# @planets_bp.route("", methods=["GET"])
+# def read_all_planets():
+#     planets_response = []
+#     planets = Planet.query.all()
+#     for planet in planets:
+#         planets_response.append(
+#             {
+#                 "id": planet.id,
+#                 "name": planet.name,
+#                 "description": planet.description,
+#                 "revolution_period": planet.revolution_period
+#             }
+#         )
+#     return jsonify(planets_response)
+
+
+# --------------------- Refactoring read_all query to take query params ----------------------------
+@planets_bp.route("", methods=["GET"])
+def read_all_planets():
+    # this code replaces the previous (read_all_planets)query all code
+    # refactoring to stack queries
+
+    planet_query = Planet.query #use variable to stack on queries
+
+    name_query = request.args.get("name")
+    if name_query:
+        planet_query = planet_query.filter(Planet.name.ilike(f"%{name_query}%"))
+
+    description_query = request.args.get("description")
+    if description_query:
+        planet_query = planet_query.filter(Planet.description.ilike(f"%{description_query}%"))
+
+    planets = planet_query.all()
+
+
+    planets_response = []
+    for planet in planets:
+        planets_response.append({
+            "id": planet.id,
+            "name": planet.name,
+            "description": planet.description,
+            "revolution_period": planet.revolution_period
+        })
+
+    return jsonify(planets_response)
+
+
+#Get a Single(specific) planet endpoint
+@planets_bp.route("/<planet_id>", methods=["GET"])
+def read_one_planet(planet_id):
+    planet = validate_planet(planet_id)
+
+    return {
+        "id": planet.id,
+        "name": planet.name,
+        "description": planet.description,
+        "revolution_period": planet.revolution_period
+    }
+
+#Updating a Planet (endpoint)
+@planets_bp.route("/<planet_id>", methods=["PUT"])
+def update_planet(planet_id):
+    planet = validate_planet(planet_id)
+
+    request_body = request.get_json()
+
+    planet.name = request_body["name"]
+    planet.description = request_body["description"]
+    planet.revolution_period = request_body["revolution_period"]
+
+    db.session.commit()
+
+    return make_response(f"Planet #{planet.id} successfully updated")
+
+#Deleting a Planet (endpoint)
+@planets_bp.route("/<planet_id>", methods=["DELETE"])
+def delete_planet(planet_id):
+    planet = validate_planet(planet_id)
+
+    db.session.delete(planet)
+    db.session.commit()
+
+    return make_response(f"planet #{planet.id} successfully deleted")
+
+
+# class Planet:
+#     def __init__(self, id, name, description, revolution_period):
+#        self.id = id
+#        self.name = name 
+#        self.description = description
+#        self.revolution_period = revolution_period
+
+# PLANETS = [
+#     Planet(1, "Mercury", "terrestrial", "87.97 days"),
+#     Planet(2, "Venus", "terrestrial", "224.7 days"),
+#     Planet(3, "Earth", "terrestrial", "365.26 days"),
+#     Planet(4, "Mars", "terrestrial", "1.88 years"),
+#     Planet(5, "Jupiter", "gaseous", "11.86 years"),
+#     Planet(6, "Saturn", "gaseous", "29.46 years"),
+#     Planet(7, "Uranus", "gaseous", "84.01 years"),
+#     Planet(8, "Neptune", "gaseous", "164.79 years"),
+#     Planet(9, "Pluto", "icy, rocky", "248.59 years")
+# ]

migrations/README

@@ -0,0 +1 @@
+Generic single-database configuration.

migrations/alembic.ini

@@ -0,0 +1,45 @@
+# 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

migrations/env.py

@@ -0,0 +1,96 @@
+from __future__ import with_statement
+
+import logging
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+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.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()

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/303fc3f68f6d_adds_planet_model.py

@@ -0,0 +1,34 @@
+"""adds Planet model
+
+Revision ID: 303fc3f68f6d
+Revises: 
+Create Date: 2022-11-01 13:25:16.340571
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '303fc3f68f6d'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('planet',
+    sa.Column('id', sa.Integer(), autoincrement=True, nullable=False),
+    sa.Column('name', sa.String(), nullable=True),
+    sa.Column('description', sa.String(), nullable=True),
+    sa.Column('revolution_period', sa.String(), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('planet')
+    # ### end Alembic commands ###