Add Organisations endpoints

As part of this we also needed to add:
- schemas for validation
- serialize method for Organisation model

app/organisation/rest.py

@@ -0,0 +1,57 @@
+from flask import Blueprint, jsonify, request
+
+from app.dao.organisation_dao import (
+    dao_create_organisation,
+    dao_get_organisations,
+    dao_get_organisation_by_id,
+    dao_update_organisation,
+)
+from app.errors import register_errors
+from app.models import Organisation
+from app.organisation.organisation_schema import (
+    post_create_organisation_schema,
+    post_update_organisation_schema,
+)
+from app.schema_validation import validate
+
+organisation_blueprint = Blueprint('organisation', __name__)
+register_errors(organisation_blueprint)
+
+
+@organisation_blueprint.route('', methods=['GET'])
+def get_organisations():
+    organisations = [
+        org.serialize() for org in dao_get_organisations()
+    ]
+
+    return jsonify(organisations)
+
+
+@organisation_blueprint.route('/<uuid:organisation_id>', methods=['GET'])
+def get_organisation_by_id(organisation_id):
+    organisation = dao_get_organisation_by_id(organisation_id)
+    return jsonify(organisation.serialize())
+
+
+@organisation_blueprint.route('', methods=['POST'])
+def create_organisation():
+    data = request.get_json()
+
+    validate(data, post_create_organisation_schema)
+
+    organisation = Organisation(**data)
+    dao_create_organisation(organisation)
+
+    return jsonify(organisation.serialize()), 201
+
+
+@organisation_blueprint.route('/<uuid:organisation_id>', methods=['POST'])
+def update_organisation(organisation_id):
+    data = request.get_json()
+
+    validate(data, post_update_organisation_schema)
+
+    fetched_organisation = dao_get_organisation_by_id(organisation_id)
+    dao_update_organisation(fetched_organisation, **data)
+
+    return jsonify(fetched_organisation.serialize()), 200