Experimenting with pydantic

2025-10-07 15:59:00 +02:00
parent 5ec47b8332
commit e5a295faba
8 changed files with 574 additions and 48 deletions
--- a/logs/push_requests/alpinebits_push_12345_c52702c9-55b9-44e1-b158-ec9544c73cc7_20251007_155426.xml
+++ b/logs/push_requests/alpinebits_push_12345_c52702c9-55b9-44e1-b158-ec9544c73cc7_20251007_155426.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<OTA_HotelResNotifRQ xmlns="http://www.opentravel.org/OTA/2003/05" Version="7.000">
+  <HotelReservations/>
+</OTA_HotelResNotifRQ>
--- a/logs/wix_test_data_20251007_155426.json
+++ b/logs/wix_test_data_20251007_155426.json
@@ -0,0 +1,257 @@
+{
+  "timestamp": "2025-10-07T15:54:26.898008",
+  "client_ip": "127.0.0.1",
+  "headers": {
+    "host": "localhost:8080",
+    "content-type": "application/json",
+    "user-agent": "insomnia/2023.5.8",
+    "accept": "*/*",
+    "content-length": "7335"
+  },
+  "data": {
+    "data": {
+      "formName": "Contact us",
+      "submissions": [
+        {
+          "label": "Anreisedatum",
+          "value": "2026-01-02"
+        },
+        {
+          "label": "Abreisedatum",
+          "value": "2026-01-07"
+        },
+        {
+          "label": "Anzahl Erwachsene",
+          "value": "3"
+        },
+        {
+          "label": "Anzahl Kinder",
+          "value": "1"
+        },
+        {
+          "label": "Alter Kind 1",
+          "value": "12"
+        },
+        {
+          "label": "Anrede",
+          "value": "Frau"
+        },
+        {
+          "label": "Vorname",
+          "value": "Genesia "
+        },
+        {
+          "label": "Nachname",
+          "value": "Supino "
+        },
+        {
+          "label": "Email",
+          "value": "supinogenesia@gmail.com"
+        },
+        {
+          "label": "Phone",
+          "value": "+39 340 625 9979"
+        },
+        {
+          "label": "Einwilligung Marketing",
+          "value": "Selezionato"
+        },
+        {
+          "label": "utm_Source",
+          "value": "fb"
+        },
+        {
+          "label": "utm_Medium",
+          "value": "Facebook_Mobile_Feed"
+        },
+        {
+          "label": "utm_Campaign",
+          "value": "Conversions_Hotel_Bemelmans_ITA"
+        },
+        {
+          "label": "utm_Term",
+          "value": "Cold_Traffic_Conversions_Hotel_Bemelmans_ITA"
+        },
+        {
+          "label": "utm_Content",
+          "value": "Grafik_AuszeitDezember_9.12_23.12"
+        },
+        {
+          "label": "utm_term_id",
+          "value": "120238574626400196"
+        },
+        {
+          "label": "utm_content_id",
+          "value": "120238574626400196"
+        },
+        {
+          "label": "gad_source",
+          "value": ""
+        },
+        {
+          "label": "gad_campaignid",
+          "value": ""
+        },
+        {
+          "label": "gbraid",
+          "value": ""
+        },
+        {
+          "label": "gclid",
+          "value": ""
+        },
+        {
+          "label": "fbclid",
+          "value": "IwZXh0bgNhZW0BMABhZGlkAassWPh1b8QBHoRc2S24gMktdNKiPwEvGYMK3rB-mne_0IJQvQRIGH60wLvLfOm0XWP8wJ9s_aem_rbpAFMODwOh4UnF5UVxwWg"
+        },
+        {
+          "label": "hotelid",
+          "value": "12345"
+        },
+        {
+          "label": "hotelname",
+          "value": "Bemelmans Post"
+        }
+      ],
+      "field:date_picker_7e65": "2026-01-07",
+      "field:number_7cf5": "3",
+      "field:utm_source": "fb",
+      "submissionTime": "2025-10-07T05:48:41.855Z",
+      "field:alter_kind_3": "12",
+      "field:gad_source": "",
+      "field:form_field_5a7b": "Selezionato",
+      "field:gad_campaignid": "",
+      "field:utm_medium": "Facebook_Mobile_Feed",
+      "field:utm_term_id": "120238574626400196",
+      "context": {
+        "metaSiteId": "1dea821c-8168-4736-96e4-4b92e8b364cf",
+        "activationId": "2421c9cd-6565-49ba-b60f-165d3dacccba"
+      },
+      "field:email_5139": "supinogenesia@gmail.com",
+      "field:phone_4c77": "+39 340 625 9979",
+      "_context": {
+        "activation": {
+          "id": "2421c9cd-6565-49ba-b60f-165d3dacccba"
+        },
+        "configuration": {
+          "id": "a976f18c-fa86-495d-be1e-676df188eeae"
+        },
+        "app": {
+          "id": "225dd912-7dea-4738-8688-4b8c6955ffc2"
+        },
+        "action": {
+          "id": "152db4d7-5263-40c4-be2b-1c81476318b7"
+        },
+        "trigger": {
+          "key": "wix_form_app-form_submitted"
+        }
+      },
+      "field:gclid": "",
+      "formFieldMask": [
+        "field:",
+        "field:",
+        "field:angebot_auswaehlen",
+        "field:date_picker_a7c8",
+        "field:date_picker_7e65",
+        "field:",
+        "field:number_7cf5",
+        "field:anzahl_kinder",
+        "field:alter_kind_3",
+        "field:alter_kind_25",
+        "field:alter_kind_4",
+        "field:alter_kind_5",
+        "field:alter_kind_6",
+        "field:alter_kind_7",
+        "field:alter_kind_8",
+        "field:alter_kind_9",
+        "field:alter_kind_10",
+        "field:alter_kind_11",
+        "field:",
+        "field:anrede",
+        "field:first_name_abae",
+        "field:last_name_d97c",
+        "field:email_5139",
+        "field:phone_4c77",
+        "field:long_answer_3524",
+        "field:form_field_5a7b",
+        "field:",
+        "field:utm_source",
+        "field:utm_medium",
+        "field:utm_campaign",
+        "field:utm_term",
+        "field:utm_content",
+        "field:utm_term_id",
+        "field:utm_content_id",
+        "field:gad_source",
+        "field:gad_campaignid",
+        "field:gbraid",
+        "field:gclid",
+        "field:fbclid",
+        "field:hotelid",
+        "field:hotelname",
+        "field:",
+        "metaSiteId"
+      ],
+      "contact": {
+        "name": {
+          "first": "Genesia",
+          "last": "Supino"
+        },
+        "email": "supinogenesia@gmail.com",
+        "locale": "it-it",
+        "phones": [
+          {
+            "tag": "UNTAGGED",
+            "formattedPhone": "+39 340 625 9979",
+            "id": "198f04fb-5b2c-4a7b-b7ea-adc150ec4212",
+            "countryCode": "IT",
+            "e164Phone": "+393406259979",
+            "primary": true,
+            "phone": "340 625 9979"
+          }
+        ],
+        "contactId": "4d695011-36c1-4480-b225-ae9c6eef9e83",
+        "emails": [
+          {
+            "id": "e09d7bab-1f11-4b5d-b3c5-32d43c1dc584",
+            "tag": "UNTAGGED",
+            "email": "supinogenesia@gmail.com",
+            "primary": true
+          }
+        ],
+        "updatedDate": "2025-10-07T05:48:44.764Z",
+        "phone": "+393406259979",
+        "createdDate": "2025-10-07T05:48:43.567Z"
+      },
+      "submissionId": "c52702c9-55b9-44e1-b158-ec9544c73cc7",
+      "field:anzahl_kinder": "1",
+      "field:first_name_abae": "Genesia ",
+      "field:utm_content_id": "120238574626400196",
+      "field:utm_campaign": "Conversions_Hotel_Bemelmans_ITA",
+      "field:utm_term": "Cold_Traffic_Conversions_Hotel_Bemelmans_ITA",
+      "contactId": "4d695011-36c1-4480-b225-ae9c6eef9e83",
+      "field:date_picker_a7c8": "2026-01-02",
+      "field:hotelname": "Bemelmans Post",
+      "field:utm_content": "Grafik_AuszeitDezember_9.12_23.12",
+      "field:last_name_d97c": "Supino ",
+      "field:hotelid": "12345",
+      "submissionsLink": "https://manage.wix.app/forms/submissions/1dea821c-8168-4736-96e4-4b92e8b364cf/e084006b-ae83-4e4d-b2f5-074118cdb3b1?d=https%3A%2F%2Fmanage.wix.com%2Fdashboard%2F1dea821c-8168-4736-96e4-4b92e8b364cf%2Fwix-forms%2Fform%2Fe084006b-ae83-4e4d-b2f5-074118cdb3b1%2Fsubmissions&s=true",
+      "field:gbraid": "",
+      "field:fbclid": "IwZXh0bgNhZW0BMABhZGlkAassWPh1b8QBHoRc2S24gMktdNKiPwEvGYMK3rB-mne_0IJQvQRIGH60wLvLfOm0XWP8wJ9s_aem_rbpAFMODwOh4UnF5UVxwWg",
+      "submissionPdf": {
+        "fileName": "c52702c9-55b9-44e1-b158-ec9544c73cc7.pdf",
+        "downloadUrl": "https://manage.wix.com/_api/form-submission-service/v4/submissions/c52702c9-55b9-44e1-b158-ec9544c73cc7/download?accessToken=JWS.eyJraWQiOiJWLVNuLWhwZSIsImFsZyI6IkhTMjU2In0.eyJkYXRhIjoie1wibWV0YVNpdGVJZFwiOlwiMWRlYTgyMWMtODE2OC00NzM2LTk2ZTQtNGI5MmU4YjM2NGNmXCJ9IiwiaWF0IjoxNzU5ODE2MTI0LCJleHAiOjE3NTk4MTY3MjR9.quBfp9UL9Ddqb2CWERXoVkh9OdmHlIBvlLAyhoXElaY"
+      },
+      "field:anrede": "Frau",
+      "formId": "e084006b-ae83-4e4d-b2f5-074118cdb3b1"
+    }
+  },
+  "origin_header": null,
+  "all_headers": {
+    "host": "localhost:8080",
+    "content-type": "application/json",
+    "user-agent": "insomnia/2023.5.8",
+    "accept": "*/*",
+    "content-length": "7335"
+  }
+}
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,6 +16,7 @@ dependencies = [
    "generateds>=2.44.3",
    "httpx>=0.28.1",
    "lxml>=6.0.1",
+    "pydantic[email]>=2.11.9",
    "pytest>=8.4.2",
    "pytest-asyncio>=1.2.0",
    "redis>=6.4.0",
--- a/src/alpine_bits_python/alpine_bits_helpers.py
+++ b/src/alpine_bits_python/alpine_bits_helpers.py
@@ -6,6 +6,9 @@ from enum import Enum
 from typing import Any

 from alpine_bits_python.db import Customer, Reservation
+from alpine_bits_python.schemas import (
+    HotelReservationIdData as HotelReservationIdDataValidated,
+)

 # Import the generated classes
 from .generated.alpinebits import (
@@ -21,12 +24,12 @@ _LOGGER = logging.getLogger(__name__)
 _LOGGER.setLevel(logging.INFO)

 # Define type aliases for the two Customer types
-NotifCustomer = OtaHotelResNotifRq.HotelReservations.HotelReservation.ResGuests.ResGuest.Profiles.ProfileInfo.Profile.Customer
-RetrieveCustomer = OtaResRetrieveRs.ReservationsList.HotelReservation.ResGuests.ResGuest.Profiles.ProfileInfo.Profile.Customer
+NotifCustomer = OtaHotelResNotifRq.HotelReservations.HotelReservation.ResGuests.ResGuest.Profiles.ProfileInfo.Profile.Customer  # noqa: E501
+RetrieveCustomer = OtaResRetrieveRs.ReservationsList.HotelReservation.ResGuests.ResGuest.Profiles.ProfileInfo.Profile.Customer  # noqa: E501

 # Define type aliases for HotelReservationId types
-NotifHotelReservationId = OtaHotelResNotifRq.HotelReservations.HotelReservation.ResGlobalInfo.HotelReservationIds.HotelReservationId
-RetrieveHotelReservationId = OtaResRetrieveRs.ReservationsList.HotelReservation.ResGlobalInfo.HotelReservationIds.HotelReservationId
+NotifHotelReservationId = OtaHotelResNotifRq.HotelReservations.HotelReservation.ResGlobalInfo.HotelReservationIds.HotelReservationId  # noqa: E501
+RetrieveHotelReservationId = OtaResRetrieveRs.ReservationsList.HotelReservation.ResGlobalInfo.HotelReservationIds.HotelReservationId  # noqa: E501

 # Define type aliases for Comments types
 NotifComments = (
@@ -326,7 +329,7 @@ class CustomerFactory:

@dataclass
 class HotelReservationIdData:
-    """Simple data class to hold hotel reservation ID information without nested type constraints."""
+    """Hold hotel reservation ID information without nested type constraints."""

    res_id_type: str  # Required field - pattern: [0-9]+
    res_id_value: None | str = None  # Max 64 characters
@@ -359,7 +362,7 @@ class HotelReservationIdFactory:
    def _create_hotel_reservation_id(
        hotel_reservation_id_class: type, data: HotelReservationIdData
    ) -> Any:
-        """Internal method to create a hotel reservation id of the specified type."""
+        """Create a hotel reservation id of the specified type."""
        return hotel_reservation_id_class(
            res_id_type=data.res_id_type,
            res_id_value=data.res_id_value,
@@ -538,7 +541,7 @@ class ResGuestFactory:
    def _create_res_guests(
        res_guests_class: type, customer_class: type, customer_data: CustomerData
    ) -> Any:
-        """Internal method to create complete ResGuests structure."""
+        """Create the complete ResGuests structure."""
        # Create the customer using the existing CustomerFactory
        customer = CustomerFactory._create_customer(customer_class, customer_data)

@@ -712,8 +715,6 @@ def _process_single_reservation(
        reservation.num_adults, children_ages, message_type
    )

-    unique_id_string = reservation.unique_id
-
    if message_type == OtaMessageType.NOTIF:
        UniqueId = NotifUniqueId
        RoomStays = NotifRoomStays
@@ -727,8 +728,15 @@ def _process_single_reservation(
    else:
        raise ValueError("Unsupported message type: %s", message_type.value)

+    unique_id_str = reservation.unique_id
+
+    # TODO MAGIC shortening
+    if len(unique_id_str) > 32:
+        # strip to first 35 chars
+        unique_id_str = unique_id_str[:32]
+
    # UniqueID
-    unique_id = UniqueId(type_value=UniqueIdType2.VALUE_14, id=unique_id_string)
+    unique_id = UniqueId(type_value=UniqueIdType2.VALUE_14, id=unique_id_str)

    # TimeSpan
    time_span = RoomStays.RoomStay.TimeSpan(
@@ -744,52 +752,37 @@ def _process_single_reservation(
    )

    res_id_source = "website"
+    klick_id = None

    if reservation.fbclid != "":
-        klick_id = reservation.fbclid
+        klick_id = str(reservation.fbclid)
        res_id_source = "meta"
    elif reservation.gclid != "":
-        klick_id = reservation.gclid
+        klick_id = str(reservation.gclid)
        res_id_source = "google"

-    # explicitly set klick_id to None otherwise an empty string will be sent
-    if klick_id in (None, "", "None"):
-        klick_id = None
-    else:  # extract string from Column object
-        klick_id = str(klick_id)
+    # Get utm_medium if available, otherwise use source
+    if reservation.utm_medium is not None and str(reservation.utm_medium) != "":
+        res_id_source = str(reservation.utm_medium)

-    hotel_res_id_data = HotelReservationIdData(
+    # Use Pydantic model for automatic validation and truncation
+    # It will automatically:
+    # - Trim whitespace
+    # - Truncate to 64 characters if needed
+    # - Convert empty strings to None
+    hotel_res_id_data_validated = HotelReservationIdDataValidated(
        res_id_type="13",
        res_id_value=klick_id,
        res_id_source=res_id_source,
        res_id_source_context="99tales",
    )

-    # explicitly set klick_id to None otherwise an empty string will be sent
-    if klick_id in (None, "", "None"):
-        klick_id = None
-    else:  # extract string from Column object
-        klick_id = str(klick_id)
-
-    utm_medium = (
-        str(reservation.utm_medium)
-        if reservation.utm_medium is not None and str(reservation.utm_medium) != ""
-        else "website"
-    )
-
-    # shorten klick_id if longer than 64 characters
-    # TODO MAGIC SHORTENING
-    if klick_id is not None and len(klick_id) > 64:
-        klick_id = klick_id[:64]
-
-    if klick_id == "":
-        klick_id = None
-
+    # Convert back to dataclass for the factory
    hotel_res_id_data = HotelReservationIdData(
-        res_id_type="13",
-        res_id_value=klick_id,
-        res_id_source=utm_medium,
-        res_id_source_context="99tales",
+        res_id_type=hotel_res_id_data_validated.res_id_type,
+        res_id_value=hotel_res_id_data_validated.res_id_value,
+        res_id_source=hotel_res_id_data_validated.res_id_source,
+        res_id_source_context=hotel_res_id_data_validated.res_id_source_context,
    )

    hotel_res_id = alpine_bits_factory.create(hotel_res_id_data, message_type)
--- a/src/alpine_bits_python/api.py
+++ b/src/alpine_bits_python/api.py
@@ -405,11 +405,6 @@ async def process_wix_form_submission(request: Request, data: dict[str, Any], db

    unique_id = data.get("submissionId", generate_unique_id())

-    # TODO MAGIC shortening
-    if len(unique_id) > 32:
-        # strip to first 35 chars
-        unique_id = unique_id[:32]
-
    # use database session

    # Save all relevant data to DB (including new fields)
--- a/src/alpine_bits_python/schemas.py
+++ b/src/alpine_bits_python/schemas.py
@@ -0,0 +1,247 @@
+"""Pydantic models for data validation in AlpineBits.
+
+These models provide validation for data before it's passed to:
+- SQLAlchemy database models
+- AlpineBits XML generation
+- API endpoints
+
+Separating validation (Pydantic) from persistence (SQLAlchemy) and
+from XML generation (xsdata) follows clean architecture principles.
+"""
+
+from datetime import date
+
+from pydantic import BaseModel, EmailStr, Field, field_validator, model_validator
+
+
+class PhoneNumber(BaseModel):
+    """Phone number with optional type."""
+
+    number: str = Field(..., min_length=1, max_length=50, pattern=r"^\+?[0-9\s\-()]+$")
+    tech_type: str | None = Field(None, pattern="^[135]$")  # 1=voice, 3=fax, 5=mobile
+
+    @field_validator("number")
+    @classmethod
+    def clean_phone_number(cls, v: str) -> str:
+        """Remove extra spaces from phone number."""
+        return " ".join(v.split())
+
+
+class CustomerData(BaseModel):
+    """Validated customer data for creating reservations and guests."""
+
+    given_name: str = Field(..., min_length=1, max_length=100)
+    surname: str = Field(..., min_length=1, max_length=100)
+    name_prefix: str | None = Field(None, max_length=20)
+    name_title: str | None = Field(None, max_length=20)
+    phone_numbers: list[PhoneNumber] = Field(default_factory=list)
+    email_address: EmailStr | None = None
+    email_newsletter: bool | None = None
+    address_line: str | None = Field(None, max_length=255)
+    city_name: str | None = Field(None, max_length=100)
+    postal_code: str | None = Field(None, max_length=20)
+    country_code: str | None = Field(
+        None, min_length=2, max_length=2, pattern="^[A-Z]{2}$"
+    )
+    address_catalog: bool | None = None
+    gender: str | None = Field(None, pattern="^(Male|Female|Unknown)$")
+    birth_date: str | None = Field(None, pattern=r"^\d{4}-\d{2}-\d{2}$")  # ISO format
+    language: str | None = Field(None, min_length=2, max_length=2, pattern="^[a-z]{2}$")
+
+    @field_validator("given_name", "surname")
+    @classmethod
+    def name_must_not_be_empty(cls, v: str) -> str:
+        """Ensure names are not just whitespace."""
+        if not v.strip():
+            raise ValueError("Name cannot be empty or whitespace")
+        return v.strip()
+
+    @field_validator("country_code")
+    @classmethod
+    def normalize_country_code(cls, v: str | None) -> str | None:
+        """Normalize country code to uppercase."""
+        return v.upper() if v else None
+
+    @field_validator("language")
+    @classmethod
+    def normalize_language(cls, v: str | None) -> str | None:
+        """Normalize language code to lowercase."""
+        return v.lower() if v else None
+
+    model_config = {"from_attributes": True}  # Allow creation from ORM models
+
+
+class HotelReservationIdData(BaseModel):
+    """Validated hotel reservation ID data."""
+
+    res_id_type: str = Field(..., pattern=r"^[0-9]+$")  # Must be numeric string
+    res_id_value: str | None = None
+    res_id_source: str | None = None
+    res_id_source_context: str | None = None
+
+    @field_validator(
+        "res_id_value", "res_id_source", "res_id_source_context", mode="before"
+    )
+    @classmethod
+    def trim_and_truncate(cls, v: str | None) -> str | None:
+        """Trim whitespace and truncate to max length if needed.
+
+        Runs BEFORE field validation to ensure values are cleaned and truncated
+        before max_length constraints are checked.
+        """
+        if not v:
+            return None
+        # Convert to string if needed
+        v = str(v)
+        # Strip whitespace
+        v = v.strip()
+        # Convert empty strings to None
+        if not v:
+            return None
+        # Truncate to 64 characters if needed
+        if len(v) > 64:
+            v = v[:64]
+        return v
+
+    model_config = {"from_attributes": True}
+
+
+class CommentListItemData(BaseModel):
+    """Validated comment list item."""
+
+    value: str = Field(..., min_length=1, max_length=1000)
+    list_item: str = Field(..., pattern=r"^[0-9]+$")  # Numeric identifier
+    language: str = Field(..., min_length=2, max_length=2, pattern=r"^[a-z]{2}$")
+
+    @field_validator("language")
+    @classmethod
+    def normalize_language(cls, v: str) -> str:
+        """Normalize language to lowercase."""
+        return v.lower()
+
+    model_config = {"from_attributes": True}
+
+
+class CommentData(BaseModel):
+    """Validated comment data."""
+
+    name: str  # Should be validated against CommentName2 enum
+    text: str | None = Field(None, max_length=4000)
+    list_items: list[CommentListItemData] = Field(default_factory=list)
+
+    @field_validator("list_items")
+    @classmethod
+    def validate_list_items(
+        cls, v: list[CommentListItemData]
+    ) -> list[CommentListItemData]:
+        """Ensure list items have unique identifiers."""
+        if v:
+            item_ids = [item.list_item for item in v]
+            if len(item_ids) != len(set(item_ids)):
+                raise ValueError("List items must have unique identifiers")
+        return v
+
+    model_config = {"from_attributes": True}
+
+
+class CommentsData(BaseModel):
+    """Validated comments collection."""
+
+    comments: list[CommentData] = Field(default_factory=list, max_length=3)
+
+    @field_validator("comments")
+    @classmethod
+    def validate_comment_count(cls, v: list[CommentData]) -> list[CommentData]:
+        """Ensure maximum 3 comments."""
+        if len(v) > 3:
+            raise ValueError("Maximum 3 comments allowed")
+        return v
+
+    model_config = {"from_attributes": True}
+
+
+class ReservationData(BaseModel):
+    """Validated reservation data."""
+
+    unique_id: str = Field(..., min_length=1, max_length=35)
+    start_date: date
+    end_date: date
+    num_adults: int = Field(..., ge=1, le=20)
+    num_children: int = Field(0, ge=0, le=10)
+    children_ages: list[int] = Field(default_factory=list)
+    hotel_code: str = Field(..., min_length=1, max_length=50)
+    hotel_name: str | None = Field(None, max_length=200)
+    offer: str | None = Field(None, max_length=500)
+    user_comment: str | None = Field(None, max_length=2000)
+    fbclid: str | None = Field(None, max_length=100)
+    gclid: str | None = Field(None, max_length=100)
+    utm_source: str | None = Field(None, max_length=100)
+    utm_medium: str | None = Field(None, max_length=100)
+    utm_campaign: str | None = Field(None, max_length=100)
+    utm_term: str | None = Field(None, max_length=100)
+    utm_content: str | None = Field(None, max_length=100)
+
+    @model_validator(mode="after")
+    def validate_dates(self) -> "ReservationData":
+        """Ensure end_date is after start_date."""
+        if self.end_date <= self.start_date:
+            raise ValueError("end_date must be after start_date")
+        return self
+
+    @model_validator(mode="after")
+    def validate_children_ages(self) -> "ReservationData":
+        """Ensure children_ages matches num_children."""
+        if len(self.children_ages) != self.num_children:
+            raise ValueError(
+                f"Number of children ages ({len(self.children_ages)}) "
+                f"must match num_children ({self.num_children})"
+            )
+        for age in self.children_ages:
+            if age < 0 or age > 17:
+                raise ValueError(f"Child age {age} must be between 0 and 17")
+        return self
+
+    @field_validator("unique_id")
+    @classmethod
+    def validate_unique_id_length(cls, v: str) -> str:
+        """Ensure unique_id doesn't exceed max length."""
+        if len(v) > 35:
+            raise ValueError(f"unique_id length {len(v)} exceeds maximum of 35")
+        return v
+
+    model_config = {"from_attributes": True}
+
+
+# Example usage in a service layer
+class ReservationService:
+    """Example service showing how to use Pydantic models with SQLAlchemy."""
+
+    def __init__(self, db_session):
+        self.db_session = db_session
+
+    async def create_reservation(
+        self, reservation_data: ReservationData, customer_data: CustomerData
+    ):
+        """Create a reservation with validated data.
+
+        The data has already been validated by Pydantic before reaching here.
+        """
+        from alpine_bits_python.db import Customer, Reservation
+
+        # Convert validated Pydantic model to SQLAlchemy model
+        db_customer = Customer(**customer_data.model_dump(exclude_none=True))
+        self.db_session.add(db_customer)
+        await self.db_session.flush()  # Get the customer ID
+
+        # Create reservation linked to customer
+        db_reservation = Reservation(
+            customer_id=db_customer.id,
+            **reservation_data.model_dump(
+                exclude={"children_ages"}
+            ),  # Handle separately
+            children_ages=",".join(map(str, reservation_data.children_ages)),
+        )
+        self.db_session.add(db_reservation)
+        await self.db_session.commit()
+
+        return db_reservation, db_customer
--- a/uv.lock
+++ b/uv.lock
@@ -26,6 +26,7 @@ dependencies = [
    { name = "generateds" },
    { name = "httpx" },
    { name = "lxml" },
+    { name = "pydantic", extra = ["email"] },
    { name = "pytest" },
    { name = "pytest-asyncio" },
    { name = "redis" },
@@ -47,6 +48,7 @@ requires-dist = [
    { name = "generateds", specifier = ">=2.44.3" },
    { name = "httpx", specifier = ">=0.28.1" },
    { name = "lxml", specifier = ">=6.0.1" },
+    { name = "pydantic", extras = ["email"], specifier = ">=2.11.9" },
    { name = "pytest", specifier = ">=8.4.2" },
    { name = "pytest-asyncio", specifier = ">=1.2.0" },
    { name = "redis", specifier = ">=6.4.0" },
@@ -206,6 +208,15 @@ wheels = [
    { url = "https://files.pythonhosted.org/packages/6e/c6/ac0b6c1e2d138f1002bcf799d330bd6d85084fece321e662a14223794041/Deprecated-1.2.18-py2.py3-none-any.whl", hash = "sha256:bd5011788200372a32418f888e326a09ff80d0214bd961147cfed01b5c018eec", size = 9998, upload-time = "2025-01-27T10:46:09.186Z" },
 ]

+[[package]]
+name = "dnspython"
+version = "2.8.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/8c/8b/57666417c0f90f08bcafa776861060426765fdb422eb10212086fb811d26/dnspython-2.8.0.tar.gz", hash = "sha256:181d3c6996452cb1189c4046c61599b84a5a86e099562ffde77d26984ff26d0f", size = 368251, upload-time = "2025-09-07T18:58:00.022Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/ba/5a/18ad964b0086c6e62e2e7500f7edc89e3faa45033c71c1893d34eed2b2de/dnspython-2.8.0-py3-none-any.whl", hash = "sha256:01d9bbc4a2d76bf0db7c1f729812ded6d912bd318d3b1cf81d30c0f845dbf3af", size = 331094, upload-time = "2025-09-07T18:57:58.071Z" },
+]
+
 [[package]]
 name = "docformatter"
 version = "1.7.7"
@@ -230,6 +241,19 @@ wheels = [
    { url = "https://files.pythonhosted.org/packages/b2/b7/545d2c10c1fc15e48653c91efde329a790f2eecfbbf2bd16003b5db2bab0/dotenv-0.9.9-py2.py3-none-any.whl", hash = "sha256:29cf74a087b31dafdb5a446b6d7e11cbce8ed2741540e2339c69fbef92c94ce9", size = 1892, upload-time = "2025-02-19T22:15:01.647Z" },
 ]

+[[package]]
+name = "email-validator"
+version = "2.3.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "dnspython" },
+    { name = "idna" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/f5/22/900cb125c76b7aaa450ce02fd727f452243f2e91a61af068b40adba60ea9/email_validator-2.3.0.tar.gz", hash = "sha256:9fc05c37f2f6cf439ff414f8fc46d917929974a82244c20eb10231ba60c54426", size = 51238, upload-time = "2025-08-26T13:09:06.831Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/de/15/545e2b6cf2e3be84bc1ed85613edd75b8aea69807a71c26f4ca6a9258e82/email_validator-2.3.0-py3-none-any.whl", hash = "sha256:80f13f623413e6b197ae73bb10bf4eb0908faf509ad8362c5edeb0be7fd450b4", size = 35604, upload-time = "2025-08-26T13:09:05.858Z" },
+]
+
 [[package]]
 name = "fastapi"
 version = "0.117.1"
@@ -508,6 +532,11 @@ wheels = [
    { url = "https://files.pythonhosted.org/packages/3e/d3/108f2006987c58e76691d5ae5d200dd3e0f532cb4e5fa3560751c3a1feba/pydantic-2.11.9-py3-none-any.whl", hash = "sha256:c42dd626f5cfc1c6950ce6205ea58c93efa406da65f479dcb4029d5934857da2", size = 444855, upload-time = "2025-09-13T11:26:36.909Z" },
 ]

+[package.optional-dependencies]
+email = [
+    { name = "email-validator" },
+]
+
 [[package]]
 name = "pydantic-core"
 version = "2.33.2"