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Form versioning service for schema snapshots and validation
"""
from sqlalchemy.orm import Session
from typing import Optional, Dict, Any
from datetime import datetime
import json
from ..models import Form, FormQuestion, FormVersion, ConditionalRule
class FormVersionService:
"""Service for managing form versions"""
def create_version(
self,
db: Session,
form_id: int
) -> FormVersion:
"""
Create a snapshot of current form structure.
Args:
db: Database session
form_id: ID of the form to snapshot
Returns:
FormVersion object
"""
# Fetch form with all related data
form = db.query(Form).filter(Form.id == form_id).first()
if not form:
raise ValueError(f"Form {form_id} not found")
# Get the next version number
latest_version = db.query(FormVersion).filter(
FormVersion.form_id == form_id
).order_by(FormVersion.version.desc()).first()
next_version = (latest_version.version + 1) if latest_version else 1
# Build schema snapshot
schema_snapshot = {
"form_id": form.id,
"title": form.title,
"description": form.description,
"settings": form.settings,
"questions": [],
"conditional_rules": [],
"snapshot_timestamp": datetime.utcnow().isoformat()
}
# Add questions
for question in sorted(form.questions, key=lambda q: q.question_order):
schema_snapshot["questions"].append({
"id": question.id,
"question_order": question.question_order,
"question_type": question.question_type.value,
"question_text": question.question_text,
"description": question.description,
"required": question.required,
"settings": question.settings
})
# Add conditional rules
for rule in form.conditional_rules:
schema_snapshot["conditional_rules"].append({
"id": rule.id,
"trigger_question_id": rule.trigger_question_id,
"target_question_id": rule.target_question_id,
"condition_type": rule.condition_type.value,
"condition_value": rule.condition_value,
"action": rule.action
})
# Deactivate previous active versions
db.query(FormVersion).filter(
FormVersion.form_id == form_id,
FormVersion.is_active == True
).update({"is_active": False})
# Create new version
new_version = FormVersion(
form_id=form_id,
version=next_version,
schema_snapshot=schema_snapshot,
is_active=True
)
db.add(new_version)
db.commit()
db.refresh(new_version)
return new_version
def get_active_version(
self,
db: Session,
form_id: int
) -> Optional[FormVersion]:
"""
Get the current active version for validation.
Args:
db: Database session
form_id: ID of the form
Returns:
FormVersion object or None
"""
return db.query(FormVersion).filter(
FormVersion.form_id == form_id,
FormVersion.is_active == True
).first()
def get_version_by_number(
self,
db: Session,
form_id: int,
version: int
) -> Optional[FormVersion]:
"""
Get a specific version by number.
Args:
db: Database session
form_id: ID of the form
version: Version number
Returns:
FormVersion object or None
"""
return db.query(FormVersion).filter(
FormVersion.form_id == form_id,
FormVersion.version == version
).first()
def should_create_version(
self,
db: Session,
form_id: int
) -> bool:
"""
Check if a new version should be created.
Creates version on:
- Form first published (no versions exist)
- Any question added/removed/reordered
- Any question type or settings changed
Args:
db: Database session
form_id: ID of the form
Returns:
True if new version should be created
"""
# If no versions exist, should create
version_count = db.query(FormVersion).filter(
FormVersion.form_id == form_id
).count()
if version_count == 0:
return True
# Get latest version and compare with current form
latest_version = db.query(FormVersion).filter(
FormVersion.form_id == form_id
).order_by(FormVersion.version.desc()).first()
if not latest_version:
return True
# Get current form state
form = db.query(Form).filter(Form.id == form_id).first()
if not form:
return False
# Compare question counts
current_question_count = len(form.questions)
snapshot_question_count = len(latest_version.schema_snapshot.get("questions", []))
if current_question_count != snapshot_question_count:
return True
# Compare question IDs and order (shallow check)
snapshot_question_ids = [
q["id"] for q in latest_version.schema_snapshot.get("questions", [])
]
current_question_ids = [
q.id for q in sorted(form.questions, key=lambda x: x.question_order)
]
if snapshot_question_ids != current_question_ids:
return True
# If we get here, no significant changes detected
return False
# Singleton instance
version_service = FormVersionService()
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