Schema diff — compare two SchemaSnapshots and produce Operations.
data.schema.diff
| Name | Type | Default | Description |
|---|---|---|---|
type
|
|
— | |
qualified_name
|
|
— | |
element_type
|
|
— | |
description
|
|
— | |
source_file
|
|
— | |
line_number
|
|
— | |
is_autodoc
|
|
— | |
autodoc_element
|
|
— | |
_autodoc_template
|
|
— | |
_autodoc_url_path
|
|
— | |
_autodoc_page_type
|
|
— | |
title
|
|
— | |
doc_content_hash
|
|
— |
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Normalize a column type for comparison across introspect vs parse.
Strips length/precision (VARCHAR(255) -> VARCHAR) and maps known backend aliases to a…
Compare current and desired schemas, returning operations to migrate.
Operations are ordered: drops first, then creates, then alters.
_canonical_type
function
def _canonical_type(type_str: str) -> strNormalize a column type for comparison across introspect vs parse.
Strips length/precision (VARCHAR(255) -> VARCHAR) and maps known
backend aliases to a shared canonical name so an in-sync schema does not
register a spurious type change.
Parameters
| Name | Type | Default | Description |
|---|---|---|---|
type_str
|
str
|
— |
diff_schemas
function
def diff_schemas(current: SchemaSnapshot, desired: SchemaSnapshot) -> list[Operation]Compare current and desired schemas, returning operations to migrate.
Operations are ordered: drops first, then creates, then alters.
Parameters
| Name | Type | Default | Description |
|---|---|---|---|
current
|
SchemaSnapshot
|
— | |
desired
|
SchemaSnapshot
|
— |
View source · /home/runner/work/chirp/chirp/site/../src/chirp/data/schema/diff.py:1