datamodel-code-generator

Issues somebody may already be working on are listed last. List everything by date

• The generated client and server read 'in' on a response Header Object

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 62/100

  datamodel-code-generator/datamodel-code-generator#5923 · Opened Nov 1, 2026

  Maintainers usually reply within 1 day

• Type alias copies of constrained types drop the parser's node records

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 50/100

  datamodel-code-generator/datamodel-code-generator#5916 · Opened Nov 1, 2026

  Maintainers usually reply within 1 day

• --reuse-model --collapse-reuse-models plans a multipart file part as a string part

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 62/100

  datamodel-code-generator/datamodel-code-generator#5915 · Opened Nov 1, 2026

  Maintainers usually reply within 1 day

• --reuse-model fails client generation when a multipart request and response body have equal schemas

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 52/100

  datamodel-code-generator/datamodel-code-generator#5910 · Opened Nov 1, 2026

  Maintainers usually reply within 1 day

• Closed and open URL-encoded response bodies are merged for dataclasses and msgspec, so the closed one silently drops unknown fields

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 4/5 3-5 days Newbie friendliness 38/100

  datamodel-code-generator/datamodel-code-generator#5908 · Opened Nov 1, 2026

  Maintainers usually reply within 1 day

• Generated client and server type a header or query parameter with a non-scalar `const` as any value and decode its parts as strings

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 4/5 3-5 days Newbie friendliness 45/100

  datamodel-code-generator/datamodel-code-generator#5907 · Opened Nov 1, 2026

  Maintainers usually reply within 1 day

• A root model kept in a merged module after --collapse-root-models keeps a constr call in its type alias

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 58/100

  datamodel-code-generator/datamodel-code-generator#5905 · Opened Nov 1, 2026

  Maintainers usually reply within 1 day

• Client generation with --reuse-model rejects parameters and form members that generate without it

  May be free again A pull request for this issue was closed without being merged. Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  datamodel-code-generator/datamodel-code-generator#5896 · Opened Nov 1, 2026

  Maintainers usually reply within 1 day

• Recommended config for an empty profile name targets a table generation does not read

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 Half a day Newbie friendliness 55/100

  datamodel-code-generator/datamodel-code-generator#5894 · Opened Nov 1, 2026

  Maintainers usually reply within 1 day

• Server parameter names reject the key of an unnamed querystring parameter

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 82/100

  datamodel-code-generator/datamodel-code-generator#5893 · Opened Nov 1, 2026

  Maintainers usually reply within 1 day

• Client/server target with --encoding utf-16 and ruff formatters crashes with RuntimeError: Ruff command failed

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 Half a day Newbie friendliness 58/100

  datamodel-code-generator/datamodel-code-generator#5892 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• AsyncAPI message traits with headers in both an inline and a referenced trait depend on their order

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 Half a day Newbie friendliness 50/100

  datamodel-code-generator/datamodel-code-generator#5884 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• The unresolved-classes error lists references in hash order

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 85/100

  datamodel-code-generator/datamodel-code-generator#5883 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• Let pytest name the stored outputs of the input-model tests, including their Pydantic 2.0 variants

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 5/5 Over a week Newbie friendliness 18/100

  datamodel-code-generator/datamodel-code-generator#5882 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• --recommend-options ends with a raw RecursionError on a YAML alias cycle in a schema

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 85/100

  datamodel-code-generator/datamodel-code-generator#5879 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• A path item whose parameters is not a list ends with a raw TypeError in the paths scope

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 85/100

  datamodel-code-generator/datamodel-code-generator#5877 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• A paths.parameters entry with a $ref fails with $ref file not found when --openapi-include-paths is used

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 75/100

  datamodel-code-generator/datamodel-code-generator#5876 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• --no-use-closed-typed-dict also drops extra='forbid' from Pydantic models for additionalProperties: false

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 65/100

  datamodel-code-generator/datamodel-code-generator#5861 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• A query or form object built by allOf gets no member plans in the client, which fails at call time for an array member

  May be free again A pull request for this issue was closed without being merged. Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 75/100

  datamodel-code-generator/datamodel-code-generator#5860 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• A multipart part declared format: binary with an enum is generated as an Enum model but planned as a file part by client and server

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 70/100

  datamodel-code-generator/datamodel-code-generator#5859 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• The model types an OpenAPI 3.1 contentMediaType binary part as str, so the generated server rejects every non-UTF-8 upload

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 4/5 3-5 days Newbie friendliness 55/100

  datamodel-code-generator/datamodel-code-generator#5858 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• A Responses Object with an x- extension key is refused by client and server generation and by the paths scope

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 75/100

  datamodel-code-generator/datamodel-code-generator#5851 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• A multipart encoding for a readOnly property is refused by client and server generation with --read-only-write-only-model-type request-response

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 82/100

  datamodel-code-generator/datamodel-code-generator#5850 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• Client and server generation disagree on the scope names a security requirement may list

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 75/100

  datamodel-code-generator/datamodel-code-generator#5849 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• Server generation accepts a multipart encoding key that names no property, client generation refuses it

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 80/100

  datamodel-code-generator/datamodel-code-generator#5848 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• Generated server parses an untyped multipart member with encoding text/plain as JSON, while the client sends text

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 75/100

  datamodel-code-generator/datamodel-code-generator#5847 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• The served openapi.json of a generated server resolves an $anchor to an example value that spells it

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 85/100

  datamodel-code-generator/datamodel-code-generator#5846 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• OpenAPI 3.0: a $ref with a sibling format: binary is typed bytes, although siblings of a Reference Object are ignored

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 68/100

  datamodel-code-generator/datamodel-code-generator#5845 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• Client and server accept a JSON body property written as $ref with a sibling format: binary, although the model holds bytes (OpenAPI 3.1)

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 70/100

  datamodel-code-generator/datamodel-code-generator#5844 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• A multipart or URL-encoded body that reaches a closed object through allOf accepts extra members in client and server

  May be free again A pull request for this issue was closed without being merged. Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 80/100

  datamodel-code-generator/datamodel-code-generator#5843 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• Client and server generation refuse a multipart file part whose format --type-mappings maps to binary

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 85/100

  datamodel-code-generator/datamodel-code-generator#5842 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• A multipart body with allOf branches that declare the same property gets a client plan that depends on the branch order

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 70/100

  datamodel-code-generator/datamodel-code-generator#5841 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• Client and server drop the annotations of a $ref target when the $ref has a sibling keyword (OpenAPI 3.1)

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 85/100

  datamodel-code-generator/datamodel-code-generator#5840 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• Client and server generation refuse an object schema without type as a query parameter or URL-encoded body

  May be free again A pull request for this issue was closed without being merged. Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 80/100

  datamodel-code-generator/datamodel-code-generator#5839 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• Client generation with --reuse-model fails when a multipart response repeats the request's inline schema with a binary part

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 65/100

  datamodel-code-generator/datamodel-code-generator#5827 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• A field named frozenset typed as a uniqueItems array is not renamed under --use-generic-container-types

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 70/100

  datamodel-code-generator/datamodel-code-generator#5826 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• A deep-copied field type keeps the null --omit-redundant-reference-null drops

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 80/100

  datamodel-code-generator/datamodel-code-generator#5824 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• maxLength and minLength beside an array are written as the list's item count bounds

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 70/100

  datamodel-code-generator/datamodel-code-generator#5821 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• --use-unique-items-as-set warns that a Sequence of tuples would lose tuple positions

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 70/100

  datamodel-code-generator/datamodel-code-generator#5820 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• --collapse-root-models --field-constraints drops item constraints of Sequence, Mapping and frozenset fields

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 75/100

  datamodel-code-generator/datamodel-code-generator#5819 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• --generate-schema-validators skips uniqueItems of a frozenset field whose items are arrays

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 70/100

  datamodel-code-generator/datamodel-code-generator#5818 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• An allOf array typed as frozenset with enum items crashes --generate-schema-validators with StopIteration

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 75/100

  datamodel-code-generator/datamodel-code-generator#5817 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• Client and server binding loses the model --reuse-model replaced when it was moved into an _internal module

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 65/100

  datamodel-code-generator/datamodel-code-generator#5816 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• A parser extension's keyless reference crashes --field-type-collision-strategy rename-type

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 75/100

  datamodel-code-generator/datamodel-code-generator#5802 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• Install hints spell the pip command inconsistently, most with a glued "$pip" prompt

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 85/100

  datamodel-code-generator/datamodel-code-generator#5797 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• --import-overrides of Sequence makes generated clients and servers refuse array parameters

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 65/100

  datamodel-code-generator/datamodel-code-generator#5793 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• Reserved helper argument error says "rename them" for a single argument

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 85/100

  datamodel-code-generator/datamodel-code-generator#5792 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• GraphQL install hint swaps the closing quote and backtick

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 1/5 Under an hour Newbie friendliness 85/100

  datamodel-code-generator/datamodel-code-generator#5791 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• generate() target runs check ~/... against the home directory but write the package under ./~/...

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 70/100

  datamodel-code-generator/datamodel-code-generator#5782 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day

• Client _operations.py defines the same _<NAME>_HEADERS constant twice for operationIds that upper-case alike

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  bug

  Difficulty 3/5 1-2 days Newbie friendliness 70/100

  datamodel-code-generator/datamodel-code-generator#5781 · Opened Oct 31, 2026

  Maintainers usually reply within 1 day