Ejemplo

Validate a plain map with Ecto.Changeset alone: an embedded_schema, no Repo, no database and no ecto_sql

sha256:ec1c423e61b01693526ccce5e694e6c68ed968878f00b8331b3d82c953abea87

Caso

Objetivo

Validate a plain map with Ecto.Changeset alone: an embedded_schema, no Repo, no database and no ecto_sql HOW

Paquetes

ecto 3.14.1

Entorno

elixir 1

Creado

2026-08-14T14:09:57Z

Contrato

• assert Ecto.Changeset validates with :ecto alone: ecto_sql is not installed and Ecto.Adapters.SQL will not load, while the embedded_schema reports no source table and no prefix where an otherwise identical schema/2 block reports its table name
• assert embedded_schema's own default primary key is an autogenerated binary_id that nothing outside a Repo insert ever fills in, so it stays nil, which is why the schema turns it off
• assert cast/4 keeps only the permitted fields and silently drops the rest, adding no error for a real-but-unpermitted field or for a key that is not a field at all, while changeset.params still holds the raw attempt and permitting that same field would have accepted it with no error either
• assert permitting a field the schema does not have raises ArgumentError, so a typo in the permitted list fails loudly while an unexpected param never does
• assert cast substitutes the field's default for an empty or whitespace-only string, so validate_required reports can't be blank, and that the substituted value is the declared default rather than nil, which silently resets a field that has one
• assert a value that survives the emptiness check is stored untrimmed, so only the check trims
• assert validate_required runs no blank check of its own and reuses changeset.empty_values, so casting with empty_values: [] lets an empty string pass validation while a validator that inspects the value still catches it
• assert passing a function in :empty_values now raises ArgumentError and the two-arity :trim_values option is the replacement
• assert validate_required decides presence with get_field, so a field carrying a non-nil schema default can never be reported missing, on a failing changeset or a passing one
• assert a type failure from cast is reported as is invalid with validation: :cast, leaves the field out of changes, and suppresses the later validators for that field
• assert apply_action/2 returns {:ok, struct} or {:error, changeset} with :action stamped onto the error changeset, apply_action!/2 raises Ecto.InvalidChangesetError, and apply_changes/1 returns the struct even when the changeset is invalid
• assert validate_number stores a %{number} placeholder plus interpolation metadata while validate_format's message is already complete, so a raw error message is not displayable
• assert traverse_errors interpolates and groups the repeated keys of changeset.errors into the field-to-list-of-messages map an API error body is built from, where a plain keyword lookup on changeset.errors returns only the most recent of a field's several errors
• assert put_change writes to changes regardless of the permitted list and regardless of the validators that already ran, is a no-op when the value equals the one on the data, and force_change/3 is the override

Archivos

• csx.json
• lib/csx_ecto/signup.ex
• mix.exs
• mix.lock
• test/contract_test.exs
• test/test_helper.exs

Seeder de origen

anonymous

Recibos de verificación

• elixir 1 · CONTAINER_RUN · compile:PASS · contract:PASS · load:PASS · resolve:PASS · hex@1 · 2026-08-14 · ed25519:a2ec939a4c60e243
• · CONTAINER_RUN · compile:SKIPPED · contract:SKIPPED · load:SKIPPED · resolve:FAIL · hex@1 · 2026-08-14 · ed25519:7da3f610facce8bf