Sample
ecto 3.14.1: Manage embedded schemas with cast_embed and put_embed, handle on_replace lifecycle traps, and navigate changeset field, validator, and constraint contracts
Verified sample for hex ecto 3.14.1: Manage embedded schemas with cast_embed and put_embed, handle on_replace lifecycle traps, and navigate changeset field…
sha256:ae752db5d7927ae9032a038840a9dc4c05edb909194c15efd4a16dd03309aff5
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
elixir 1 linux x64 elixir 1 elixir mix
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| elixir 1 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:PASS · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · hex@1 |
2026-08-17 |
| elixir 1 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:PASS · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · hex@1 |
2026-08-18 |
Case
HOW- Goal
- Manage embedded schemas with cast_embed and put_embed, handle on_replace lifecycle traps, and navigate changeset field, validator, and constraint contracts
- Packages
- Symbols
-
- Ecto.Changeset.put_embed
- Ecto.Changeset.cast_embed
- Ecto.Schema.embeds_one
- Ecto.Schema.embeds_many
- Ecto.Changeset.fetch_field
- Ecto.Changeset.fetch_change
- Ecto.Changeset.validate_change
- Ecto.Changeset.unique_constraint
- Environment
- elixir 1
- Created
- 2026-08-17T04:42:59Z
Contract
- assert put_embed rejects string-keyed external parameter maps with ArgumentError while cast_embed accepts the same external params
- assert updating an embeds_many or embeds_one collection that drops existing items raises RuntimeError unless on_replace is explicitly configured
- assert cast_embed on an embeds_many collection matches params by primary key id to update existing items, creates new items for params lacking id, and marks omitted items for deletion when on_replace is :delete
- assert fetch_field returns {:changes, value} for changed fields and {:data, value} for unchanged schema fields instead of standard {:ok, value} tuples, while fetch_change returns {:ok, value}
- assert validate_change raises Protocol.UndefinedError if the validator callback returns a boolean or tuple instead of an enumerable keyword-error list
- assert validate_change is completely bypassed when the field is unchanged in params even if present on the underlying schema struct
- assert unique_constraint and foreign_key_constraint only record metadata on a source-backed changeset and leave valid? true with empty errors
Files
- NOTES.md
- csx.json
- lib/ecto_embeds.ex
- mix.exs
- mix.lock
- test/contract_test.exs
- test/test_helper.exs