# `Grephql.Types.Typename`
[🔗](https://github.com/fahchen/grephql/blob/v0.10.1/lib/grephql/types/typename.ex#L1)

Parameterized Ecto Type for GraphQL `__typename` fields.

Converts GraphQL type name strings (e.g., `"User"`, `"SearchResult"`)
to snake_cased Elixir atoms (e.g., `:user`, `:search_result`).

The string-to-atom mapping is pre-computed at compile time in `init/1`.
At runtime, `cast/2` and `load/3` perform only a `Map.fetch/2` lookup.

## Usage in schema

    field :__typename, Grephql.Types.Typename, values: ["User", "Post"]

Ecto calls `init/1` automatically with the field options.

# `t`

```elixir
@type t() :: atom()
```

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*Consult [api-reference.md](api-reference.md) for complete listing*