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GraphQL for Elixir
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Files
lib/absinthe/adapter.ex
defmodule Absinthe.Adapter do
@moduledoc """
Absinthe supports an adapter mechanism that allows developers to define their
schema using one code convention (eg, `snake_cased` fields and arguments), but
accept query documents and return results (including names in errors) in
another (eg, `camelCase`).
Adapters aren't a part of GraphQL, but a utility that Absinthe adds so that
both client and server can use use conventions most natural to them.
Absinthe ships with two adapters:
* `Absinthe.Adapter.LanguageConventions`, which expects schemas to be defined
in `snake_case` (the standard Elixir convention), translating to/from `camelCase`
for incoming query documents and outgoing results. (This is the default as of v0.3.)
* `Absinthe.Adapter.Passthrough`, which is a no-op adapter and makes no
modifications. (Note at the current time this does not support introspection
if you're using camelized conventions).
To set an adapter, you can set an application configuration value:
```
config :absinthe,
adapter: YourApp.Adapter.TheAdapterName
```
Or, you can provide it as an option to `Absinthe.run/3`:
```
Absinthe.run(
query,
MyApp.Schema,
adapter: YourApp.Adapter.TheAdapterName
)
```
Notably, this means you're able to switch adapters on case-by-case basis.
In a Phoenix application, this means you could even support using different
adapters for different clients.
A custom adapter module must merely implement the `Absinthe.Adapter` protocol,
in many cases with `use Absinthe.Adapter` and only overriding the desired
functions.
## Writing Your Own
All you may need to implement in your adapter is `to_internal_name/2` and
`to_external_name/2`.
Check out `Absinthe.Adapter.LanguageConventions` for a good example.
Note that types that are defined external to your application (including
the introspection types) may not be compatible if you're using a different
adapter.
"""
@type t :: module
defmacro __using__(_) do
quote do
@behaviour unquote(__MODULE__)
def to_internal_name(external_name, _role) do
external_name
end
def to_external_name(internal_name, _role) do
internal_name
end
defoverridable [
to_internal_name: 2,
to_external_name: 2
]
end
end
@typedoc "The lexical role of a name within the document/schema."
@type role_t :: :operation | :field | :argument | :result | :type | :directive
@doc """
Convert a name from an external name to an internal name.
## Examples
Prefix all names with their role, just for fun!
```
def to_internal_name(external_name, role) do
role_name = role |> to_string
role_name <> "_" <> external_name
end
```
"""
@callback to_internal_name(binary, role_t) :: binary
@doc """
Convert a name from an internal name to an external name.
## Examples
Remove the role-prefix (the inverse of what we did in `to_internal_name/2` above):
```
def to_external_name(internal_name, role) do
internal_name
|> String.replace(~r/^\#{role}_/, "")
end
```
"""
@callback to_external_name(binary, role_t) :: binary
end