AshTypescript.Rpc.ValueFormatter (ash_typescript v0.17.2)

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Unified value formatting for RPC input/output.

Traverses composite values recursively, applying field name mappings and type-aware formatting at each level.

The type and constraints parameters provide all context needed - no separate "resource" context is required because each type is self-describing:

  • For Ash resources: field types come from Ash.Resource.Info.attribute/2
  • For TypedStructs: field types come from constraints[:fields]
  • For typed maps: field types come from constraints[:fields]
  • For unions: member type and constraints come from constraints[:types][member]

Key Design Principle

The "parent resource" is never needed because each type is self-describing. When we recurse into a nested value, we pass the field's type and constraints, which contain all the information needed to format that value correctly.

Summary

Types

direction()

Functions

format(value, type, constraints, formatter, direction)

Formats a value based on its type and constraints.

Types

direction()

@type direction() :: :input | :output

Functions

format(value, type, constraints, formatter, direction)

@spec format(term(), atom() | tuple() | nil, keyword(), atom(), direction()) :: term()

Formats a value based on its type and constraints.

Parameters

  • value - The value to format
  • type - The Ash type (e.g., MyApp.EmbeddedResource, Ash.Type.Map, {:array, X})
  • constraints - Type constraints (e.g., [fields: [...]], [instance_of: Module])
  • formatter - The field formatter configuration (:camel_case, :snake_case, etc.)
  • direction - :input (client→internal) or :output (internal→client)

Returns

The formatted value with field names converted according to direction.