NAME

       GraphQL::Role::HashMappable - GraphQL object role

SYNOPSIS

         with qw(GraphQL::Role::HashMappable);

         # or runtime
         Role::Tiny->apply_roles_to_object($foo, qw(GraphQL::Role::HashMappable));

DESCRIPTION

       Provides method for mapping code over a hash-ref.

METHODS

   hashmap
       Given a hash-ref, returns a modified copy of the data. Returns undef if given that.
       Parameters:

       $item
           Hash-ref.

       $source
           Hash-ref of the source data for this hash. Will be used only for its keys.

       $code
           Code-ref.

       Each value will be the original value returned by the given code-ref, which is called with
       $keyname, $value. Will call the code for all given keys, but not copy over any values not
       existing in original item.

       If code throws an exception, the message will have added to it information about which
       data element caused it.