Method: GraphQL::Execution::Lookahead#selection

Defined in:
lib/graphql/execution/lookahead.rb

#selection(field_name, selected_type: @selected_type, arguments: nil) ⇒ GraphQL::Execution::Lookahead

Like #selects?, but can be used for chaining. It returns a null object (check with #selected?)

Parameters:

  • field_name (String, Symbol)

Returns:



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# File 'lib/graphql/execution/lookahead.rb', line 115

def selection(field_name, selected_type: @selected_type, arguments: nil)
  next_field_defn = case field_name
  when String
    @query.types.field(selected_type, field_name)
  when Symbol
    # Try to avoid the `.to_s` below, if possible
    all_fields = if selected_type.kind.fields?
      @query.types.fields(selected_type)
    else
      # Handle unions by checking possible
      @query.types
        .possible_types(selected_type)
        .map { |t| @query.types.fields(t) }
        .tap(&:flatten!)
    end


    if (match_by_orig_name = all_fields.find { |f| f.original_name == field_name })
      match_by_orig_name
    else
      # Symbol#name is only present on 3.0+
      sym_s = field_name.respond_to?(:name) ? field_name.name : field_name.to_s
      guessed_name = Schema::Member::BuildType.camelize(sym_s)
      @query.types.field(selected_type, guessed_name)
    end
  end
  lookahead_for_selection(next_field_defn, selected_type, arguments)
end