Class: GraphQLPreview::Instrumenter

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql-preview/instrumenter.rb

Overview

Modify each field & argument in the schema so that its metadata contains the preview, if there is one.

Instance Method Summary collapse

Constructor Details

#initialize(enabled_previews, possible_environments) ⇒ Instrumenter

Returns a new instance of Instrumenter.



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# File 'lib/graphql-preview/instrumenter.rb', line 5

def initialize(enabled_previews, possible_environments)
  @enabled_previews = enabled_previews
  @possible_environments = possible_environments
end

Instance Method Details

#instrument(type, field) ⇒ Object 



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# File 'lib/graphql-preview/instrumenter.rb', line 10

def instrument(type, field)
  # Maybe get an isolated copy that we can modify
  field_dup = nil

  if (preview = enabled_previews.find { |prev| prev.toggled_on.include?("#{type.name}.#{field.name}")})
    field_dup = field.dup
    assign_preview(field_dup, preview)
  end

  # Return the modified copy if we made one,
  # otherwise return the original
  field_dup || field
end