errors.rb

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'graphql', '1.10.10'
end

class BaseArgument < GraphQL::Schema::Argument
  def initialize(*args, **kwargs, &block)
    super(*args, prepare: method(:convert_id), **kwargs, &block)
  end

  def convert_id(value, ctx)
    if ctx[:raise_in_prepare]
      raise GraphQL::ExecutionError, 'invalid id'
    end

    value
  end
end

class BaseField < GraphQL::Schema::Field
  argument_class(BaseArgument)
end

class BaseObject < GraphQL::Schema::Object
  field_class(BaseField)
end

class BaseInputObject < GraphQL::Schema::InputObject
  argument_class(BaseArgument)
end

class MyID < GraphQL::Schema::Scalar
  def self.coerce_input(value, ctx)
    if ctx[:raise_in_coerce]
      raise GraphQL::CoercionError, "Invalid id '#{value}'"
    end

    value
  end
end

class ThingInput < BaseInputObject
  argument :id, MyID, required: true
end

class Query < BaseObject
  field :thing, MyID, null: true do
    argument :id, MyID, required: true
  end

  def thing(id:)
    id
  end

  field :thing_input, MyID, null: true do
    argument :input, ThingInput, required: true
  end

  def thing_input(input:)
    input[:id]
  end
end

class Schema < GraphQL::Schema
  query Query
end

puts "=> Scalar ID inline"
pp Schema.execute('{ thing(id: "1") }', context: {}).to_h
puts "=> Scalar ID inline (raise_in_prepare)"
pp Schema.execute('{ thing(id: "1") }', context: { raise_in_prepare: true }).to_h
puts "=> Scalar ID inline (raise_in_coerce)"
pp Schema.execute('{ thing(id: "1") }', context: { raise_in_coerce: true }).to_h
puts "= >Scalar ID inline (raise in both)"
pp Schema.execute('{ thing(id: "1") }', context: { raise_in_coerce: true, raise_in_prepare: true }).to_h

variables = { id: "1" }
puts "=> Scalar ID via variable"
pp Schema.execute('query($id: MyID!) { thing(id: $id) }', context: {}, variables: variables).to_h
puts "=> Scalar ID via variable (raise_in_prepare)"
pp Schema.execute('query($id: MyID!) { thing(id: $id) }', context: { raise_in_prepare: true }, variables: variables).to_h
puts "=> Scalar ID via variable (raise_in_coerce)"
pp Schema.execute('query($id: MyID!) { thing(id: $id) }', context: { raise_in_coerce: true }, variables: variables).to_h
puts "=> Scalar ID via variable (raise) in both"
pp Schema.execute('query($id: MyID!) { thing(id: $id) }', context: { raise_in_coerce: true, raise_in_prepare: true }, variables: variables).to_h

puts "=> Input object ID inline"
pp Schema.execute('{ thingInput(input: { id: "1" }) }', context: {}).to_h
puts "=> Input object ID inline (raise_in_prepare)"
pp Schema.execute('{ thingInput(input: { id: "1" }) }', context: { raise_in_prepare: true }).to_h
puts "=> Input object ID inline (raise_in_coerce)"
pp Schema.execute('{ thingInput(input: { id: "1" }) }', context: { raise_in_coerce: true }).to_h
puts "=> Input object ID inline (raise in both)"
pp Schema.execute('{ thingInput(input: { id: "1" }) }', context: { raise_in_coerce: true, raise_in_prepare: true }).to_h

variables = { input: { id: "1" } }
puts "=> Input object ID via variable"
pp Schema.execute('query($input: ThingInput!) { thingInput(input: $input) }', context: {}, variables: variables).to_h
puts "=> Input object ID via variable (raise_in_prepare)"
pp Schema.execute('query($input: ThingInput!) { thingInput(input: $input) }', context: { raise_in_prepare: true }, variables: variables).to_h
puts "=> Input object ID via variable (raise_in_coerce)"
pp Schema.execute('query($input: ThingInput!) { thingInput(input: $input) }', context: { raise_in_coerce: true }, variables: variables).to_h
puts "=> Input object ID via variable (raise in both)"
pp Schema.execute('query($input: ThingInput!) { thingInput(input: $input) }', context: { raise_in_coerce: true, raise_in_prepare: true }, variables: variables).to_h