Hyperstack::Operation
  step { abort!({error: "some description"}) }
end

.fail {|e| e.result } 

Hyperstack::Operation
  step { fail }
  failed do
    {error: "some description"}
  end
end

# returns !!Hash !! {"error"=>"some description"}
#
.fail {|e| puts "!!#{e.class} !! #{e}" }

class SignUpOp < Hyperstack::Operation
  param :email, type: String
  param :password, type: String
  param :password_confirmation, type: String
  
   validate do
     add_error(
       :password_confirmation,
       :doesnt_match,
       "Your new password and confirmation do not match"
     ) unless params.password == params.password_confirmation
   end
end

# In some component

SignUpOp.run(email: nil, password: 'aaa', password_confirmation: 'bbb')
.fail do |e|
  puts e.errors.class    # Mutations::ErrorHash
  puts e.errors.symbolic # {"email"=>"required", "password_confirmation"=>"doesnt_match"}
  puts e.errors.message  # {"email"=>"email is required", "password_confirmation"=>"Your new password and confirmation do not match"}
  
  # if I change the base operation class to Hyperstack::ControllerOp
  
  puts e.errors.class    # Mutations::ErrorArray (we need Mutations::ErrorHash here)
  puts e.errors.symbolic # required,doesnt_match
  puts e.errors.message  # email is required,Your new password and confirmation do not match  
                          
end

class SignUpOp < Hyperstack::Operation

  step do 
    h = { some_key: 'aaa' }
    abort! h
  end

end

SignUpOp.run()
.fail do |e|
  puts e.class           # Hyperstack::Operation::Exit
  puts e.result          # {"some_key"=>"aaa"}
  puts e.result[:key]    # aaa
  
  # if I change the base operation class to Hyperstack::ControllerOp
  puts e.class           # Hyperstack::Operation::Exit
  puts e.result          # nothing
end

class SignUpOp < Hyperstack::Operation
  step { fail! }
  failed do
    { some_key: 'aaa' }
  end
end

SignUpOp.run()
.fail do |e|
  puts e.class       # Hash
  puts e             # {"some_key"=>"aaa"}
  puts e[:some_key]  # aaa
  
  # if I change the base operation class to Hyperstack::ControllerOp
  puts e.class       # Hash
  puts e             # {}
end