undefined method `eventName' for #<Ethereum::Contract:0x007fa63617ab40>

[wenweih]

hi, thx for contributors nice and hard work. I met a problem and look for help here.
I have build and deploy a smart contract, get the contract object in irb as follow

2.3.1 :067 > con = Ethereum::Contract.new("hello",contracts[0].code, contracts[0].abi)
=> #<Ethereum::Contract:0x007fa63617ab40 @name="hello", @code="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", @abi=[{"constant"=>false, "inputs"=>[], "name"=>"kill", "outputs"=>[], "payable"=>false, "type"=>"function"}, {"constant"=>false, "inputs"=>[], "name"=>"collect", "outputs"=>[], "payable"=>false, "type"=>"function"}, {"inputs"=>[], "type"=>"constructor"}, {"payable"=>true, "type"=>"fallback"}, {"anonymous"=>false, "inputs"=>[{"indexed"=>true, "name"=>"_from", "type"=>"address"}, {"indexed"=>true, "name"=>"_band", "type"=>"uint256"}, {"indexed"=>false, "name"=>"_value", "type"=>"uint256"}], "name"=>"Deposit", "type"=>"event"}], @functions=[#<Ethereum::Function:0x007fa63617a5a0 @name="kill", @constant=false, @inputs=[], @outputs=[], @function_string="kill()", @Signature="41c0e1b5">, #<Ethereum::Function:0x007fa63680ea10 @name="collect", @constant=false, @inputs=[], @outputs=[], @function_string="collect()", @Signature="e5225381">], @events=[#<Ethereum::ContractEvent:0x007fa6364219c0 @name="Deposit", @input_types=["address", "uint256", "uint256"], @inputs=["_from", "_band", "_value"], @event_string="Deposit(address,uint256,uint256)", @Signature="90890809c654f11d6e72a28fa60149770a0d11ec6c92319d6ceb2bb0a4ea1a15">], @constructor_inputs=[]>

there is event named Deposit in the contract, and i want to do as web3.js method in Ruby

var event = myContractInstance.MyEvent({valueA: 23} [, additionalFilterObject])
event.watch(function(error, result){
  if (!error)
    console.log(result);
});

But when coninstance call Deposit method, NoMethodError: undefined method `Deposit' for #<Ethereum::Contract:0x007fa63617ab40> error occur
meanwhile, when i call watch method by event object

2.3.1 :074 > instance = SmartExchange.new
 => #<SmartExchange:0x007fa63631b6e8>

the same error occur. 😦
Is there a way to call event.watch method as web3.js contract-events
many thanks.