Accessing Attributes inside an object in Ruby - ruby

Question

I created a Class and created many instances and stored it into an array called messages
If I type,
print messages[0]
It gives
#<SMSMessage:0x00000001681d88 #id=29185, #account_id=1565, #upload_id=0, #txaction_type_id=9, #txid=0, #finanalytics_txid=1565,
#date_posted=2015-05-13 17:58:01 +0530, #sequence=1, #sic_code=0,
#amount=-1802.0, #raw_name="MERLINS", #filtered_name="MERLINS",
#cleaned_name="NULL", #merchant_id="NULL", #memo="NULL",
#check_num="NULL", #ref_num="NULL", #balance=0.0, #created_at=2015-05-13 18:03:30 +0530,
#updated_at=2015-05-13 18:08:17 +0530, #status="0", #tagged=0, #merged_with_txaction_id=0, #note="NULL", #usd_amount=0.0, #attachment_ids="NULL", #automatch=0, #merchant_name="MERLINS", #tag_names=nil, #transfer_txaction_id=0, #fi_date_posted=2015-05-13 17:58:01 +0530, #transaction_status_id=0, #mc_code="NULL", #provider_txn_type="NULL", #latitude=19.09686, #longitude=72.8537753, #sync_status=31, #sec_account_id=0, #associated_sms_id=130672, #account_key="YzI5ZDUyNWY5NmYwNWFiNjJiYmE1YTk4Y2VkYTBjYTZmOGM5ZTI0NzE2MzU2MzAwMmU2OWU2MzNiYmQ2YTZhMA==", #id_on_client=229, #sync_delete_status=0,
#matching_bill_id=0, #mapped_account_number=0, #additional_description="NULL", #category_id=45, #data_processing_flag=4,
#derived_description="NULL", #final_description="NULL", #derived_merchant="Merlins Bar", #final_merchant="NULL",
#tentative_location_flag=-1, #tentative_latitude="-90.00000000000", #tentative_longitude="-90.00000000000", #mongo_merchant_id="102", #parent_category_id=40, #raw_description="NULL", #formatted_description="NULL", #associated_sms_client_id=779, #account_client_id=4>
If i try to access the ID by typing,
print messages[0].id
It gives me an error
NoMethodError: undefined method `id' for #<SMSMessage:0x00000001681d88>
How do I resolve this ?
PS - The SMSMessage Class Code is
class SMSMessage
def initialize(id,account_id,upload_id,txaction_type_id,txid,finanalytics_txid,date_posted,sequence,sic_code,amount,raw_name,filtered_name,cleaned_name,merchant_id,memo,check_num,ref_num,balance,created_at,updated_at,status,tagged,merged_with_txaction_id,note,usd_amount,attachment_ids,automatch,merchant_name,tag_names,transfer_txaction_id,fi_date_posted,transaction_status_id,mc_code,provider_txn_type,latitude,longitude,sync_status,sec_account_id,associated_sms_id,account_key,id_on_client,sync_delete_status,matching_bill_id,mapped_account_number,additional_description,category_id,data_processing_flag,derived_description,final_description,derived_merchant,final_merchant,tentative_location_flag,tentative_latitude,tentative_longitude,mongo_merchant_id,parent_category_id,raw_description,formatted_description,associated_sms_client_id,account_client_id)
#id = id.to_i
#account_id = account_id.to_i
#upload_id = upload_id.to_i
#txaction_type_id = txaction_type_id.to_i
#txid = txid.to_i
#finanalytics_txid = finanalytics_txid.to_i
#date_posted = Time.parse(date_posted)
#sequence = sequence.to_i
#sic_code = sic_code.to_i
#amount = amount.to_f
#raw_name = raw_name
#filtered_name = filtered_name
#cleaned_name = cleaned_name
#merchant_id = merchant_id
#memo = memo
#check_num = check_num
#ref_num = ref_num
#balance = balance.to_f
#created_at = Time.parse(created_at)
#updated_at = Time.parse(updated_at)
#status = status
#tagged = tagged.to_i
#merged_with_txaction_id = merged_with_txaction_id.to_i
#note = note
#usd_amount = usd_amount.to_f
#attachment_ids = attachment_ids
#automatch = automatch.to_i
#merchant_name = merchant_name
#tag_names = tag_names
#transfer_txaction_id = transfer_txaction_id.to_i
#fi_date_posted = Time.parse(fi_date_posted)
#transaction_status_id = transaction_status_id.to_i
#mc_code = mc_code
#provider_txn_type = provider_txn_type
#latitude = latitude.to_f
#longitude = longitude.to_f
#sync_status = sync_status.to_i
#sec_account_id = sec_account_id.to_i
#associated_sms_id = associated_sms_id.to_i
#account_key = account_key
#id_on_client = id_on_client.to_i
#sync_delete_status = sync_delete_status.to_i
#matching_bill_id = matching_bill_id.to_i
#mapped_account_number = mapped_account_number.to_i
#additional_description = additional_description
#category_id = category_id.to_i
#data_processing_flag = data_processing_flag.to_i
#derived_description = derived_description
#final_description = final_description
#derived_merchant = derived_merchant
#final_merchant = final_merchant
#tentative_location_flag = tentative_location_flag.to_i
#tentative_latitude = tentative_latitude.to_f
#tentative_longitude = tentative_longitude.to_f
#mongo_merchant_id = mongo_merchant_id
#parent_category_id = parent_category_id.to_i
#raw_description = raw_description
#formatted_description = formatted_description
#associated_sms_client_id = associated_sms_client_id.to_i
#account_client_id = account_client_id.to_i
end
end

Answer 1

Since you do not define accessor methods for object attributes, you should use instance_variable_get:
messages[0].instance_variable_get(:#id)
To be able to read id attribute (that is messages[0].id) you would want to add
attr_reader :id
to your model. If you will need to write this attribute, you would define attr_writer :id.
For both (read and write) there is a attr_accessor :id.