display variable object name ROR

Question

I have 2 previously defined strings :

table_string that holds the table name and field_string that holds the field name in this table , these 2 strings are variables and change depending on the previous page where they are coming

for example in a specified page i will press on a link that will redirect me to this page with table_string=user and field_string=fullname I should here access the attribute @user.fullname I tried to concatenate table_string + "." + field_stringin another string let's say x and then display<%= @x %>as if im typing@user.fullname` but this does not work

How can I display this variable field knowing that the table name will also changes ???

Check out the send method: apidock.com/ruby/Object/send . As for the object instantiation, I don't think it's possible to do it the way you propose. — jlhonora
– jlhonora, Commented Aug 12, 2015 at 12:43
this is not useful because i need the object name (table name ) to be variable also . — am_am
– am_am, Commented Aug 12, 2015 at 12:48
well now i fixed the table name , but when trying to write @student.send("name") it does not work , is there any function other than send — am_am
– am_am, Commented Aug 13, 2015 at 11:39

chumakoff · Accepted Answer · 2015-08-12 13:07:24Z

1

Try the 'instance_variable_get' method.

table_name = 'user'
column_name = 'name'
instance_variable_get("@#{table_name}").send(column_name)

or just

instance_variable_get("@#{table_name}")[column_name]

answered Aug 12, 2015 at 13:07

chumakoff

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