From: "Sam s." <samuel.stuetz@...>
Date: 2011-10-01T22:28:50+09:00
Subject: access hashmap objects

I got objects inside of a hashmap. And they are packed as the following
code says and I want to unpack them again to change their manipulate the
data and pack it again in the same way. Or directly change each datum if
that works.

mutation_map = key => {
          column_family => hash.collect{|k,v|
_standard_insert_mutation(column_family, k, v, timestamp,
options[:ttl])}
        }

def _standard_insert_mutation(column_family, column_name, value,
timestamp, ttl = nil)
      CassandraThrift::Mutation.new(
        :column_or_supercolumn =>
CassandraThrift::ColumnOrSuperColumn.new(
          :column => CassandraThrift::Column.new(
            :name      =>
column_name_class(column_family).new(column_name).to_s,
            :value     => value,
            :timestamp => timestamp,
            :ttl       => ttl
          )
        )
Code from the fauna project on github. A ruby cassandra client.

now I think I understand what happens in this bit of code, but if I have
this mutation_map later in code and want to manipulate specific parts of
it how would I do that.
Like encrypting the whole map. I would need access to each bit and
change it
getting to the column_family I write mutation_map[key][column_family]
How do I go from there? I have an object now and this object should have
accessor methodes.

I know java not as much about ruby. How do I access that data. Should
simple for any ruby veteran but in all the tutorials they stick to such
simple stuff that you don't learn this kind of things.

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