operations dispatch?

clause.rb

def clause(op, field, data)
  out = []
  out << ops_table[op][:field_proc].call(field)
  out << ops_table[op][:data_proc].call(data)
  out
end

#later
model.where(*clause(op, field, data))

ops_table.rb

{
    "eq" => {
              :name => "equal",
        :field_proc => lambda{|field| "#{field} = ?"},
         :data_proc => lambda{|data| data}
    },
    "cn" => {
              :name => "contains",
        :field_proc => lambda{|field| "#{field} LIKE ?"},
         :data_proc => lambda{|data| "%#{data}%}
    }
    "ne" => {
              :name => "not equal",
        :field_proc => nil,
         :data_proc => nil
    },
    "lt" => {
              :name => "less",
        :field_proc => nil,
         :data_proc => nil
    },
    "le" => {
              :name => "less or equal",
        :field_proc => nil,
         :data_proc => nil
    },
    "gt" => {
              :name => "greater",
        :field_proc => nil,
         :data_proc => nil
    },
    "ge" => {
              :name => "greater or equal",
        :field_proc => nil,
         :data_proc => nil
    },
    "bw" => {
              :name => "begins with",
        :field_proc => nil,
         :data_proc => nil
    },
    "bn" => {
              :name => "does not begin with",
        :field_proc => nil,
         :data_proc => nil
    },
    "in" => {
              :name => "is in",
        :field_proc => nil,
         :data_proc => nil
    },
    "ni" => {
              :name => "is not in",
        :field_proc => nil,
         :data_proc => nil
    },
    "ew" => {
              :name => "ends with",
        :field_proc => nil,
         :data_proc => nil
    },
    "en" => {
              :name => "does not end with",
        :field_proc => nil,
         :data_proc => nil
    },
    "cn" => {
              :name => "contains",
        :field_proc => nil,
         :data_proc => nil
    },
    "nc" => {
              :name => "does not contain",
        :field_proc => nil,
         :data_proc => nil
    }
}