How to compare the DB.fetch hash output in Sequel ORM with an existing array?

Question

How to compare the hash output of DB.fetch with an input array?

e.g. if on dataset from hash output of DB.fetch,
dataset.each{|r| p r.values} outputs arrays for each row but what if I want to store these arrays and compare these arrays and and also run computations outside of the {} scope with an existing array?

Answer 1

Your dataset.each{|r| p r.values} returns not array, it prints them.

To get an array with array you could use:

DB[:yourtab].all.map{|v|v.values}

A more complete example:

require 'sequel'
DB = Sequel.sqlite
DB.create_table(:tab1){
  primary_key :id
  field :a, :type => :nvarchar, :size => 10
  field :b, :type => :nvarchar, :size => 10
}

DB[:tab1].insert(:a => 'a1', :b => 'b1')
DB[:tab1].insert(:a => 'a2', :b => 'b2')
DB[:tab1].insert(:a => 'a3', :b => 'b3')

result = DB[:tab1].all.map{|v|v.values}
p result

Result is:

[[1, "a1", "b1"], [2, "a2", "b2"], [3, "a3", "b3"]]