Boolean values with SQLite and Sequel

Question

Sequel supports a boolean type. It stores true and false as t and f in SQLite. If you read again, the data are converted back to true and false

SQLite itself prefers to store true as 1 and false as 0 (and some SQLite-administartion tools expect it). If I store my boolean also as '1', Sequel also converts the value to 'true':

require 'sequel'
DB = Sequel.sqlite()#'test.db')
DB.create_table(:test){
  boolean :my_truth
  nvarchar :descr, :size => 10
}
DB[:test].insert(1, '1')
p DB[:test].filter(:descr => '1').first #-> {:my_truth=>true, :descr=>"1"}

But if I select for true, no value is found:

DB[:test].filter(:my_truth => true).each{|ds|
  puts "\t%s" % ds[:descr]
}

The values true and "t" are found:

DB[:test].insert(true, 'true')
DB[:test].insert('t', '"t"')
DB[:test].filter(:my_truth => true).each{|ds|
  puts "\t%s" % ds[:descr]    #true and 't'
}

There is a similar situation for false-values like 0... (see example code after the question)

So my question: How can i make DB[:test].filter(:my_truth => true) to detect 1-values and DB[:test].filter(:my_truth => false) to detect 0-values?

I'm not looking for something like DB[:test].filter(:my_truth => [true,1])

Similar question for Activerecord Rails 3 SQLite3 Boolean false

I use Sequel 3.33.0

---

Example code:

require 'sequel'
DB = Sequel.sqlite()#'test.db')
DB.create_table(:test){
  boolean :my_truth
  nvarchar :descr, :size => 10
  fixnum :line  #code line, where data is inserted
}

#All true:
DB[:test].insert(true, 'true', __LINE__)
DB[:test].insert('true', '"true"', __LINE__)
DB[:test].insert(1, 'one', __LINE__)
DB[:test].insert('t', 't', __LINE__)

#All false:
DB[:test].insert(false,'false', __LINE__)
DB[:test].insert('false','"false"', __LINE__)
DB[:test].insert(0,'zero', __LINE__)
DB[:test].insert('f', 'f', __LINE__)
DB[:test].insert('F', 'F', __LINE__)
DB[:test].insert(nil, 'nil', __LINE__)
DB[:test].insert('n', 'n', __LINE__)
DB[:test].insert('N', 'N', __LINE__)

#Also true
DB[:test].insert('x', 'x', __LINE__)
DB[:test].insert(' ', 'space', __LINE__)
DB[:test].insert('', 'empty', __LINE__)

puts "All true values:"
DB[:test].filter(:my_truth => true).each{|ds|
  puts "\t%s (line %i)" % [ds[:descr],  ds[:line] ]
}

puts "All false values:"
DB[:test].filter(:my_truth => false).each{|ds|
  puts "\t%s (line %i)" % [ds[:descr],  ds[:line] ]
}

puts "Data:"
DB[:test].each{|ds|
  puts "\t%-5s is <%s> (line %i)" % [ ds[:descr], ds[:my_truth].inspect, ds[:line] ]
}

Result:

All true values:
  true (line 10)
  t (line 13)
All false values:
  false (line 16)
  f (line 19)
Data:
  true  is <true> (line 10)
  "true" is <true> (line 11)
  one   is <true> (line 12)
  t     is <true> (line 13)
  false is <false> (line 16)
  "false" is <false> (line 17)
  zero  is <false> (line 18)
  f     is <false> (line 19)
  F     is <false> (line 20)
  nil   is <nil> (line 21)
  n     is <false> (line 22)
  N     is <false> (line 23)
  x     is <true> (line 26)
  space is <true> (line 27)
  empty is <true> (line 28)

Answer 1

You can use the integer_booleans setting to use 1/0 as true/false, instead of 't'/'f', see http://sequel.rubyforge.org/rdoc-adapters/classes/Sequel/SQLite/DatabaseMethods.html. Here's an example:

DB = Sequel.sqlite(:integer_booleans=>true)