mislav

[Ruby] On ActiveRecord: named_scope for a boolean

2008-06-19T19:46:20-07:00

When you have to support NULL value and treat is as false in this particular case:

class MyModel
  named_scope :not_hidden, :conditions => ['hidden IS NULL OR hidden = ?', false]
end

[Ruby] On ActiveRecord: named_scope for a boolean

2008-06-19T19:44:59-07:00

When NULL value is not allowed, this is adequate:

class MyModel
  named_scope :not_hidden, :conditions => { :hidden => false }
end

[Ruby] ActiveRecord: named_scope for a boolean

2008-06-19T18:46:44-07:00

Can ActiveRecord be used to abstract this more nicely across databases?

class MyModel
  named_scope :not_hidden, :conditions => ['hidden IS NULL OR hidden = 0 OR hidden = ?', 'f']
end

[Ruby] Given a hash of variables, render an ERB template

2008-04-12T15:12:14-07:00

This works. Now, is there a simpler way than my solution?

require 'erb'

# GOAL: render the template with the following vars
vars = { :first => 'Mislav', 'last' => 'Marohnic' }
template = 'Name: <%= first %> <%= last %>'

# create anonymous module which binding we will use
m = Module.new do
  # I want the singleton class, thank you
  class << self
    public :binding
    
    def meta
      class << self; self; end
    end
  end

  class << meta
    public :define_method
  end

  # define singleton method for each var
  vars.each do |name, value|
    meta.define_method(name) { value }
  end
end

puts ERB.new(template).result(m.binding)
#=> "Name: Mislav Marohnic"