Module: BooleTime

Defined in:
lib/boole_time.rb,
lib/boole_time/version.rb

Constant Summary collapse

TRUE_VALUES = 
[true, 1, '1', 't', 'T', 'true', 'TRUE', 'on', 'ON'].freeze
VERSION = 
'0.2.0'

Instance Method Summary collapse

Instance Method Details

#boole_time(*fields) ⇒ Object

Creates a boolean attribute that corresponds to a date or date_time attribute. For instance:

class Post < ActiveRecord::Base
  boole_time :published_at
end

Generates these methods:

post.published = true
# sets published_at to Time.now
post.published
# => true
post.published = false
# sets published_at to nil
post.published?
# => false



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# File 'lib/boole_time.rb', line 25

def boole_time(*fields)
  options = fields.extract_options!
  mixin   = generated_feature_methods

  fields.each do |field|
    name        = options[:name]        || field.to_s.sub(/_(at|on)\z/, '')
    negative    = options[:negative]    || "un#{name}"
    true_scope  = options[:true_scope]  || name
    false_scope = options[:false_scope] || negative

    unless options[:scopes] == false
      # Define truthy scope
      scope(true_scope, Proc.new {
        where(arel_table[field].lt(Time.now))
      }) unless options[:true_scope] == false

      # Define falsy scope
      scope(false_scope, Proc.new {
        field_attr = arel_table[field]
        where(field_attr.eq(nil).or(field_attr.gt(Time.now)))
      }) unless options[:false_scope] == false
    end

    # Define writer method
    mixin.redefine_method(:"#{name}=") do |value|
      if TRUE_VALUES.include?(value)
        __send__(:"#{field}=", Time.now) unless __send__(name)
      else
        __send__(:"#{field}=", nil) if __send__(name)
      end
    end

    # Define reader and query methods
    mixin.redefine_method(name) do
      value = __send__(field)
      value.present? && value < Time.now
    end
    mixin.redefine_method(:"#{name}?") { __send__(name) }

    # Define negative reader and query methods
    unless options[:negative] == false
      mixin.redefine_method(negative)        { !__send__(name) }
      mixin.redefine_method(:"#{negative}?") { !__send__(name) }
    end
  end
end