Simplify query_attribute by typecasting the attribute value and checking whether it's nil, false, zero or blank. Closes #6659.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5593 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Simplify query_attribute by typecasting the attribute value and checking whether it's nil, false, zero or blank.  #6659 [Jonathan Viney]
+
 * validates_numericality_of uses \A \Z to ensure the entire string matches rather than ^ $ which may match one valid line of a multiline string.  #5716 [Andreas Schwarz]
 
 * Run validations in the order they were declared.  #6657 [obrie]

activerecord/lib/active_record/base.rb

@@ -1976,23 +1976,15 @@ module ActiveRecord #:nodoc:
       end
 
       def query_attribute(attr_name)
-        attribute = @attributes[attr_name]
-        if attribute.kind_of?(Fixnum) && attribute == 0
-          false
-        elsif attribute.kind_of?(String) && attribute == "0"
-          false
-        elsif attribute.kind_of?(String) && attribute.empty?
-          false
-        elsif attribute.nil?
-          false
-        elsif attribute == false
-          false
-        elsif attribute == "f"
-          false
-        elsif attribute == "false"
+        unless value = read_attribute(attr_name)
           false
         else
-          true
+          column = self.class.columns_hash[attr_name]
+          if column.number?
+            !value.zero?
+          else
+            !value.blank?
+          end
         end
       end
 

activerecord/test/base_test.rb

@@ -269,7 +269,34 @@ class BasicsTest < Test::Unit::TestCase
     assert topic.approved?, "approved should be true"
     # puts ""
   end
-
+  
+  def test_query_attribute_string
+    [nil, "", " "].each do |value|
+      assert_equal false, Topic.new(:author_name => value).author_name?
+    end
+    
+    assert_equal true, Topic.new(:author_name => "Name").author_name?
+  end
+  
+  def test_query_attribute_number
+    [nil, 0, "0"].each do |value|
+      assert_equal false, Developer.new(:salary => value).salary?
+    end
+    
+    assert_equal true, Developer.new(:salary => 1).salary?
+    assert_equal true, Developer.new(:salary => "1").salary?
+  end
+  
+  def test_query_attribute_boolean
+    [nil, "", false, "false", "f", 0].each do |value|
+      assert_equal false, Topic.new(:approved => value).approved?
+    end
+    
+    [true, "true", "1", 1].each do |value|
+      assert_equal true, Topic.new(:approved => value).approved?
+    end
+  end
+  
   def test_reader_generation
     Topic.find(:first).title
     Firm.find(:first).name