Fix blank conditions on AssociationCollection#find. [#104 state:resolved]

Signed-off-by: Pratik Naik <pratiknaik@gmail.com>

activerecord/lib/active_record/base.rb

@@ -1910,6 +1910,8 @@ def class_name_of_active_record_descendant(klass) #:nodoc:
         #   { :name => "foo'bar", :group_id => 4 }  returns "name='foo''bar' and group_id='4'"
         #   "name='foo''bar' and group_id='4'" returns "name='foo''bar' and group_id='4'"
         def sanitize_sql_for_conditions(condition)
+          return nil if condition.blank?
+
           case condition
             when Array; sanitize_sql_array(condition)
             when Hash;  sanitize_sql_hash_for_conditions(condition)

activerecord/test/cases/associations/has_many_associations_test.rb

@@ -48,6 +48,12 @@ def test_finding
     assert_equal 2, Firm.find(:first).clients.length
   end
 
+  def test_find_with_blank_conditions
+    [[], {}, nil, ""].each do |blank|
+      assert_equal 2, Firm.find(:first).clients.find(:all, :conditions => blank).size
+    end
+  end
+
   def test_find_many_with_merged_options
     assert_equal 1, companies(:first_firm).limited_clients.size
     assert_equal 1, companies(:first_firm).limited_clients.find(:all).size
@@ -851,4 +857,4 @@ def test_include_returns_false_for_non_matching_record_to_verify_scoping
     assert ! firm.clients.include?(client)
   end
 
-end
+end