diff options
| -rw-r--r-- | activerecord/CHANGELOG | 5 | ||||
| -rwxr-xr-x | activerecord/lib/active_record/base.rb | 6 | ||||
| -rw-r--r-- | activerecord/test/cases/finder_test.rb | 11 |
3 files changed, 19 insertions, 3 deletions
diff --git a/activerecord/CHANGELOG b/activerecord/CHANGELOG index 027533aa2d..a63c09bbaa 100644 --- a/activerecord/CHANGELOG +++ b/activerecord/CHANGELOG @@ -1,3 +1,8 @@ +*Edge* + +* Added that ActiveRecord::Base.exists? can be called with no arguments #1817 [Scott Taylor] + + *2.3.0 [RC1] (February 1st, 2009)* * Add Support for updating deeply nested models from a single form. #1202 [Eloy Duran] diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb index f9168c8dc2..9f9fbd8b37 100755 --- a/activerecord/lib/active_record/base.rb +++ b/activerecord/lib/active_record/base.rb @@ -663,7 +663,7 @@ module ActiveRecord #:nodoc: # Returns true if a record exists in the table that matches the +id+ or - # conditions given, or false otherwise. The argument can take four forms: + # conditions given, or false otherwise. The argument can take five forms: # # * Integer - Finds the record with this primary key. # * String - Finds the record with a primary key corresponding to this @@ -672,6 +672,7 @@ module ActiveRecord #:nodoc: # (such as <tt>['color = ?', 'red']</tt>). # * Hash - Finds the record that matches these +find+-style conditions # (such as <tt>{:color => 'red'}</tt>). + # * No args - Returns false if the table is empty, true otherwise. # # For more information about specifying conditions as a Hash or Array, # see the Conditions section in the introduction to ActiveRecord::Base. @@ -685,7 +686,8 @@ module ActiveRecord #:nodoc: # Person.exists?('5') # Person.exists?(:name => "David") # Person.exists?(['name LIKE ?', "%#{query}%"]) - def exists?(id_or_conditions) + # Person.exists? + def exists?(id_or_conditions = {}) connection.select_all( construct_finder_sql( :select => "#{quoted_table_name}.#{primary_key}", diff --git a/activerecord/test/cases/finder_test.rb b/activerecord/test/cases/finder_test.rb index 7fd7fd7a5b..aac5e6a96b 100644 --- a/activerecord/test/cases/finder_test.rb +++ b/activerecord/test/cases/finder_test.rb @@ -94,7 +94,16 @@ class FinderTest < ActiveRecord::TestCase assert_raise(NoMethodError) { Topic.exists?([1,2]) } end - + + def test_exists_returns_true_with_one_record_and_no_args + assert Topic.exists? + end + + def test_does_not_exist_with_empty_table_and_no_args_given + Topic.delete_all + assert !Topic.exists? + end + def test_exists_with_aggregate_having_three_mappings existing_address = customers(:david).address assert Customer.exists?(:address => existing_address) |