Allow conditions on multiple tables to be specified using hash.

Examples:

  User.all :joins => :items, :conditions => { :age => 10, :items => { :color => 'black' } }
  Item.first :conditions => { :items => { :color => 'red' } }

Note : Hash key in :conditions is referring to the actual table name or the alias defined in query.

activerecord/CHANGELOG

@@ -1,5 +1,10 @@
 *Edge*
 
+* Allow conditions on multiple tables to be specified using hash. [Pratik Naik]. Example:
+
+  User.all :joins => :items, :conditions => { :age => 10, :items => { :color => 'black' } }
+  Item.first :conditions => { :items => { :color => 'red' } }
+
 * Always treat integer :limit as byte length.  #420 [Tarmo Tänav]
 
 * Partial updates don't update lock_version if nothing changed.  #426 [Daniel Morrison]

activerecord/lib/active_record/base.rb

@@ -1999,24 +1999,28 @@ module ActiveRecord #:nodoc:
         #     # => "age BETWEEN 13 AND 18"
         #   { 'other_records.id' => 7 }
         #     # => "`other_records`.`id` = 7"
+        #   { :other_records => { :id => 7 } }
+        #     # => "`other_records`.`id` = 7"
         # And for value objects on a composed_of relationship:
         #   { :address => Address.new("123 abc st.", "chicago") }
         #     # => "address_street='123 abc st.' and address_city='chicago'"
-        def sanitize_sql_hash_for_conditions(attrs)
+        def sanitize_sql_hash_for_conditions(attrs, table_name = quoted_table_name)
           attrs = expand_hash_conditions_for_aggregates(attrs)
 
           conditions = attrs.map do |attr, value|
-            attr = attr.to_s
+            unless value.is_a?(Hash)
+              attr = attr.to_s
 
-            # Extract table name from qualified attribute names.
-            if attr.include?('.')
-              table_name, attr = attr.split('.', 2)
-              table_name = connection.quote_table_name(table_name)
+              # Extract table name from qualified attribute names.
+              if attr.include?('.')
+                table_name, attr = attr.split('.', 2)
+                table_name = connection.quote_table_name(table_name)
+              end
+
+              "#{table_name}.#{connection.quote_column_name(attr)} #{attribute_condition(value)}"
             else
-              table_name = quoted_table_name
+              sanitize_sql_hash_for_conditions(value, connection.quote_table_name(attr.to_s))
             end
-
-            "#{table_name}.#{connection.quote_column_name(attr)} #{attribute_condition(value)}"
           end.join(' AND ')
 
           replace_bind_variables(conditions, expand_range_bind_variables(attrs.values))
@@ -2070,6 +2074,8 @@ module ActiveRecord #:nodoc:
           expanded = []
 
           bind_vars.each do |var|
+            next if var.is_a?(Hash)
+
             if var.is_a?(Range)
               expanded << var.first
               expanded << var.last

activerecord/test/cases/finder_test.rb

@@ -200,6 +200,23 @@ class FinderTest < ActiveRecord::TestCase
     assert_raises(ActiveRecord::RecordNotFound) { Topic.find(1, :conditions => { 'topics.approved' => true }) }
   end
 
+  def test_find_on_hash_conditions_with_hashed_table_name
+    assert Topic.find(1, :conditions => {:topics => { :approved => false }})
+    assert_raises(ActiveRecord::RecordNotFound) { Topic.find(1, :conditions => {:topics => { :approved => true }}) }
+  end
+
+  def test_find_with_hash_conditions_on_joined_table
+    firms = Firm.all :joins => :account, :conditions => {:accounts => { :credit_limit => 50 }}
+    assert_equal 1, firms.size
+    assert_equal companies(:first_firm), firms.first
+  end
+
+  def test_find_with_hash_conditions_on_joined_table_and_with_range
+    firms = DependentFirm.all :joins => :account, :conditions => {:name => 'RailsCore', :accounts => { :credit_limit => 55..60 }}
+    assert_equal 1, firms.size
+    assert_equal companies(:rails_core), firms.first
+  end
+
   def test_find_on_hash_conditions_with_explicit_table_name_and_aggregate
     david = customers(:david)
     assert Customer.find(david.id, :conditions => { 'customers.name' => david.name, :address => david.address })