Add interpolation of association conditions back in, in the form of proc { ... } rather than instance_eval-ing strings

18 files changed, 97 insertions, 47 deletions

diff --git a/activerecord/CHANGELOG b/activerecord/CHANGELOG
index e49915a8cd..72bbeeec61 100644
--- a/activerecord/CHANGELOG
+++ b/activerecord/CHANGELOG
@@ -50,8 +50,27 @@
   (for example, add_name_to_users) use the reversible migration's `change`
   method instead of the ordinary `up` and `down` methods. [Prem Sichanugrist]
 
-* Removed support for interpolated SQL conditions.  Please use scoping
-along with attribute conditionals as a replacement.
+* Removed support for interpolating string SQL conditions on associations. Instead, you should
+  use a proc, like so:
+
+  Before:
+
+    has_many :things, :conditions => 'foo = #{bar}'
+
+  After:
+
+    has_many :things, :conditions => proc { "foo = #{bar}" }
+
+  Inside the proc, 'self' is the object which is the owner of the association, unless you are
+  eager loading the association, in which case 'self' is the class which the association is within.
+
+  You can have any "normal" conditions inside the proc, so the following will work too:
+
+    has_many :things, :conditions => proc { ["foo = ?", bar] }
+
+  Previously :insert_sql and :delete_sql on has_and_belongs_to_many association allowed you to call
+  'record' to get the record being inserted or deleted. This is now passed as an argument to
+  the proc.
 
 * Added ActiveRecord::Base#has_secure_password (via ActiveModel::SecurePassword) to encapsulate dead-simple password usage with BCrypt encryption and salting [DHH]. Example:
 
diff --git a/activerecord/lib/active_record/association_preload.rb b/activerecord/lib/active_record/association_preload.rb
index b83c00e9f8..52d2c49836 100644
--- a/activerecord/lib/active_record/association_preload.rb
+++ b/activerecord/lib/active_record/association_preload.rb
@@ -399,10 +399,18 @@ module ActiveRecord
         end
       end
 
+      def process_conditions(conditions, klass = self)
+        if conditions.respond_to?(:to_proc)
+          conditions = instance_eval(&conditions)
+        end
+
+        klass.send(:sanitize_sql, conditions)
+      end
+
       def append_conditions(reflection, preload_options)
         [
-          ("(#{reflection.sanitized_conditions})" if reflection.sanitized_conditions),
-          ("(#{sanitize_sql preload_options[:conditions]})" if preload_options[:conditions]),
+          ('(' + process_conditions(reflection.options[:conditions], reflection.klass) + ')' if reflection.options[:conditions]),
+          ('(' + process_conditions(preload_options[:conditions]) + ')' if preload_options[:conditions]),
         ].compact.map { |x| Arel.sql x }
       end
 
diff --git a/activerecord/lib/active_record/associations/association_collection.rb b/activerecord/lib/active_record/associations/association_collection.rb
index 3e3237c348..8e006e4d9d 100644
--- a/activerecord/lib/active_record/associations/association_collection.rb
+++ b/activerecord/lib/active_record/associations/association_collection.rb
@@ -374,17 +374,15 @@ module ActiveRecord
 
         def custom_counter_sql
           if @reflection.options[:counter_sql]
-            counter_sql = @reflection.options[:counter_sql]
+            interpolate(@reflection.options[:counter_sql])
           else
             # replace the SELECT clause with COUNT(*), preserving any hints within /* ... */
-            counter_sql = @reflection.options[:finder_sql].sub(/SELECT\b(\/\*.*?\*\/ )?(.*)\bFROM\b/im) { "SELECT #{$1}COUNT(*) FROM" }
+            interpolate(@reflection.options[:finder_sql]).sub(/SELECT\b(\/\*.*?\*\/ )?(.*)\bFROM\b/im) { "SELECT #{$1}COUNT(*) FROM" }
           end
-
-          interpolate_sql(counter_sql)
         end
 
         def custom_finder_sql
-          interpolate_sql(@reflection.options[:finder_sql])
+          interpolate(@reflection.options[:finder_sql])
         end
 
         def find_target
diff --git a/activerecord/lib/active_record/associations/association_proxy.rb b/activerecord/lib/active_record/associations/association_proxy.rb
index 2832f49c23..fc03a4b619 100644
--- a/activerecord/lib/active_record/associations/association_proxy.rb
+++ b/activerecord/lib/active_record/associations/association_proxy.rb
@@ -184,7 +184,8 @@ module ActiveRecord
         def association_scope
           scope = target_klass.unscoped
           scope = scope.create_with(creation_attributes)
-          scope = scope.apply_finder_options(@reflection.options.slice(:conditions, :readonly, :include))
+          scope = scope.apply_finder_options(@reflection.options.slice(:readonly, :include))
+          scope = scope.where(interpolate(@reflection.options[:conditions]))
           if select = select_value
             scope = scope.select(select)
           end
@@ -240,8 +241,12 @@ module ActiveRecord
           !loaded? && (!@owner.new_record? || foreign_key_present?) && target_klass
         end
 
-        def interpolate_sql(sql, record = nil)
-          @owner.send(:interpolate_sql, sql, record)
+        def interpolate(sql, record = nil)
+          if sql.respond_to?(:to_proc)
+            @owner.send(:instance_exec, record, &sql)
+          else
+            sql
+          end
         end
 
         def select_value
diff --git a/activerecord/lib/active_record/associations/class_methods/join_dependency/join_association.rb b/activerecord/lib/active_record/associations/class_methods/join_dependency/join_association.rb
index 856d826d67..aaa475109e 100644
--- a/activerecord/lib/active_record/associations/class_methods/join_dependency/join_association.rb
+++ b/activerecord/lib/active_record/associations/class_methods/join_dependency/join_association.rb
@@ -108,6 +108,10 @@ module ActiveRecord
           end
 
           def process_conditions(conditions, table_name)
+            if conditions.respond_to?(:to_proc)
+              conditions = instance_eval(&conditions)
+            end
+
             Arel.sql(sanitize_sql(conditions, table_name))
           end
 
diff --git a/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb b/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb
index b0ccab2de6..b5ec45159b 100644
--- a/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb
+++ b/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb
@@ -17,7 +17,7 @@ module ActiveRecord
           end
 
           if @reflection.options[:insert_sql]
-            @owner.connection.insert(interpolate_sql(@reflection.options[:insert_sql], record))
+            @owner.connection.insert(interpolate(@reflection.options[:insert_sql], record))
           else
             stmt = join_table.compile_insert(
               join_table[@reflection.foreign_key]             => @owner.id,
@@ -42,7 +42,7 @@ module ActiveRecord
 
         def delete_records(records, method)
           if sql = @reflection.options[:delete_sql]
-            records.each { |record| @owner.connection.delete(interpolate_sql(sql, record)) }
+            records.each { |record| @owner.connection.delete(interpolate(sql, record)) }
           else
             relation = join_table
             stmt = relation.where(relation[@reflection.foreign_key].eq(@owner.id).
diff --git a/activerecord/lib/active_record/associations/through_association.rb b/activerecord/lib/active_record/associations/through_association.rb
index ab593d09b9..0550bae408 100644
--- a/activerecord/lib/active_record/associations/through_association.rb
+++ b/activerecord/lib/active_record/associations/through_association.rb
@@ -119,14 +119,14 @@ module ActiveRecord
             scope = scope.where(@reflection.through_reflection.klass.send(:type_condition))
           end
 
-          scope = scope.where(@reflection.source_reflection.options[:conditions])
+          scope = scope.where(interpolate(@reflection.source_reflection.options[:conditions]))
           scope.where(through_conditions)
         end
 
         # If there is a hash of conditions then we make sure the keys are scoped to the
         # through table name if left ambiguous.
         def through_conditions
-          conditions = @reflection.through_reflection.options[:conditions]
+          conditions = interpolate(@reflection.through_reflection.options[:conditions])
 
           if conditions.is_a?(Hash)
             Hash[conditions.map { |key, value|
diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index 16bdd7bb58..3d48ab89ac 100644
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -1790,12 +1790,6 @@ MSG
         self.class.connection.quote(value, column)
       end
 
-      # Interpolate custom SQL string in instance context.
-      # Optional record argument is meant for custom insert_sql.
-      def interpolate_sql(sql, record = nil)
-        instance_eval("%@#{sql.gsub('@', '\@')}@", __FILE__, __LINE__)
-      end
-
       # Instantiates objects for all attribute classes that needs more than one constructor parameter. This is done
       # by calling new on the column type or aggregation type (through composed_of) object with these parameters.
       # So having the pairs written_on(1) = "2004", written_on(2) = "6", written_on(3) = "24", will instantiate
diff --git a/activerecord/test/cases/associations/eager_test.rb b/activerecord/test/cases/associations/eager_test.rb
index 3074648d59..42dd612083 100644
--- a/activerecord/test/cases/associations/eager_test.rb
+++ b/activerecord/test/cases/associations/eager_test.rb
@@ -668,6 +668,14 @@ class EagerAssociationTest < ActiveRecord::TestCase
     assert_equal people(:david, :susan), Person.find(:all, :include => [:readers, :primary_contact, :number1_fan], :conditions => "number1_fans_people.first_name like 'M%'", :order => 'people.id', :limit => 2, :offset => 0)
   end
 
+  def test_preload_with_interpolation
+    post = Post.includes(:comments_with_interpolated_conditions).find(posts(:welcome).id)
+    assert_equal [comments(:greetings)], post.comments_with_interpolated_conditions
+
+    post = Post.joins(:comments_with_interpolated_conditions).find(posts(:welcome).id)
+    assert_equal [comments(:greetings)], post.comments_with_interpolated_conditions
+  end
+
   def test_polymorphic_type_condition
     post = Post.find(posts(:thinking).id, :include => :taggings)
     assert post.taggings.include?(taggings(:thinking_general))
diff --git a/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb b/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb
index 5dd2c9861e..dc382c3007 100644
--- a/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb
+++ b/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb
@@ -72,7 +72,7 @@ class DeveloperWithCounterSQL < ActiveRecord::Base
     :join_table => "developers_projects",
     :association_foreign_key => "project_id",
     :foreign_key => "developer_id",
-    :counter_sql => 'SELECT COUNT(*) AS count_all FROM projects INNER JOIN developers_projects ON projects.id = developers_projects.project_id WHERE developers_projects.developer_id =#{id}'
+    :counter_sql => proc { "SELECT COUNT(*) AS count_all FROM projects INNER JOIN developers_projects ON projects.id = developers_projects.project_id WHERE developers_projects.developer_id =#{id}" }
 end
 
 class HasAndBelongsToManyAssociationsTest < ActiveRecord::TestCase
diff --git a/activerecord/test/cases/associations/has_many_associations_test.rb b/activerecord/test/cases/associations/has_many_associations_test.rb
index 23b777ac6d..ad774eb9ce 100644
--- a/activerecord/test/cases/associations/has_many_associations_test.rb
+++ b/activerecord/test/cases/associations/has_many_associations_test.rb
@@ -279,7 +279,6 @@ class HasManyAssociationsTest < ActiveRecord::TestCase
 
   def test_counting_using_finder_sql
     assert_equal 2, Firm.find(4).clients_using_sql.count
-    assert_equal 2, Firm.find(4).clients_using_multiline_sql.count
   end
 
   def test_belongs_to_sanity
diff --git a/activerecord/test/cases/associations/has_many_through_associations_test.rb b/activerecord/test/cases/associations/has_many_through_associations_test.rb
index c58068ef75..73b1d6c500 100644
--- a/activerecord/test/cases/associations/has_many_through_associations_test.rb
+++ b/activerecord/test/cases/associations/has_many_through_associations_test.rb
@@ -711,4 +711,11 @@ class HasManyThroughAssociationsTest < ActiveRecord::TestCase
     post.author_addresses.delete(address)
     assert post[:author_count].nil?
   end
+
+  def test_interpolated_conditions
+    post = posts(:welcome)
+    assert !post.tags.empty?
+    assert_equal post.tags, post.interpolated_tags
+    assert_equal post.tags, post.interpolated_tags_2
+  end
 end
diff --git a/activerecord/test/cases/associations/has_one_associations_test.rb b/activerecord/test/cases/associations/has_one_associations_test.rb
index dbf6dfe20d..6b73a35905 100644
--- a/activerecord/test/cases/associations/has_one_associations_test.rb
+++ b/activerecord/test/cases/associations/has_one_associations_test.rb
@@ -243,6 +243,14 @@ class HasOneAssociationsTest < ActiveRecord::TestCase
     firm.destroy
   end
 
+  def test_finding_with_interpolated_condition
+    firm = Firm.find(:first)
+    superior = firm.clients.create(:name => 'SuperiorCo')
+    superior.rating = 10
+    superior.save
+    assert_equal 10, firm.clients_with_interpolated_conditions.first.rating
+  end
+
   def test_assignment_before_child_saved
     firm = Firm.find(1)
     firm.account = a = Account.new("credit_limit" => 1000)
diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index 6a61dcdb47..0ad20bb9bc 100644
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -1295,12 +1295,6 @@ class BasicsTest < ActiveRecord::TestCase
     assert_equal res6, res7
   end
 
-  def test_interpolate_sql
-    assert_nothing_raised { Category.new.send(:interpolate_sql, 'foo@bar') }
-    assert_nothing_raised { Category.new.send(:interpolate_sql, 'foo bar) baz') }
-    assert_nothing_raised { Category.new.send(:interpolate_sql, 'foo bar} baz') }
-  end
-
   def test_scoped_find_conditions
     scoped_developers = Developer.send(:with_scope, :find => { :conditions => 'salary > 90000' }) do
       Developer.find(:all, :conditions => 'id < 5')
diff --git a/activerecord/test/models/company.rb b/activerecord/test/models/company.rb
index 3e219fbe4a..e0b30efd51 100644
--- a/activerecord/test/models/company.rb
+++ b/activerecord/test/models/company.rb
@@ -48,19 +48,16 @@ class Firm < Company
   has_many :dependent_clients_of_firm, :foreign_key => "client_of", :class_name => "Client", :order => "id", :dependent => :destroy
   has_many :exclusively_dependent_clients_of_firm, :foreign_key => "client_of", :class_name => "Client", :order => "id", :dependent => :delete_all
   has_many :limited_clients, :class_name => "Client", :limit => 1
+  has_many :clients_with_interpolated_conditions, :class_name => "Client", :conditions => proc { "rating > #{rating}" }
   has_many :clients_like_ms, :conditions => "name = 'Microsoft'", :class_name => "Client", :order => "id"
   has_many :clients_like_ms_with_hash_conditions, :conditions => { :name => 'Microsoft' }, :class_name => "Client", :order => "id"
-  has_many :clients_using_sql, :class_name => "Client", :finder_sql => 'SELECT * FROM companies WHERE client_of = #{id}'
-  has_many :clients_using_multiline_sql, :class_name => "Client", :finder_sql => '
-  SELECT
-  companies.*
-  FROM companies WHERE companies.client_of = #{id}'
+  has_many :clients_using_sql, :class_name => "Client", :finder_sql => proc { "SELECT * FROM companies WHERE client_of = #{id}" }
   has_many :clients_using_counter_sql, :class_name => "Client",
-           :finder_sql  => 'SELECT * FROM companies WHERE client_of = #{id}',
-           :counter_sql => 'SELECT COUNT(*) FROM companies WHERE client_of = #{id}'
+           :finder_sql  => proc { "SELECT * FROM companies WHERE client_of = #{id} " },
+           :counter_sql => proc { "SELECT COUNT(*) FROM companies WHERE client_of = #{id}" }
   has_many :clients_using_zero_counter_sql, :class_name => "Client",
-           :finder_sql  => 'SELECT * FROM companies WHERE client_of = #{id}',
-           :counter_sql => 'SELECT 0 FROM companies WHERE client_of = #{id}'
+           :finder_sql  => proc { "SELECT * FROM companies WHERE client_of = #{id}" },
+           :counter_sql => proc { "SELECT 0 FROM companies WHERE client_of = #{id}" }
   has_many :no_clients_using_counter_sql, :class_name => "Client",
            :finder_sql  => 'SELECT * FROM companies WHERE client_of = 1000',
            :counter_sql => 'SELECT COUNT(*) FROM companies WHERE client_of = 1000'
diff --git a/activerecord/test/models/post.rb b/activerecord/test/models/post.rb
index fd8cd2244a..5f29196790 100644
--- a/activerecord/test/models/post.rb
+++ b/activerecord/test/models/post.rb
@@ -41,6 +41,9 @@ class Post < ActiveRecord::Base
   has_many :author_categorizations, :through => :author, :source => :categorizations
   has_many :author_addresses, :through => :author
 
+  has_many :comments_with_interpolated_conditions, :class_name => 'Comment',
+    :conditions => proc { ["#{"#{aliased_table_name}." rescue ""}body = ?", 'Thank you for the welcome'] }
+
   has_one  :very_special_comment
   has_one  :very_special_comment_with_post, :class_name => "VerySpecialComment", :include => :post
   has_many :special_comments
@@ -57,6 +60,10 @@ class Post < ActiveRecord::Base
     end
   end
 
+  has_many :interpolated_taggings, :class_name => 'Tagging', :as => :taggable, :conditions => proc { "1 = #{1}" }
+  has_many :interpolated_tags, :through => :taggings
+  has_many :interpolated_tags_2, :through => :interpolated_taggings, :source => :tag
+
   has_many :taggings_with_delete_all, :class_name => 'Tagging', :as => :taggable, :dependent => :delete_all
   has_many :taggings_with_destroy, :class_name => 'Tagging', :as => :taggable, :dependent => :destroy
 
diff --git a/activerecord/test/models/project.rb b/activerecord/test/models/project.rb
index 8a53a8f803..efe1ce67da 100644
--- a/activerecord/test/models/project.rb
+++ b/activerecord/test/models/project.rb
@@ -7,14 +7,15 @@ class Project < ActiveRecord::Base
   has_and_belongs_to_many :developers_named_david, :class_name => "Developer", :conditions => "name = 'David'", :uniq => true
   has_and_belongs_to_many :developers_named_david_with_hash_conditions, :class_name => "Developer", :conditions => { :name => 'David' }, :uniq => true
   has_and_belongs_to_many :salaried_developers, :class_name => "Developer", :conditions => "salary > 0"
-  has_and_belongs_to_many :developers_with_finder_sql, :class_name => "Developer", :finder_sql => 'SELECT t.*, j.* FROM developers_projects j, developers t WHERE t.id = j.developer_id AND j.project_id = #{id} ORDER BY t.id'
-  has_and_belongs_to_many :developers_with_multiline_finder_sql, :class_name => "Developer", :finder_sql => '
-    SELECT
-      t.*, j.*
-    FROM
-      developers_projects j,
-      developers t WHERE t.id = j.developer_id AND j.project_id = #{id} ORDER BY t.id'
-  has_and_belongs_to_many :developers_by_sql, :class_name => "Developer", :delete_sql => "DELETE FROM developers_projects WHERE project_id = \#{id} AND developer_id = \#{record.id}"
+  has_and_belongs_to_many :developers_with_finder_sql, :class_name => "Developer", :finder_sql => proc { "SELECT t.*, j.* FROM developers_projects j, developers t WHERE t.id = j.developer_id AND j.project_id = #{id} ORDER BY t.id" }
+  has_and_belongs_to_many :developers_with_multiline_finder_sql, :class_name => "Developer", :finder_sql => proc {
+    "SELECT
+       t.*, j.*
+     FROM
+       developers_projects j,
+       developers t WHERE t.id = j.developer_id AND j.project_id = #{id} ORDER BY t.id"
+  }
+  has_and_belongs_to_many :developers_by_sql, :class_name => "Developer", :delete_sql => proc { |record| "DELETE FROM developers_projects WHERE project_id = #{id} AND developer_id = #{record.id}" }
   has_and_belongs_to_many :developers_with_callbacks, :class_name => "Developer", :before_add => Proc.new {|o, r| o.developers_log << "before_adding#{r.id || '<new>'}"},
                             :after_add => Proc.new {|o, r| o.developers_log << "after_adding#{r.id || '<new>'}"},
                             :before_remove => Proc.new {|o, r| o.developers_log << "before_removing#{r.id}"},
diff --git a/activerecord/test/models/tagging.rb b/activerecord/test/models/tagging.rb
index 33ffc623d7..231d2b5890 100644
--- a/activerecord/test/models/tagging.rb
+++ b/activerecord/test/models/tagging.rb
@@ -6,6 +6,7 @@ class Tagging < ActiveRecord::Base
   belongs_to :tag, :include => :tagging
   belongs_to :super_tag,   :class_name => 'Tag', :foreign_key => 'super_tag_id'
   belongs_to :invalid_tag, :class_name => 'Tag', :foreign_key => 'tag_id'
+  belongs_to :interpolated_tag, :class_name => 'Tag', :foreign_key => :tag_id, :conditions => proc { "1 = #{1}" }
   belongs_to :taggable, :polymorphic => true, :counter_cache => true
   has_many :things, :through => :taggable
 end