Revert "Merge pull request #7983 from georgebrock/bug7950-squashed"

This reverts commit 88a296dccc401da143d90cad54b693ff06bf2b58, reversing
changes made to 666a7e34f553cef4c8878362eafc79c7e3f310c3.

Conflicts:
	activerecord/CHANGELOG.md

Reason: this has been resulting in some hard to track bugs and is
introducing a possible breackage in a stable version.

6 files changed, 12 insertions, 35 deletions

diff --git a/activerecord/lib/active_record/associations/association_scope.rb b/activerecord/lib/active_record/associations/association_scope.rb
index 226639ad37..f9cffa40c8 100644
--- a/activerecord/lib/active_record/associations/association_scope.rb
+++ b/activerecord/lib/active_record/associations/association_scope.rb
@@ -33,18 +33,6 @@ module ActiveRecord
 
       private
 
-      def column_for(table_name, column_name)
-        columns = alias_tracker.connection.schema_cache.columns_hash[table_name]
-        columns[column_name]
-      end
-
-      def bind(scope, column, value)
-        substitute = alias_tracker.connection.substitute_at(
-          column, scope.bind_values.length)
-        scope.bind_values += [[column, value]]
-        substitute
-      end
-
       def add_constraints(scope)
         tables = construct_tables
 
@@ -79,9 +67,7 @@ module ActiveRecord
           conditions = self.conditions[i]
 
           if reflection == chain.last
-            column = column_for(table.table_name, key.to_s)
-            bind_val = bind(scope, column, owner[foreign_key])
-            scope = scope.where(table[key].eq(bind_val))
+            scope = scope.where(table[key].eq(owner[foreign_key]))
 
             if reflection.type
               scope = scope.where(table[reflection.type].eq(owner.class.base_class.name))
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
index c49aed7069..acdacfc97f 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
@@ -21,14 +21,14 @@ module ActiveRecord
 
       # Returns a record hash with the column names as keys and column values
       # as values.
-      def select_one(arel, name = nil, binds = [])
-        result = select_all(arel, name, binds)
+      def select_one(arel, name = nil)
+        result = select_all(arel, name)
         result.first if result
       end
 
       # Returns a single value from a record
-      def select_value(arel, name = nil, binds = [])
-        if result = select_one(arel, name, binds)
+      def select_value(arel, name = nil)
+        if result = select_one(arel, name)
           result.values.first
         end
       end
diff --git a/activerecord/lib/active_record/relation.rb b/activerecord/lib/active_record/relation.rb
index a727f40194..4b3b30d6ed 100644
--- a/activerecord/lib/active_record/relation.rb
+++ b/activerecord/lib/active_record/relation.rb
@@ -464,12 +464,7 @@ module ActiveRecord
         node.left.relation.name == table_name
       }
 
-      binds = Hash[bind_values.find_all(&:first).map { |column, v| [column.name, v] }]
-
-      Hash[equalities.map { |where|
-        name = where.left.name
-        [name, binds.fetch(name.to_s) { where.right }]
-      }]
+      Hash[equalities.map { |where| [where.left.name, where.right] }]
     end
 
     def scope_for_create
diff --git a/activerecord/lib/active_record/relation/calculations.rb b/activerecord/lib/active_record/relation/calculations.rb
index 20c5fa03a2..ceacf93b60 100644
--- a/activerecord/lib/active_record/relation/calculations.rb
+++ b/activerecord/lib/active_record/relation/calculations.rb
@@ -185,7 +185,7 @@ module ActiveRecord
 
       relation = clone
       relation.select_values = [column_name]
-      klass.connection.select_all(relation.arel, nil, bind_values).map! do |attributes|
+      klass.connection.select_all(relation.arel).map! do |attributes|
         klass.type_cast_attribute(attributes.keys.first, klass.initialize_attributes(attributes))
       end
     end
@@ -247,8 +247,7 @@ module ActiveRecord
         query_builder = relation.arel
       end
 
-      result = @klass.connection.select_value(query_builder, nil, relation.bind_values)
-      type_cast_calculated_value(result, column_for(column_name), operation)
+      type_cast_calculated_value(@klass.connection.select_value(query_builder), column_for(column_name), operation)
     end
 
     def execute_grouped_calculation(operation, column_name, distinct) #:nodoc:
@@ -294,7 +293,7 @@ module ActiveRecord
       relation = except(:group).group(group)
       relation.select_values = select_values
 
-      calculated_data = @klass.connection.select_all(relation, nil, bind_values)
+      calculated_data = @klass.connection.select_all(relation)
 
       if association
         key_ids     = calculated_data.collect { |row| row[group_aliases.first] }
diff --git a/activerecord/lib/active_record/relation/finder_methods.rb b/activerecord/lib/active_record/relation/finder_methods.rb
index cbb2f676c8..08cfe4f70d 100644
--- a/activerecord/lib/active_record/relation/finder_methods.rb
+++ b/activerecord/lib/active_record/relation/finder_methods.rb
@@ -199,7 +199,7 @@ module ActiveRecord
         relation = relation.where(table[primary_key].eq(id)) if id
       end
 
-      connection.select_value(relation, "#{name} Exists", relation.bind_values) ? true : false
+      connection.select_value(relation, "#{name} Exists") ? true : false
     rescue ThrowResult
       false
     end
@@ -334,7 +334,7 @@ module ActiveRecord
 
       substitute = connection.substitute_at(column, @bind_values.length)
       relation = where(table[primary_key].eq(substitute))
-      relation.bind_values += [[column, id]]
+      relation.bind_values = [[column, id]]
       record = relation.first
 
       unless record
diff --git a/activerecord/lib/active_record/relation/spawn_methods.rb b/activerecord/lib/active_record/relation/spawn_methods.rb
index 3eead56e47..c25570d758 100644
--- a/activerecord/lib/active_record/relation/spawn_methods.rb
+++ b/activerecord/lib/active_record/relation/spawn_methods.rb
@@ -22,7 +22,7 @@ module ActiveRecord
         end
       end
 
-      (Relation::MULTI_VALUE_METHODS - [:joins, :where, :order, :binds]).each do |method|
+      (Relation::MULTI_VALUE_METHODS - [:joins, :where, :order]).each do |method|
         value = r.send(:"#{method}_values")
         merged_relation.send(:"#{method}_values=", merged_relation.send(:"#{method}_values") + value) if value.present?
       end
@@ -31,8 +31,6 @@ module ActiveRecord
 
       merged_wheres = @where_values + r.where_values
 
-      merged_binds = (@bind_values + r.bind_values).uniq(&:first)
-
       unless @where_values.empty?
         # Remove duplicates, last one wins.
         seen = Hash.new { |h,table| h[table] = {} }
@@ -49,7 +47,6 @@ module ActiveRecord
       end
 
       merged_relation.where_values = merged_wheres
-      merged_relation.bind_values = merged_binds
 
       (Relation::SINGLE_VALUE_METHODS - [:lock, :create_with, :reordering]).each do |method|
         value = r.send(:"#{method}_value")