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[depot.git] / vendor / rails / activerecord / lib / active_record / associations / has_many_association.rb

diff --git a/vendor/rails/activerecord/lib/active_record/associations/has_many_association.rb b/vendor/rails/activerecord/lib/active_record/associations/has_many_association.rb
new file mode 100644 (file)
index 0000000..3348079
--- /dev/null
+++ b/vendor/rails/activerecord/lib/active_record/associations/has_many_association.rb
@@ -0,0 +1,121 @@
+module ActiveRecord
+  module Associations
+    # This is the proxy that handles a has many association.
+    #
+    # If the association has a <tt>:through</tt> option further specialization
+    # is provided by its child HasManyThroughAssociation.
+    class HasManyAssociation < AssociationCollection #:nodoc:
+      protected
+        def owner_quoted_id
+          if @reflection.options[:primary_key]
+            quote_value(@owner.send(@reflection.options[:primary_key]))
+          else
+            @owner.quoted_id
+          end
+        end
+
+        # Returns the number of records in this collection.
+        #
+        # If the association has a counter cache it gets that value. Otherwise
+        # it will attempt to do a count via SQL, bounded to <tt>:limit</tt> if
+        # there's one.  Some configuration options like :group make it impossible
+        # to do a SQL count, in those cases the array count will be used.
+        #
+        # That does not depend on whether the collection has already been loaded
+        # or not. The +size+ method is the one that takes the loaded flag into
+        # account and delegates to +count_records+ if needed.
+        #
+        # If the collection is empty the target is set to an empty array and
+        # the loaded flag is set to true as well.
+        def count_records
+          count = if has_cached_counter?
+            @owner.send(:read_attribute, cached_counter_attribute_name)
+          elsif @reflection.options[:counter_sql]
+            @reflection.klass.count_by_sql(@counter_sql)
+          else
+            @reflection.klass.count(:conditions => @counter_sql, :include => @reflection.options[:include])
+          end
+
+          # If there's nothing in the database and @target has no new records
+          # we are certain the current target is an empty array. This is a
+          # documented side-effect of the method that may avoid an extra SELECT.
+          @target ||= [] and loaded if count == 0
+          
+          if @reflection.options[:limit]
+            count = [ @reflection.options[:limit], count ].min
+          end
+          
+          return count
+        end
+
+        def has_cached_counter?
+          @owner.attribute_present?(cached_counter_attribute_name)
+        end
+
+        def cached_counter_attribute_name
+          "#{@reflection.name}_count"
+        end
+
+        def insert_record(record)
+          set_belongs_to_association_for(record)
+          record.save
+        end
+
+        # Deletes the records according to the <tt>:dependent</tt> option.
+        def delete_records(records)
+          case @reflection.options[:dependent]
+            when :destroy
+              records.each { |r| r.destroy }
+            when :delete_all
+              @reflection.klass.delete(records.map { |record| record.id })
+            else
+              ids = quoted_record_ids(records)
+              @reflection.klass.update_all(
+                "#{@reflection.primary_key_name} = NULL", 
+                "#{@reflection.primary_key_name} = #{owner_quoted_id} AND #{@reflection.klass.primary_key} IN (#{ids})"
+              )
+          end
+        end
+
+        def target_obsolete?
+          false
+        end
+
+        def construct_sql
+          case
+            when @reflection.options[:finder_sql]
+              @finder_sql = interpolate_sql(@reflection.options[:finder_sql])
+
+            when @reflection.options[:as]
+              @finder_sql = 
+                "#{@reflection.quoted_table_name}.#{@reflection.options[:as]}_id = #{owner_quoted_id} AND " +
+                "#{@reflection.quoted_table_name}.#{@reflection.options[:as]}_type = #{@owner.class.quote_value(@owner.class.base_class.name.to_s)}"
+              @finder_sql << " AND (#{conditions})" if conditions
+            
+            else
+              @finder_sql = "#{@reflection.quoted_table_name}.#{@reflection.primary_key_name} = #{owner_quoted_id}"
+              @finder_sql << " AND (#{conditions})" if conditions
+          end
+
+          if @reflection.options[:counter_sql]
+            @counter_sql = interpolate_sql(@reflection.options[:counter_sql])
+          elsif @reflection.options[:finder_sql]
+            # replace the SELECT clause with COUNT(*), preserving any hints within /* ... */
+            @reflection.options[:counter_sql] = @reflection.options[:finder_sql].sub(/SELECT (\/\*.*?\*\/ )?(.*)\bFROM\b/im) { "SELECT #{$1}COUNT(*) FROM" }
+            @counter_sql = interpolate_sql(@reflection.options[:counter_sql])
+          else
+            @counter_sql = @finder_sql
+          end
+        end
+
+        def construct_scope
+          create_scoping = {}
+          set_belongs_to_association_for(create_scoping)
+          {
+            :find => { :conditions => @finder_sql, :readonly => false, :order => @reflection.options[:order], :limit => @reflection.options[:limit], :include => @reflection.options[:include]},
+            :create => create_scoping
+          }
+        end
+    end
+  end
+end