X-Git-Url: https://git.njae.me.uk/?a=blobdiff_plain;f=vendor%2Frails%2Factiverecord%2Flib%2Factive_record%2Fassociations%2Fhas_many_through_association.rb;fp=vendor%2Frails%2Factiverecord%2Flib%2Factive_record%2Fassociations%2Fhas_many_through_association.rb;h=a0bb3a45b0b50461faf4e30c3a20ebb0582fbeb3;hb=d115f2e23823271635bad69229a42cd8ac68debe;hp=0000000000000000000000000000000000000000;hpb=37cb670bf3ddde90b214e591f100ed4446469484;p=depot.git

diff --git a/vendor/rails/activerecord/lib/active_record/associations/has_many_through_association.rb b/vendor/rails/activerecord/lib/active_record/associations/has_many_through_association.rb
new file mode 100644
index 0000000..a0bb3a4
--- /dev/null
+++ b/vendor/rails/activerecord/lib/active_record/associations/has_many_through_association.rb
@@ -0,0 +1,256 @@
+module ActiveRecord
+  module Associations
+    class HasManyThroughAssociation < HasManyAssociation #:nodoc:
+      def initialize(owner, reflection)
+        reflection.check_validity!
+        super
+      end
+
+      alias_method :new, :build
+
+      def create!(attrs = nil)
+        transaction do
+          self << (object = attrs ? @reflection.klass.send(:with_scope, :create => attrs) { @reflection.create_association! } : @reflection.create_association!)
+          object
+        end
+      end
+
+      def create(attrs = nil)
+        transaction do
+          self << (object = attrs ? @reflection.klass.send(:with_scope, :create => attrs) { @reflection.create_association } : @reflection.create_association)
+          object
+        end
+      end
+
+      # Returns the size of the collection by executing a SELECT COUNT(*) query if the collection hasn't been loaded and
+      # calling collection.size if it has. If it's more likely than not that the collection does have a size larger than zero
+      # and you need to fetch that collection afterwards, it'll take one less SELECT query if you use length.
+      def size
+        return @owner.send(:read_attribute, cached_counter_attribute_name) if has_cached_counter?
+        return @target.size if loaded?
+        return count
+      end
+      
+      protected
+        def target_reflection_has_associated_record?
+          if @reflection.through_reflection.macro == :belongs_to && @owner[@reflection.through_reflection.primary_key_name].blank?
+            false
+          else
+            true
+          end
+        end
+
+        def construct_find_options!(options)
+          options[:select]  = construct_select(options[:select])
+          options[:from]  ||= construct_from
+          options[:joins]   = construct_joins(options[:joins])
+          options[:include] = @reflection.source_reflection.options[:include] if options[:include].nil?
+        end
+        
+        def insert_record(record, force=true)
+          if record.new_record?
+            if force
+              record.save!
+            else
+              return false unless record.save
+            end
+          end
+          through_reflection = @reflection.through_reflection
+          klass = through_reflection.klass
+          @owner.send(@reflection.through_reflection.name).proxy_target << klass.send(:with_scope, :create => construct_join_attributes(record)) { through_reflection.create_association! }
+        end
+
+        # TODO - add dependent option support
+        def delete_records(records)
+          klass = @reflection.through_reflection.klass
+          records.each do |associate|
+            klass.delete_all(construct_join_attributes(associate))
+          end
+        end
+
+        def find_target
+          return [] unless target_reflection_has_associated_record?
+          @reflection.klass.find(:all,
+            :select     => construct_select,
+            :conditions => construct_conditions,
+            :from       => construct_from,
+            :joins      => construct_joins,
+            :order      => @reflection.options[:order],
+            :limit      => @reflection.options[:limit],
+            :group      => @reflection.options[:group],
+            :readonly   => @reflection.options[:readonly],
+            :include    => @reflection.options[:include] || @reflection.source_reflection.options[:include]
+          )
+        end
+
+        # Construct attributes for associate pointing to owner.
+        def construct_owner_attributes(reflection)
+          if as = reflection.options[:as]
+            { "#{as}_id" => @owner.id,
+              "#{as}_type" => @owner.class.base_class.name.to_s }
+          else
+            { reflection.primary_key_name => @owner.id }
+          end
+        end
+
+        # Construct attributes for :through pointing to owner and associate.
+        def construct_join_attributes(associate)
+          # TODO: revist this to allow it for deletion, supposing dependent option is supported
+          raise ActiveRecord::HasManyThroughCantAssociateThroughHasManyReflection.new(@owner, @reflection) if @reflection.source_reflection.macro == :has_many
+          join_attributes = construct_owner_attributes(@reflection.through_reflection).merge(@reflection.source_reflection.primary_key_name => associate.id)
+          if @reflection.options[:source_type]
+            join_attributes.merge!(@reflection.source_reflection.options[:foreign_type] => associate.class.base_class.name.to_s)
+          end
+          join_attributes
+        end
+
+        # Associate attributes pointing to owner, quoted.
+        def construct_quoted_owner_attributes(reflection)
+          if as = reflection.options[:as]
+            { "#{as}_id" => owner_quoted_id,
+              "#{as}_type" => reflection.klass.quote_value(
+                @owner.class.base_class.name.to_s,
+                reflection.klass.columns_hash["#{as}_type"]) }
+          elsif reflection.macro == :belongs_to
+            { reflection.klass.primary_key => @owner[reflection.primary_key_name] }
+          else
+            { reflection.primary_key_name => owner_quoted_id }
+          end
+        end
+
+        # Build SQL conditions from attributes, qualified by table name.
+        def construct_conditions
+          table_name = @reflection.through_reflection.quoted_table_name
+          conditions = construct_quoted_owner_attributes(@reflection.through_reflection).map do |attr, value|
+            "#{table_name}.#{attr} = #{value}"
+          end
+          conditions << sql_conditions if sql_conditions
+          "(" + conditions.join(') AND (') + ")"
+        end
+
+        def construct_from
+          @reflection.quoted_table_name
+        end
+
+        def construct_select(custom_select = nil)
+          distinct = "DISTINCT " if @reflection.options[:uniq]
+          selected = custom_select || @reflection.options[:select] || "#{distinct}#{@reflection.quoted_table_name}.*"
+        end
+
+        def construct_joins(custom_joins = nil)
+          polymorphic_join = nil
+          if @reflection.source_reflection.macro == :belongs_to
+            reflection_primary_key = @reflection.klass.primary_key
+            source_primary_key     = @reflection.source_reflection.primary_key_name
+            if @reflection.options[:source_type]
+              polymorphic_join = "AND %s.%s = %s" % [
+                @reflection.through_reflection.quoted_table_name, "#{@reflection.source_reflection.options[:foreign_type]}",
+                @owner.class.quote_value(@reflection.options[:source_type])
+              ]
+            end
+          else
+            reflection_primary_key = @reflection.source_reflection.primary_key_name
+            source_primary_key     = @reflection.klass.primary_key
+            if @reflection.source_reflection.options[:as]
+              polymorphic_join = "AND %s.%s = %s" % [
+                @reflection.quoted_table_name, "#{@reflection.source_reflection.options[:as]}_type",
+                @owner.class.quote_value(@reflection.through_reflection.klass.name)
+              ]
+            end
+          end
+
+          "INNER JOIN %s ON %s.%s = %s.%s %s #{@reflection.options[:joins]} #{custom_joins}" % [
+            @reflection.through_reflection.table_name,
+            @reflection.table_name, reflection_primary_key,
+            @reflection.through_reflection.table_name, source_primary_key,
+            polymorphic_join
+          ]
+        end
+
+        def construct_scope
+          { :create => construct_owner_attributes(@reflection),
+            :find   => { :from        => construct_from,
+                         :conditions  => construct_conditions,
+                         :joins       => construct_joins,
+                         :include     => @reflection.options[:include],
+                         :select      => construct_select,
+                         :order       => @reflection.options[:order],
+                         :limit       => @reflection.options[:limit],
+                         :readonly    => @reflection.options[:readonly],
+             } }
+        end
+
+        def construct_sql
+          case
+            when @reflection.options[:finder_sql]
+              @finder_sql = interpolate_sql(@reflection.options[:finder_sql])
+
+              @finder_sql = "#{@reflection.quoted_table_name}.#{@reflection.primary_key_name} = #{owner_quoted_id}"
+              @finder_sql << " AND (#{conditions})" if conditions
+            else
+              @finder_sql = construct_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 conditions
+          @conditions = build_conditions unless defined?(@conditions)
+          @conditions
+        end
+
+        def build_conditions
+          association_conditions = @reflection.options[:conditions]
+          through_conditions = build_through_conditions
+          source_conditions = @reflection.source_reflection.options[:conditions]
+          uses_sti = !@reflection.through_reflection.klass.descends_from_active_record?
+
+          if association_conditions || through_conditions || source_conditions || uses_sti
+            all = []
+
+            [association_conditions, source_conditions].each do |conditions|
+              all << interpolate_sql(sanitize_sql(conditions)) if conditions
+            end
+
+            all << through_conditions  if through_conditions
+            all << build_sti_condition if uses_sti
+
+            all.map { |sql| "(#{sql})" } * ' AND '
+          end
+        end
+
+        def build_through_conditions
+          conditions = @reflection.through_reflection.options[:conditions]
+          if conditions.is_a?(Hash)
+            interpolate_sql(sanitize_sql(conditions)).gsub(
+              @reflection.quoted_table_name,
+              @reflection.through_reflection.quoted_table_name)
+          elsif conditions
+            interpolate_sql(sanitize_sql(conditions))
+          end
+        end
+        
+        def build_sti_condition
+          @reflection.through_reflection.klass.send(:type_condition)
+        end
+
+        alias_method :sql_conditions, :conditions
+
+        def has_cached_counter?
+          @owner.attribute_present?(cached_counter_attribute_name)
+        end
+
+        def cached_counter_attribute_name
+          "#{@reflection.name}_count"
+        end
+    end
+  end
+end