diff options
Diffstat (limited to 'activerecord/lib/active_record/relation.rb')
| -rw-r--r-- | activerecord/lib/active_record/relation.rb | 145 |
1 files changed, 104 insertions, 41 deletions
diff --git a/activerecord/lib/active_record/relation.rb b/activerecord/lib/active_record/relation.rb index 745c6cf349..dd78814c6a 100644 --- a/activerecord/lib/active_record/relation.rb +++ b/activerecord/lib/active_record/relation.rb @@ -1,30 +1,32 @@ # -*- coding: utf-8 -*- +require 'arel/collectors/bind' module ActiveRecord # = Active Record Relation class Relation - JoinOperation = Struct.new(:relation, :join_class, :on) - MULTI_VALUE_METHODS = [:includes, :eager_load, :preload, :select, :group, :order, :joins, :where, :having, :bind, :references, :extending, :unscope] SINGLE_VALUE_METHODS = [:limit, :offset, :lock, :readonly, :from, :reordering, :reverse_order, :distinct, :create_with, :uniq] + INVALID_METHODS_FOR_DELETE_ALL = [:limit, :distinct, :offset, :group, :having] VALUE_METHODS = MULTI_VALUE_METHODS + SINGLE_VALUE_METHODS include FinderMethods, Calculations, SpawnMethods, QueryMethods, Batches, Explain, Delegation - attr_reader :table, :klass, :loaded + attr_reader :table, :klass, :loaded, :predicate_builder alias :model :klass alias :loaded? :loaded - def initialize(klass, table, values = {}) + def initialize(klass, table, predicate_builder, values = {}) @klass = klass @table = table @values = values + @offsets = {} @loaded = false + @predicate_builder = predicate_builder end def initialize_copy(other) @@ -69,24 +71,35 @@ module ActiveRecord binds) end - def update_record(values, id, id_was) # :nodoc: + def _update_record(values, id, id_was) # :nodoc: substitutes, binds = substitute_values values - um = @klass.unscoped.where(@klass.arel_table[@klass.primary_key].eq(id_was || id)).arel.compile_update(substitutes, @klass.primary_key) + + scope = @klass.unscoped + + if @klass.finder_needs_type_condition? + scope.unscope!(where: @klass.inheritance_column) + end + + relation = scope.where(@klass.primary_key => (id_was || id)) + bvs = binds + relation.bind_values + um = relation + .arel + .compile_update(substitutes, @klass.primary_key) @klass.connection.update( um, 'SQL', - binds) + bvs, + ) end def substitute_values(values) # :nodoc: - substitutes = values.sort_by { |arel_attr,_| arel_attr.name } - binds = substitutes.map do |arel_attr, value| + binds = values.map do |arel_attr, value| [@klass.columns_hash[arel_attr.name], value] end - substitutes.each_with_index do |tuple, i| - tuple[1] = @klass.connection.substitute_at(binds[i][0], i) + substitutes = values.each_with_index.map do |(arel_attr, _), i| + [arel_attr, @klass.connection.substitute_at(binds[i][0])] end [substitutes, binds] @@ -222,6 +235,7 @@ module ActiveRecord # Please see further details in the # {Active Record Query Interface guide}[http://guides.rubyonrails.org/active_record_querying.html#running-explain]. def explain + #TODO: Fix for binds. exec_explain(collecting_queries_for_explain { exec_queries }) end @@ -231,13 +245,18 @@ module ActiveRecord @records end + # Serializes the relation objects Array. + def encode_with(coder) + coder.represent_seq(nil, to_a) + end + def as_json(options = nil) #:nodoc: to_a.as_json(options) end # Returns size of the records. def size - loaded? ? @records.length : count + loaded? ? @records.length : count(:all) end # Returns true if there are no records. @@ -247,8 +266,7 @@ module ActiveRecord if limit_value == 0 true else - # FIXME: This count is not compatible with #select('authors.*') or other select narrows - c = count + c = count(:all) c.respond_to?(:zero?) ? c.zero? : c.empty? end end @@ -287,10 +305,11 @@ module ActiveRecord klass.current_scope = previous end - # Updates all records with details given if they match a set of conditions supplied, limits and order can - # also be supplied. This method constructs a single SQL UPDATE statement and sends it straight to the - # database. It does not instantiate the involved models and it does not trigger Active Record callbacks - # or validations. + # Updates all records in the current relation with details given. This method constructs a single SQL UPDATE + # statement and sends it straight to the database. It does not instantiate the involved models and it does not + # trigger Active Record callbacks or validations. Values passed to `update_all` will not go through + # ActiveRecord's type-casting behavior. It should receive only values that can be passed as-is to the SQL + # database. # # ==== Parameters # @@ -309,7 +328,7 @@ module ActiveRecord def update_all(updates) raise ArgumentError, "Empty list of attributes to change" if updates.blank? - stmt = Arel::UpdateManager.new(arel.engine) + stmt = Arel::UpdateManager.new stmt.set Arel.sql(@klass.send(:sanitize_sql_for_assignment, updates)) stmt.table(table) @@ -323,7 +342,8 @@ module ActiveRecord stmt.wheres = arel.constraints end - @klass.connection.update stmt, 'SQL', bind_values + bvs = arel.bind_values + bind_values + @klass.connection.update stmt, 'SQL', bvs end # Updates an object (or multiple objects) and saves it to the database, if validations pass. @@ -342,9 +362,21 @@ module ActiveRecord # # Updates multiple records # people = { 1 => { "first_name" => "David" }, 2 => { "first_name" => "Jeremy" } } # Person.update(people.keys, people.values) - def update(id, attributes) + # + # # Updates multiple records from the result of a relation + # people = Person.where(group: 'expert') + # people.update(group: 'masters') + # + # Note: Updating a large number of records will run a + # UPDATE query for each record, which may cause a performance + # issue. So if it is not needed to run callbacks for each update, it is + # preferred to use <tt>update_all</tt> for updating all records using + # a single query. + def update(id = :all, attributes) if id.is_a?(Array) id.map.with_index { |one_id, idx| update(one_id, attributes[idx]) } + elsif id == :all + to_a.each { |record| record.update(attributes) } else object = find(id) object.update(attributes) @@ -381,7 +413,7 @@ module ActiveRecord if conditions where(conditions).destroy_all else - to_a.each {|object| object.destroy }.tap { reset } + to_a.each(&:destroy).tap { reset } end end @@ -427,17 +459,26 @@ module ActiveRecord # If you need to destroy dependent associations or call your <tt>before_*</tt> or # +after_destroy+ callbacks, use the +destroy_all+ method instead. # - # If a limit scope is supplied, +delete_all+ raises an ActiveRecord error: + # If an invalid method is supplied, +delete_all+ raises an ActiveRecord error: # # Post.limit(100).delete_all - # # => ActiveRecord::ActiveRecordError: delete_all doesn't support limit scope + # # => ActiveRecord::ActiveRecordError: delete_all doesn't support limit def delete_all(conditions = nil) - raise ActiveRecordError.new("delete_all doesn't support limit scope") if self.limit_value + invalid_methods = INVALID_METHODS_FOR_DELETE_ALL.select { |method| + if MULTI_VALUE_METHODS.include?(method) + send("#{method}_values").any? + else + send("#{method}_value") + end + } + if invalid_methods.any? + raise ActiveRecordError.new("delete_all doesn't support #{invalid_methods.join(', ')}") + end if conditions where(conditions).delete_all else - stmt = Arel::DeleteManager.new(arel.engine) + stmt = Arel::DeleteManager.new stmt.from(table) if joins_values.any? @@ -495,9 +536,10 @@ module ActiveRecord end def reset - @first = @last = @to_sql = @order_clause = @scope_for_create = @arel = @loaded = nil + @last = @to_sql = @order_clause = @scope_for_create = @arel = @loaded = nil @should_eager_load = @join_dependency = nil @records = [] + @offsets = {} self end @@ -515,11 +557,12 @@ module ActiveRecord find_with_associations { |rel| relation = rel } end - ast = relation.arel.ast - binds = relation.bind_values.dup - visitor.accept(ast) do - connection.quote(*binds.shift.reverse) - end + arel = relation.arel + binds = arel.bind_values + relation.bind_values + binds = connection.prepare_binds_for_database(binds) + binds.map! { |_, value| connection.quote(value) } + collect = visitor.accept(arel.ast, Arel::Collectors::Bind.new) + collect.substitute_binds(binds).join end end @@ -527,17 +570,22 @@ module ActiveRecord # # User.where(name: 'Oscar').where_values_hash # # => {name: "Oscar"} - def where_values_hash + def where_values_hash(relation_table_name = table_name) equalities = where_values.grep(Arel::Nodes::Equality).find_all { |node| - node.left.relation.name == table_name + node.left.relation.name == relation_table_name } binds = Hash[bind_values.find_all(&:first).map { |column, v| [column.name, v] }] - binds.merge!(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 }] + [name, binds.fetch(name.to_s) { + case where.right + when Array then where.right.map(&:val) + when Arel::Nodes::Casted, Arel::Nodes::Quoted + where.right.val + end + }] }] end @@ -569,6 +617,8 @@ module ActiveRecord # Compares two relations for equality. def ==(other) case other + when Associations::CollectionProxy, AssociationRelation + self == other.to_a when Relation other.to_sql == to_sql when Array @@ -599,24 +649,30 @@ module ActiveRecord private def exec_queries - @records = eager_loading? ? find_with_associations : @klass.find_by_sql(arel, bind_values) + @records = eager_loading? ? find_with_associations : @klass.find_by_sql(arel, arel.bind_values + bind_values) preload = preload_values preload += includes_values unless eager_loading? - preloader = ActiveRecord::Associations::Preloader.new + preloader = build_preloader preload.each do |associations| preloader.preload @records, associations end - @records.each { |record| record.readonly! } if readonly_value + @records.each(&:readonly!) if readonly_value @loaded = true @records end + def build_preloader + ActiveRecord::Associations::Preloader.new + end + def references_eager_loaded_tables? joined_tables = arel.join_sources.map do |join| - unless join.is_a?(Arel::Nodes::StringJoin) + if join.is_a?(Arel::Nodes::StringJoin) + tables_in_string(join.left) + else [join.left.table_name, join.left.table_alias] end end @@ -624,9 +680,16 @@ module ActiveRecord joined_tables += [table.name, table.table_alias] # always convert table names to downcase as in Oracle quoted table names are in uppercase - joined_tables = joined_tables.flatten.compact.map { |t| t.downcase }.uniq + joined_tables = joined_tables.flatten.compact.map(&:downcase).uniq (references_values - joined_tables).any? end + + def tables_in_string(string) + return [] if string.blank? + # always convert table names to downcase as in Oracle quoted table names are in uppercase + # ignore raw_sql_ that is used by Oracle adapter as alias for limit/offset subqueries + string.scan(/([a-zA-Z_][.\w]+).?\./).flatten.map(&:downcase).uniq - ['raw_sql_'] + end end end |