diff options
Diffstat (limited to 'activerecord/lib/active_record/associations/alias_tracker.rb')
-rw-r--r-- | activerecord/lib/active_record/associations/alias_tracker.rb | 55 |
1 files changed, 23 insertions, 32 deletions
diff --git a/activerecord/lib/active_record/associations/alias_tracker.rb b/activerecord/lib/active_record/associations/alias_tracker.rb index 3963008a76..272eede824 100644 --- a/activerecord/lib/active_record/associations/alias_tracker.rb +++ b/activerecord/lib/active_record/associations/alias_tracker.rb @@ -1,51 +1,41 @@ +# frozen_string_literal: true + require "active_support/core_ext/string/conversions" module ActiveRecord module Associations # Keeps track of table aliases for ActiveRecord::Associations::JoinDependency class AliasTracker # :nodoc: - attr_reader :aliases - - def self.create(connection, initial_table, type_caster) - aliases = Hash.new(0) - aliases[initial_table] = 1 - new connection, aliases, type_caster - end - - def self.create_with_joins(connection, initial_table, joins, type_caster) + def self.create(connection, initial_table, joins) if joins.empty? - create(connection, initial_table, type_caster) + aliases = Hash.new(0) else aliases = Hash.new { |h, k| h[k] = initial_count_for(connection, k, joins) } - aliases[initial_table] = 1 - new connection, aliases, type_caster end + aliases[initial_table] = 1 + new(connection, aliases) end def self.initial_count_for(connection, name, table_joins) - # quoted_name should be downcased as some database adapters (Oracle) return quoted name in uppercase - quoted_name = connection.quote_table_name(name).downcase + quoted_name = nil counts = table_joins.map do |join| if join.is_a?(Arel::Nodes::StringJoin) + # quoted_name should be case ignored as some database adapters (Oracle) return quoted name in uppercase + quoted_name ||= connection.quote_table_name(name) + # Table names + table aliases - join.left.downcase.scan( - /join(?:\s+\w+)?\s+(\S+\s+)?#{quoted_name}\son/ + join.left.scan( + /JOIN(?:\s+\w+)?\s+(?:\S+\s+)?(?:#{quoted_name}|#{name})\sON/i ).size - elsif join.respond_to? :left - join.left.table_name == name ? 1 : 0 + elsif join.is_a?(Arel::Nodes::Join) + join.left.name == name ? 1 : 0 + elsif join.is_a?(Hash) + join[name] else - # this branch is reached by two tests: - # - # activerecord/test/cases/associations/cascaded_eager_loading_test.rb:37 - # with :posts - # - # activerecord/test/cases/associations/eager_test.rb:1133 - # with :comments - # - 0 + raise ArgumentError, "joins list should be initialized by list of Arel::Nodes::Join" end end @@ -53,17 +43,16 @@ module ActiveRecord end # table_joins is an array of arel joins which might conflict with the aliases we assign here - def initialize(connection, aliases, type_caster) + def initialize(connection, aliases) @aliases = aliases @connection = connection - @type_caster = type_caster end - def aliased_table_for(table_name, aliased_name) + def aliased_table_for(table_name, aliased_name, type_caster) if aliases[table_name].zero? # If it's zero, we can have our table_name aliases[table_name] = 1 - Arel::Table.new(table_name, type_caster: @type_caster) + Arel::Table.new(table_name, type_caster: type_caster) else # Otherwise, we need to use an alias aliased_name = @connection.table_alias_for(aliased_name) @@ -76,10 +65,12 @@ module ActiveRecord else aliased_name end - Arel::Table.new(table_name, type_caster: @type_caster).alias(table_alias) + Arel::Table.new(table_name, type_caster: type_caster).alias(table_alias) end end + attr_reader :aliases + private def truncate(name) |