diff options
Diffstat (limited to 'activerecord/lib/active_record/associations/join_dependency/join_association.rb')
| -rw-r--r-- | activerecord/lib/active_record/associations/join_dependency/join_association.rb | 81 |
1 files changed, 17 insertions, 64 deletions
diff --git a/activerecord/lib/active_record/associations/join_dependency/join_association.rb b/activerecord/lib/active_record/associations/join_dependency/join_association.rb index 97cfec0302..221c791bf8 100644 --- a/activerecord/lib/active_record/associations/join_dependency/join_association.rb +++ b/activerecord/lib/active_record/associations/join_dependency/join_association.rb @@ -1,3 +1,5 @@ +# frozen_string_literal: true + require "active_record/associations/join_dependency/join_part" module ActiveRecord @@ -9,11 +11,12 @@ module ActiveRecord attr_accessor :tables - def initialize(reflection, children) + def initialize(reflection, children, alias_tracker) super(reflection.klass, children) - @reflection = reflection - @tables = nil + @alias_tracker = alias_tracker + @reflection = reflection + @tables = nil end def match?(other) @@ -21,11 +24,8 @@ module ActiveRecord super && reflection == other.reflection end - JoinInformation = Struct.new :joins, :binds - def join_constraints(foreign_table, foreign_klass, join_type, tables, chain) joins = [] - binds = [] tables = tables.reverse # The chain starts with the target table, but we want to end with it here (makes @@ -34,79 +34,32 @@ module ActiveRecord table = tables.shift klass = reflection.klass - join_keys = reflection.join_keys - key = join_keys.key - foreign_key = join_keys.foreign_key - - constraint = build_constraint(klass, table, key, foreign_table, foreign_key) - - predicate_builder = PredicateBuilder.new(TableMetadata.new(klass, table)) - scope_chain_items = reflection.join_scopes(table, predicate_builder) - klass_scope = reflection.klass_join_scope(table, predicate_builder) + constraint = reflection.build_join_constraint(table, foreign_table) - scope_chain_items.concat [klass_scope].compact - - rel = scope_chain_items.inject(scope_chain_items.shift) do |left, right| - left.merge right - end - - if rel && !rel.arel.constraints.empty? - binds += rel.bound_attributes - constraint = constraint.and rel.arel.constraints - end + joins << table.create_join(table, table.create_on(constraint), join_type) - if reflection.type - value = foreign_klass.base_class.name - column = klass.columns_hash[reflection.type.to_s] + join_scope = reflection.join_scope(table, foreign_klass) + arel = join_scope.arel(alias_tracker.aliases) - binds << Relation::QueryAttribute.new(column.name, value, klass.type_for_attribute(column.name)) - constraint = constraint.and klass.arel_attribute(reflection.type, table).eq(Arel::Nodes::BindParam.new) + if arel.constraints.any? + joins.concat arel.join_sources + right = joins.last.right + right.expr = right.expr.and(arel.constraints) end - joins << table.create_join(table, table.create_on(constraint), join_type) - # The current table in this iteration becomes the foreign table in the next foreign_table, foreign_klass = table, klass end - JoinInformation.new joins, binds - end - - # Builds equality condition. - # - # Example: - # - # class Physician < ActiveRecord::Base - # has_many :appointments - # end - # - # If I execute `Physician.joins(:appointments).to_a` then - # klass # => Physician - # table # => #<Arel::Table @name="appointments" ...> - # key # => physician_id - # foreign_table # => #<Arel::Table @name="physicians" ...> - # foreign_key # => id - # - def build_constraint(klass, table, key, foreign_table, foreign_key) - constraint = table[key].eq(foreign_table[foreign_key]) - - if klass.finder_needs_type_condition? - constraint = table.create_and([ - constraint, - klass.send(:type_condition, table) - ]) - end - - constraint + joins end def table tables.first end - def aliased_table_name - table.table_alias || table.name - end + protected + attr_reader :alias_tracker end end end |