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# frozen_string_literal: true
require "active_record/associations/join_dependency/join_part"
require "active_support/core_ext/array/extract"
module ActiveRecord
module Associations
class JoinDependency # :nodoc:
class JoinAssociation < JoinPart # :nodoc:
attr_reader :reflection, :tables
attr_accessor :table
def initialize(reflection, children)
super(reflection.klass, children)
@reflection = reflection
@tables = nil
end
def match?(other)
return true if self == other
super && reflection == other.reflection
end
def join_constraints(foreign_table, foreign_klass, join_type, alias_tracker)
joins = []
# The chain starts with the target table, but we want to end with it here (makes
# more sense in this context), so we reverse
reflection.chain.reverse_each.with_index(1) do |reflection, i|
table = tables[-i]
klass = reflection.klass
join_scope = reflection.join_scope(table, foreign_table, foreign_klass)
arel = join_scope.arel(alias_tracker.aliases)
nodes = arel.constraints.first
others = nodes.children.extract! do |node|
Arel.fetch_attribute(node) { |attr| attr.relation.name != table.name }
end
joins << table.create_join(table, table.create_on(nodes), join_type)
unless others.empty?
joins.concat arel.join_sources
append_constraints(joins.last, others)
end
# The current table in this iteration becomes the foreign table in the next
foreign_table, foreign_klass = table, klass
end
joins
end
def tables=(tables)
@tables = tables
@table = tables.first
end
def readonly?
return @readonly if defined?(@readonly)
@readonly = reflection.scope && reflection.scope_for(base_klass.unscoped).readonly_value
end
private
def append_constraints(join, constraints)
if join.is_a?(Arel::Nodes::StringJoin)
join_string = table.create_and(constraints.unshift(join.left))
join.left = Arel.sql(base_klass.connection.visitor.compile(join_string))
else
join.right.expr.children.concat(constraints)
end
end
end
end
end
end
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