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require 'active_record'
require 'active_support/ordered_hash'
class Joiner::Joins
attr_reader :model
def initialize(model)
@model = model
@joins_cache = Set.new
end
def add_join_to(path)
return if path.empty?
joins_cache.add path_as_hash(path)
end
def alias_for(path)
return model.table_name if path.empty?
add_join_to path
association_for(path).table.name
end
def join_values
Joiner::JoinDependency.new(
model, table, joins_cache.to_a, Arel::Nodes::OuterJoin
)
end
private
attr_reader :joins_cache
def alias_tracker
Joiner::AliasTracker.create(
model.connection, table.name, []
)
end
def association_for(path)
join_values.join_association_for path, alias_tracker
end
def path_as_hash(path)
path[0..-2].reverse.inject(path.last) { |key, item| {item => key} }
end
def table
@table ||= model.arel_table
end
end
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