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require 'active_support/core_ext/string/conversions'
module ActiveRecord
module Associations
# Keeps track of table aliases for ActiveRecord::Associations::ClassMethods::JoinDependency and
# ActiveRecord::Associations::ThroughAssociationScope
class AliasTracker # :nodoc:
attr_reader :aliases, :table_joins
# table_joins is an array of arel joins which might conflict with the aliases we assign here
def initialize(table_joins = [])
@aliases = Hash.new
@table_joins = table_joins
end
def aliased_table_for(table_name, aliased_name = nil)
table_alias = aliased_name_for(table_name, aliased_name)
if table_alias == table_name
Arel::Table.new(table_name)
else
Arel::Table.new(table_name).alias(table_alias)
end
end
def aliased_name_for(table_name, aliased_name = nil)
aliased_name ||= table_name
initialize_count_for(table_name) if aliases[table_name].nil?
if aliases[table_name].zero?
# If it's zero, we can have our table_name
aliases[table_name] = 1
table_name
else
# Otherwise, we need to use an alias
aliased_name = connection.table_alias_for(aliased_name)
initialize_count_for(aliased_name) if aliases[aliased_name].nil?
# Update the count
aliases[aliased_name] += 1
if aliases[aliased_name] > 1
"#{truncate(aliased_name)}_#{aliases[aliased_name]}"
else
aliased_name
end
end
end
def pluralize(table_name)
ActiveRecord::Base.pluralize_table_names ? table_name.to_s.pluralize : table_name
end
private
def initialize_count_for(name)
aliases[name] = 0
unless Arel::Table === 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
aliases[name] += table_joins.map { |join|
# Table names + table aliases
join.left.downcase.scan(
/join(?:\s+\w+)?\s+(\S+\s+)?#{quoted_name}\son/
).size
}.sum
end
aliases[name]
end
def truncate(name)
name[0..connection.table_alias_length-3]
end
def connection
ActiveRecord::Base.connection
end
end
end
end
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