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|
module Arel
class Table
include Arel::Crud
include Arel::FactoryMethods
@engine = nil
class << self; attr_accessor :engine; end
attr_accessor :name, :engine, :aliases, :table_alias
def initialize name, engine = Table.engine
@name = name.to_s
@engine = engine
@columns = nil
@aliases = []
@table_alias = nil
@primary_key = nil
if Hash === engine
@engine = engine[:engine] || Table.engine
# Sometime AR sends an :as parameter to table, to let the table know
# that it is an Alias. We may want to override new, and return a
# TableAlias node?
@table_alias = engine[:as] unless engine[:as].to_s == @name
end
end
def primary_key
if $VERBOSE
warn <<-eowarn
primary_key (#{caller.first}) is deprecated and will be removed in ARel 3.0.0. Please
switch to `compile_insert`
eowarn
end
@primary_key ||= begin
primary_key_name = @engine.connection.primary_key(name)
# some tables might be without primary key
primary_key_name && self[primary_key_name]
end
end
def alias name = "#{self.name}_2"
Nodes::TableAlias.new(name, self).tap do |node|
@aliases << node
end
end
def from table
SelectManager.new(@engine, table)
end
def joins manager
if $VERBOSE
warn "joins is deprecated and will be removed in 3.0.0"
warn "please remove your call to joins from #{caller.first}"
end
nil
end
def join relation, klass = Nodes::InnerJoin
return from(self) unless relation
case relation
when String, Nodes::SqlLiteral
raise if relation.blank?
klass = Nodes::StringJoin
end
from create_join(self, relation, nil, klass)
end
def group *columns
from(self).group(*columns)
end
def order *expr
from(self).order(*expr)
end
def where condition
from(self).where condition
end
def project *things
from(self).project(*things)
end
def take amount
from(self).take amount
end
def skip amount
from(self).skip amount
end
def having expr
from(self).having expr
end
def columns
if $VERBOSE
warn <<-eowarn
(#{caller.first}) Arel::Table#columns is deprecated and will be removed in
Arel 3.0.0 with no replacement. PEW PEW PEW!!!
eowarn
end
@columns ||=
attributes_for @engine.connection.columns(@name, "#{@name} Columns")
end
def [] name
::Arel::Attribute.new self, name.to_sym
end
def select_manager
SelectManager.new(@engine)
end
def insert_manager
InsertManager.new(@engine)
end
private
def attributes_for columns
return nil unless columns
columns.map do |column|
Attributes.for(column).new self, column.name.to_sym
end
end
@@table_cache = nil
def self.table_cache engine # :nodoc:
if $VERBOSE
warn <<-eowarn
(#{caller.first}) Arel::Table.table_cache is deprecated and will be removed in
Arel 3.0.0 with no replacement. PEW PEW PEW!!!
eowarn
end
@@table_cache ||= Hash[engine.connection.tables.map { |x| [x,true] }]
end
end
end
|
