# File lib/arel/table.rb, line 32 def primary_key if $VERBOSE warn <<-eowarn primary_key (#{caller.first}) is deprecated and will be removed in Arel 4.0.0 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
class Arel::Table
Attributes
engine[RW]
aliases[RW]
engine[RW]
name[RW]
table_alias[RW]
table_name[RW]
Public Class Methods
new(name, engine = Table.engine)
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# File lib/arel/table.rb, line 14 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
Public Instance Methods
[](name)
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# File lib/arel/table.rb, line 103 def [] name ::Arel::Attribute.new self, name end
alias(name = "
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# File lib/arel/table.rb, line 45 def alias name = "#{self.name}_2" Nodes::TableAlias.new(self, name).tap do |node| @aliases << node end end
eql?(other)
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# File lib/arel/table.rb, line 122 def eql? other self.class == other.class && self.name == other.name && self.engine == other.engine && self.aliases == other.aliases && self.table_alias == other.table_alias end
Also aliased as: ==
from(table)
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# File lib/arel/table.rb, line 51 def from table SelectManager.new(@engine, table) end
group(*columns)
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# File lib/arel/table.rb, line 75 def group *columns from(self).group(*columns) end
hash()
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# File lib/arel/table.rb, line 115 def hash # Perf note: aliases, table alias and engine is excluded from the hash # aliases can have a loop back to this table breaking hashes in parent # relations, for the vast majority of cases @name is unique to a query @name.hash end
having(expr)
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# File lib/arel/table.rb, line 99 def having expr from(self).having expr end
insert_manager()
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# File lib/arel/table.rb, line 111 def insert_manager InsertManager.new(@engine) end
join(relation, klass = Nodes::InnerJoin)
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# File lib/arel/table.rb, line 63 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(self).join(relation, klass) end
joins(manager)
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# File lib/arel/table.rb, line 55 def joins manager if $VERBOSE warn "joins is deprecated and will be removed in 4.0.0" warn "please remove your call to joins from #{caller.first}" end nil end
order(*expr)
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# File lib/arel/table.rb, line 79 def order *expr from(self).order(*expr) end
primary_key()
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project(*things)
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# File lib/arel/table.rb, line 87 def project *things from(self).project(*things) end
select_manager()
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# File lib/arel/table.rb, line 107 def select_manager SelectManager.new(@engine) end
skip(amount)
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# File lib/arel/table.rb, line 95 def skip amount from(self).skip amount end
take(amount)
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# File lib/arel/table.rb, line 91 def take amount from(self).take amount end
where(condition)
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# File lib/arel/table.rb, line 83 def where condition from(self).where condition end
Private Instance Methods
attributes_for(columns)
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# File lib/arel/table.rb, line 133 def attributes_for columns return nil unless columns columns.map do |column| Attributes.for(column).new self, column.name.to_sym end end