Class: Arel::Table

Inherits:
Object
  • Object
show all
Includes:
Crud, FactoryMethods
Defined in:
lib/arel/table.rb

Class Attribute Summary collapse

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from FactoryMethods

#create_and, #create_false, #create_join, #create_on, #create_string_join, #create_table_alias, #create_true, #grouping, #lower

Methods included from Crud

#compile_delete, #compile_insert, #compile_update, #create_insert

Constructor Details

#initialize(name, engine = Table.engine) ⇒ Table



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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

Class Attribute Details

.engineObject

Returns the value of attribute engine



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# File 'lib/arel/table.rb', line 7

def engine
  @engine
end

Instance Attribute Details

#aliasesObject

Returns the value of attribute aliases



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# File 'lib/arel/table.rb', line 9

def aliases
  @aliases
end

#engineObject

Returns the value of attribute engine



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# File 'lib/arel/table.rb', line 9

def engine
  @engine
end

#nameObject Also known as: table_name

Returns the value of attribute name



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# File 'lib/arel/table.rb', line 9

def name
  @name
end

#table_aliasObject

Returns the value of attribute table_alias



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# File 'lib/arel/table.rb', line 9

def table_alias
  @table_alias
end

Instance Method Details

#[](name) ⇒ Object



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# File 'lib/arel/table.rb', line 95

def [] name
  ::Arel::Attribute.new self, name
end

#alias(name = "#{self.name}_2") ⇒ Object



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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) ⇒ Boolean Also known as: ==



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# File 'lib/arel/table.rb', line 114

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

#from(table) ⇒ Object



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# File 'lib/arel/table.rb', line 51

def from table
  SelectManager.new(@engine, table)
end

#group(*columns) ⇒ Object



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# File 'lib/arel/table.rb', line 67

def group *columns
  from(self).group(*columns)
end

#hashObject



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# File 'lib/arel/table.rb', line 107

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) ⇒ Object



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# File 'lib/arel/table.rb', line 91

def having expr
  from(self).having expr
end

#insert_managerObject



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# File 'lib/arel/table.rb', line 103

def insert_manager
  InsertManager.new(@engine)
end

#join(relation, klass = Nodes::InnerJoin) ⇒ Object



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# File 'lib/arel/table.rb', line 55

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

#order(*expr) ⇒ Object



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# File 'lib/arel/table.rb', line 71

def order *expr
  from(self).order(*expr)
end

#primary_keyObject



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# 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

#project(*things) ⇒ Object



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# File 'lib/arel/table.rb', line 79

def project *things
  from(self).project(*things)
end

#select_managerObject



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# File 'lib/arel/table.rb', line 99

def select_manager
  SelectManager.new(@engine)
end

#skip(amount) ⇒ Object



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# File 'lib/arel/table.rb', line 87

def skip amount
  from(self).skip amount
end

#take(amount) ⇒ Object



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# File 'lib/arel/table.rb', line 83

def take amount
  from(self).take amount
end

#where(condition) ⇒ Object



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# File 'lib/arel/table.rb', line 75

def where condition
  from(self).where condition
end