Class: Ransack::Visitor

Inherits:
Object
  • Object
show all
Defined in:
lib/ransack/visitor.rb,
lib/ransack/adapters/active_record/3.0/compat.rb

Constant Summary collapse

DISPATCH = 
Hash.new do |hash, klass|
  hash[klass] = "visit_#{
    klass.name.gsub('::'.freeze, Ransack::Constants::UNDERSCORE)
    }"
end

Instance Method Summary collapse

Instance Method Details

#accept(object) ⇒ Object 



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# File 'lib/ransack/visitor.rb', line 4

def accept(object)
  visit(object)
end

#can_accept?(object) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ransack/visitor.rb', line 8

def can_accept?(object)
  respond_to? DISPATCH[object.class]
end

#quoted?(object) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ransack/visitor.rb', line 54

def quoted?(object)
  case object
  when Arel::Nodes::SqlLiteral, Bignum, Fixnum
    false
  else
    true
  end
end

#visit(object) ⇒ Object 



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# File 'lib/ransack/visitor.rb', line 63

def visit(object)
  send(DISPATCH[object.class], object)
end

#visit_and(object) ⇒ Object 



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# File 'lib/ransack/visitor.rb', line 28

def visit_and(object)
  nodes = object.values.map { |o| accept(o) }.compact
  return nil unless nodes.size > 0

  if nodes.size > 1
    Arel::Nodes::Grouping.new(Arel::Nodes::And.new(nodes))
  else
    nodes.first
  end
end

#visit_Array(object) ⇒ Object 



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# File 'lib/ransack/visitor.rb', line 12

def visit_Array(object)
  object.map { |o| accept(o) }.compact
end

#visit_or(object) ⇒ Object 



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# File 'lib/ransack/visitor.rb', line 39

def visit_or(object)
  nodes = object.values.map { |o| accept(o) }.compact
  return nil unless nodes.size > 0

  if nodes.size > 1
    nodes.inject(&:or)
  else
    nodes.first
  end
end

#visit_Ransack_Nodes_And(object) ⇒ Object 



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# File 'lib/ransack/adapters/active_record/3.0/compat.rb', line 4

def visit_Ransack_Nodes_And(object)
  nodes = object.values.map { |o| accept(o) }.compact
  return nil unless nodes.size > 0

  if nodes.size > 1
    nodes.inject(&:and)
  else
    nodes.first
  end
end

#visit_Ransack_Nodes_Condition(object) ⇒ Object 



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# File 'lib/ransack/visitor.rb', line 16

def visit_Ransack_Nodes_Condition(object)
  object.arel_predicate if object.valid?
end

#visit_Ransack_Nodes_Grouping(object) ⇒ Object 



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# File 'lib/ransack/visitor.rb', line 20

def visit_Ransack_Nodes_Grouping(object)
  if object.combinator == Ransack::Constants::OR
    visit_or(object)
  else
    visit_and(object)
  end
end

#visit_Ransack_Nodes_Sort(object) ⇒ Object 



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# File 'lib/ransack/visitor.rb', line 50

def visit_Ransack_Nodes_Sort(object)
  object.attr.send(object.dir) if object.valid?
end