Class: Ransack::Nodes::Condition

Inherits:
Node
  • Object
show all
Defined in:
lib/ransack/nodes/condition.rb

Instance Attribute Summary collapse

Attributes inherited from Node

#context

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Node

i18n_alias, i18n_word, #initialize, #translate

Constructor Details

This class inherits a constructor from Ransack::Nodes::Node

Instance Attribute Details

#predicate ⇒ Object

Returns the value of attribute predicate.



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# File 'lib/ransack/nodes/condition.rb', line 7

def predicate
  @predicate
end

Class Method Details

.extract(context, key, values) ⇒ Object 



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# File 'lib/ransack/nodes/condition.rb', line 10

def extract(context, key, values)
  attributes, predicate = extract_attributes_and_predicate(key)
  if attributes.size > 0
    combinator = key.match(/_(or|and)_/) ? $1 : nil
    condition = self.new(context)
    condition.build(
      :a => attributes,
      :p => predicate.name,
      :m => combinator,
      :v => predicate.wants_array ? Array(values) : [values]
    )
    # TODO: Figure out what to do with multiple types of attributes, if anything.
    # Tempted to go with "garbage in, garbage out" on this one
    predicate.validate(condition.values, condition.default_type) ? condition : nil
  end
end

Instance Method Details

#arel_predicate ⇒ Object 



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# File 'lib/ransack/nodes/condition.rb', line 165

def arel_predicate
  predicates = attributes.map do |attr|
    attr.attr.send(predicate.arel_predicate, formatted_values_for_attribute(attr))
  end

  if predicates.size > 1
    case combinator
    when 'and'
      Arel::Nodes::Grouping.new(Arel::Nodes::And.new(predicates))
    when 'or'
      predicates.inject(&:or)
    end
  else
    predicates.first
  end
end

#attributes ⇒ Object Also known as: a 



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# File 'lib/ransack/nodes/condition.rb', line 47

def attributes
  @attributes ||= []
end

#attributes=(args) ⇒ Object Also known as: a= 



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# File 'lib/ransack/nodes/condition.rb', line 52

def attributes=(args)
  case args
  when Array
    args.each do |attr|
      attr = Attribute.new(@context, attr)
      self.attributes << attr if attr.valid?
    end
  when Hash
    args.each do |index, attrs|
      attr = Attribute.new(@context, attrs[:name])
      self.attributes << attr if attr.valid?
    end
  else
    raise ArgumentError, "Invalid argument (#{args.class}) supplied to attributes="
  end
end

#build(params) ⇒ Object 



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# File 'lib/ransack/nodes/condition.rb', line 119

def build(params)
  params.with_indifferent_access.each do |key, value|
    if key.match(/^(a|v|p|m)$/)
      self.send("#{key}=", value)
    end
  end

  self
end

#build_attribute(name = nil) ⇒ Object 



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# File 'lib/ransack/nodes/condition.rb', line 103

def build_attribute(name = nil)
  Attribute.new(@context, name).tap do |attribute|
    self.attributes << attribute
  end
end

#build_value(val = nil) ⇒ Object 



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# File 'lib/ransack/nodes/condition.rb', line 109

def build_value(val = nil)
  Value.new(@context, val).tap do |value|
    self.values << value
  end
end

#casted_values_for_attribute(attr) ⇒ Object 



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# File 'lib/ransack/nodes/condition.rb', line 186

def casted_values_for_attribute(attr)
  validated_values.map {|v| v.cast(predicate.type || attr.type)}
end

#combinator ⇒ Object Also known as: m 



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# File 'lib/ransack/nodes/condition.rb', line 93

def combinator
  @attributes.size > 1 ? @combinator : nil
end

#combinator=(val) ⇒ Object Also known as: m= 



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# File 'lib/ransack/nodes/condition.rb', line 97

def combinator=(val)
  @combinator = ['and', 'or'].detect {|v| v == val.to_s} || nil
end

#default_type ⇒ Object 



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# File 'lib/ransack/nodes/condition.rb', line 199

def default_type
  predicate.type || (attributes.first && attributes.first.type)
end

#eql?(other) ⇒ Boolean Also known as: ==

Returns:

  • (Boolean) 


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# File 'lib/ransack/nodes/condition.rb', line 137

def eql?(other)
  self.class == other.class &&
  self.attributes == other.attributes &&
  self.predicate == other.predicate &&
  self.values == other.values &&
  self.combinator == other.combinator
end

#formatted_values_for_attribute(attr) ⇒ Object 



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# File 'lib/ransack/nodes/condition.rb', line 190

def formatted_values_for_attribute(attr)
  formatted = casted_values_for_attribute(attr).map do |val|
    val = attr.ransacker.formatter.call(val) if attr.ransacker && attr.ransacker.formatter
    val = predicate.format(val)
    val
  end
  predicate.wants_array ? formatted : formatted.first
end

#hash ⇒ Object 



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# File 'lib/ransack/nodes/condition.rb', line 146

def hash
  [attributes, predicate, values, combinator].hash
end

#key ⇒ Object 



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# File 'lib/ransack/nodes/condition.rb', line 133

def key
  @key ||= attributes.map(&:name).join("_#{combinator}_") + "_#{predicate.name}"
end

#persisted? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ransack/nodes/condition.rb', line 129

def persisted?
  false
end

#predicate_name ⇒ Object Also known as: p 



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# File 'lib/ransack/nodes/condition.rb', line 160

def predicate_name
  predicate.name if predicate
end

#predicate_name=(name) ⇒ Object Also known as: p= 



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# File 'lib/ransack/nodes/condition.rb', line 150

def predicate_name=(name)
  self.predicate = Predicate.named(name)
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ransack/nodes/condition.rb', line 39

def valid?
  attributes.detect(&:valid?) && predicate && valid_arity? && predicate.validate(values, default_type) && valid_combinator?
end

#valid_arity? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ransack/nodes/condition.rb', line 43

def valid_arity?
  values.size <= 1 || predicate.wants_array
end

#validated_values ⇒ Object 



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# File 'lib/ransack/nodes/condition.rb', line 182

def validated_values
  values.select {|v| predicate.validator.call(v.value)}
end

#value ⇒ Object 



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# File 'lib/ransack/nodes/condition.rb', line 115

def value
  predicate.wants_array ? values.map {|v| v.cast(default_type)} : values.first.cast(default_type)
end

#values ⇒ Object Also known as: v 



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# File 'lib/ransack/nodes/condition.rb', line 70

def values
  @values ||= []
end

#values=(args) ⇒ Object Also known as: v= 



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# File 'lib/ransack/nodes/condition.rb', line 75

def values=(args)
  case args
  when Array
    args.each do |val|
      val = Value.new(@context, val)
      self.values << val
    end
  when Hash
    args.each do |index, attrs|
      val = Value.new(@context, attrs[:value])
      self.values << val
    end
  else
    raise ArgumentError, "Invalid argument (#{args.class}) supplied to values="
  end
end