Class: Perpetuity::MongoDB::QueryExpression

Inherits:
Object
  • Object
show all
Defined in:
lib/perpetuity/mongodb/query_expression.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(attribute, comparator, value) ⇒ QueryExpression

Returns a new instance of QueryExpression.



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 9

def initialize attribute, comparator, value
  @attribute = attribute
  @comparator = comparator
  @value = value
  @negated = false

  @attribute = @attribute.to_sym if @attribute.respond_to? :to_sym
end

Instance Attribute Details

#attribute ⇒ Object

Returns the value of attribute attribute.



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 7

def attribute
  @attribute
end

#comparator ⇒ Object

Returns the value of attribute comparator.



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 7

def comparator
  @comparator
end

#negated ⇒ Object

Returns the value of attribute negated.



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 7

def negated
  @negated
end

#value ⇒ Object

Returns the value of attribute value.



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 7

def value
  @value
end

Instance Method Details

#&(other) ⇒ Object 



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 76

def & other
  QueryIntersection.new(self, other)
end

#==(other) ⇒ Object 



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 86

def == other
  attribute == other.attribute &&
  comparator == other.comparator &&
  value == other.value &&
  negated == other.negated
end

#equals ⇒ Object 



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 22

def equals
  if @negated
    { @attribute => { '$ne' => @value } }
  else
    { @attribute => @value }
  end
end

#function(func) ⇒ Object 



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 30

def function func
  f = { func => @value }

  if @negated
    { @attribute => { '$not' => f } }
  else
    { @attribute => f }
  end
end

#greater_than ⇒ Object 



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 48

def greater_than
  function '$gt'
end

#gte ⇒ Object 



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 52

def gte
  function '$gte'
end

#in ⇒ Object 



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 60

def in
  function '$in'
end

#less_than ⇒ Object 



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 40

def less_than
  function '$lt'
end

#lte ⇒ Object 



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 44

def lte
  function '$lte'
end

#matches ⇒ Object 



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 64

def matches
  if @negated
    { @attribute => { '$not' => @value } }
  else
    { @attribute => @value }
  end
end

#negate ⇒ Object 



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 80

def negate
  expr = dup
  expr.negated = true
  expr
end

#not_equal ⇒ Object 



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 56

def not_equal
  function '$ne'
end

#to_db ⇒ Object 



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 18

def to_db
  public_send @comparator
end

#|(other) ⇒ Object 



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# File 'lib/perpetuity/mongodb/query_expression.rb', line 72

def | other
  QueryUnion.new(self, other)
end