Class: Payload::Attr

Inherits:
Object
  • Object
show all
Defined in:
lib/payload/arm/attr.rb

Overview

Attribute DSL for select/group_by/order_by and filter expressions.

  • pl.attr.id -> “id”

  • pl.attr.created_at(:month) -> “month(created_at)”

  • pl.attr.amount(:sum) -> “sum(amount)”

  • pl.attr.sender.account_id -> “sender”

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(param, parent = nil) ⇒ Attr

Returns a new instance of Attr.



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# File 'lib/payload/arm/attr.rb', line 102

def initialize(param, parent = nil)
  @param = param.to_s
  @parent = parent
  @is_method = false
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args) ⇒ Object 



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# File 'lib/payload/arm/attr.rb', line 120

def method_missing(name, *args)
  raise "cannot get attr of method" if @is_method

  if args.size == 1 && args[0].is_a?(Symbol)
    inner = Attr.new(name.to_s, self)
    Attr.new(args[0].to_s, inner).call
  else
    Attr.new(name.to_s, self)
  end
end

Instance Attribute Details

#param ⇒ Object (readonly)

Returns the value of attribute param.



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# File 'lib/payload/arm/attr.rb', line 90

def param
  @param
end

#parent ⇒ Object (readonly)

Returns the value of attribute parent.



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# File 'lib/payload/arm/attr.rb', line 90

def parent
  @parent
end

Class Method Details

.method_missing(name, *args) ⇒ Object 



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# File 'lib/payload/arm/attr.rb', line 93

def method_missing(name, *args)
  new(name.to_s)
end

.respond_to_missing?(name, include_private = false) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/payload/arm/attr.rb', line 97

def respond_to_missing?(name, include_private = false)
  true
end

Instance Method Details

#!=(other) ⇒ Object 



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# File 'lib/payload/arm/attr.rb', line 145

def !=(other)
  ARMNotEqual.new(self, other)
end

#<(other) ⇒ Object 



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# File 'lib/payload/arm/attr.rb', line 153

def <(other)
  ARMLessThan.new(self, other)
end

#<=(other) ⇒ Object 



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# File 'lib/payload/arm/attr.rb', line 161

def <=(other)
  ARMLessThanEqual.new(self, other)
end

#==(other) ⇒ Object 



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# File 'lib/payload/arm/attr.rb', line 141

def ==(other)
  ARMEqual.new(self, other)
end

#>(other) ⇒ Object 



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# File 'lib/payload/arm/attr.rb', line 149

def >(other)
  ARMGreaterThan.new(self, other)
end

#>=(other) ⇒ Object 



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# File 'lib/payload/arm/attr.rb', line 157

def >=(other)
  ARMGreaterThanEqual.new(self, other)
end

#call ⇒ Object

Mark attribute as a function call (e.g. .month(), .sum())



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# File 'lib/payload/arm/attr.rb', line 136

def call
  @is_method = true
  self
end

#contains(other) ⇒ Object 



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# File 'lib/payload/arm/attr.rb', line 165

def contains(other)
  ARMContains.new(self, other)
end

#key ⇒ Object 



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# File 'lib/payload/arm/attr.rb', line 108

def key
  @parent ? "#{@parent.key}[#{@param}]" : @param
end

#respond_to_missing?(name, include_private = false) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/payload/arm/attr.rb', line 131

def respond_to_missing?(name, include_private = false)
  true
end

#strip ⇒ Object 



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# File 'lib/payload/arm/attr.rb', line 116

def strip
  to_s.strip
end

#to_s ⇒ Object 



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# File 'lib/payload/arm/attr.rb', line 112

def to_s
  @is_method ? "#{@param}(#{@parent.key})" : key
end