Class: SmqlToAR::ConditionTypes::Condition

Inherits:
Object
  • Object
show all
Extended by:
Assertion
Includes:
Assertion
Defined in:
lib/smql_to_ar/condition_types.rb

Constant Summary collapse

Operator = 
nil
Expected = 
[]
Where = 
nil

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Assertion

raise_if, raise_unless

Constructor Details

#initialize(model, cols, val) ⇒ Condition

Returns a new instance of Condition.



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# File 'lib/smql_to_ar/condition_types.rb', line 114

def initialize model, cols, val
	#p init: self, caller: caller
	@model, @cols = model, cols
	@value = case val
		when Hash, Range then val
		else Array.wrap val
		end
	verify
end

Instance Attribute Details

#cols ⇒ Object (readonly)

Returns the value of attribute cols.



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# File 'lib/smql_to_ar/condition_types.rb', line 96

def cols
  @cols
end

#value ⇒ Object (readonly)

Returns the value of attribute value.



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# File 'lib/smql_to_ar/condition_types.rb', line 96

def value
  @value
end

Class Method Details

.inspect ⇒ Object 



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# File 'lib/smql_to_ar/condition_types.rb', line 109

def inspect
	"#{self.name}( :operator=>#{self::Operator.inspect}, :expected=>#{self::Expected.inspect}, :where=>#{self::Where.inspect})"
end

.try_parse(model, cols, op, val) ⇒ Object

Versuche das Objekt zu erkennen. Operator und Expected muessen passen. Passt das Object, die Klasse instanzieren.



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# File 'lib/smql_to_ar/condition_types.rb', line 104

def try_parse model, cols, op, val
	#p :class => self, :self => name, :try_parse => op, :cols => cols, :with => self::Operator, :value => val, :expected => self::Expected, :model => model.name
	new model, cols, val  if self::Operator === op and self::Expected.any? {|x| x === val}
end

Instance Method Details

#condition_build(builder, table) ⇒ Object Also known as: build

Erstelle alle noetigen Klauseln. builder nimmt diese entgegen, wobei builder.joins, builder.select, builder.where und builder.wobs von interesse sind. mehrere Schluessel bedeuten, dass die Values alle zutreffen muessen, wobei die Schluessel geODERt werden. Ex: 1) “Peter” #=> givenname = ‘Peter’ 2) [“Peter”, “Hans”] #=> ( givenname = ‘Peter’ OR givenname = ‘Hans’ ) 3) [“Peter”, “Mueller”]

#=> ( givenname = 'Peter' OR surname = 'Peter' ) AND ( givenname = 'Mueller' OR surname = 'Mueller' )



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# File 'lib/smql_to_ar/condition_types.rb', line 156

def condition_build builder, table
	values = Hash[ @value.collect {|value| [ builder.vid, value ] } ]
	values.each {|k, v| builder.wobs k.to_sym => v }
	if 1 == @cols.length
		@cols.each do |col|
			col.joins builder, table
			col = builder.column table+col.path, col.col
			builder.where values.keys.collect {|vid| self.class::Where % [ col, vid.to_s ] }
		end
	else
		b2 = SmqlToAR::And.new builder
		values.keys.each do |vid|
			b2.where SmqlToAR::Or[ *@cols.collect {|col|
					col.joins builder, table
					col = builder.column table+col.path, col.col
					self.class::Where % [ col, vid.to_s ]
				}]
		end
	end
	self
end

#inspect ⇒ Object 



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# File 'lib/smql_to_ar/condition_types.rb', line 124

def inspect
	"#<#{self.class.name}:0x#{(self.object_id<<1).to_s 16} model: #{self.class.name}, cols: #{@cols.inspect}, value: #{@value.inspect}>"
end

#verify ⇒ Object 



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# File 'lib/smql_to_ar/condition_types.rb', line 128

def verify
	@cols.each do |col|
		verify_column col
		verify_allowed col
	end
end

#verify_allowed(col) ⇒ Object

Modelle koennen Spalten/Relationen verbieten mit Model#smql_protected. Dieses muss ein Object mit #include?( name_als_string) zurueckliefern, welches true fuer verboten und false fuer, erlaubt steht.



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# File 'lib/smql_to_ar/condition_types.rb', line 144

def verify_allowed col
	raise_if col.protected?, ProtectedColumnError.new( col)
end

#verify_column(col) ⇒ Object

Gibt es eine Spalte diesen Namens? Oder: Gibt es eine Relation diesen Namens? (Hier nicht der Fall)



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# File 'lib/smql_to_ar/condition_types.rb', line 137

def verify_column col
	raise_unless col.exist_in?, NonExistingColumnError.new( %w[Column], col)
end