Class: SmqlToAR::Column

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/smql_to_ar.rb

Overview

Eine Spalte in einer Tabelle, relativ zu ‘Column#model`. Kann auch einen Pfad `Column#path` haben, wobei `Column#col` dann eine Relation von dem Model der letzten Relation von `Column#path` ist.

Defined Under Namespace

Classes: Col

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(model, *col) ⇒ Column

Returns a new instance of Column.



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# File 'lib/smql_to_ar.rb', line 151

def initialize model, *col
	@model = model
	@last_model = nil
	*@path, @col = *Array.wrap( col).
			collect {|x| x.to_s.split /[.\/]/ }.
			flatten.
			collect( &Col.method( :new)).
			reject {|x| x === :self }
end

Instance Attribute Details

#col ⇒ Object (readonly)

Returns the value of attribute col.



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# File 'lib/smql_to_ar.rb', line 119

def col
  @col
end

#model ⇒ Object

Returns the value of attribute model.



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# File 'lib/smql_to_ar.rb', line 120

def model
  @model
end

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/smql_to_ar.rb', line 119

def path
  @path
end

Instance Method Details

#allowed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/smql_to_ar.rb', line 213

def allowed?()  ! self.protected?  end

#child? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/smql_to_ar.rb', line 214

def child?()  @path.empty? and !!relation  end

#each ⇒ Object 



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# File 'lib/smql_to_ar.rb', line 165

def each
	model = @model
	@path.each do |rel|
		unless rel === :self
			model = SmqlToAR.model_of model, rel
			return false  unless model
			yield rel, model
		end
	end
	model
end

#exist_in? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/smql_to_ar.rb', line 177

def exist_in?
	model = last_model
	return false  unless model
	model.column_names.include? @col.to_s
end

#inspect ⇒ Object 



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# File 'lib/smql_to_ar.rb', line 211

def inspect()  "#<Column: #{model} #{to_s}>"  end

#joins(builder = nil, table = nil, &exe) ⇒ Object 



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# File 'lib/smql_to_ar.rb', line 194

def joins builder = nil, table = nil, &exe
pp = []
table = Array.wrap table
exe ||= builder ? lambda {|j, m| builder.joins table+j, m} : Array.method( :[])
collect do |rel, model|
	pp.push rel
	exe.call pp, model
end
end

#last_model ⇒ Object 



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# File 'lib/smql_to_ar.rb', line 161

def last_model
	@last_model ||= each{}
end

#length ⇒ Object 



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# File 'lib/smql_to_ar.rb', line 205

def length() @path.length+(self.self? ? 0 : 1)  end

#protected? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/smql_to_ar.rb', line 183

def protected?
	model = @model
	each do |rel, _model|
		pr = Array.wrap model.respond_to?( :smql_protected) ? model.smql_protected : nil
		pr.include? rel.to_s
		model = _model
	end
	pr = Array.wrap model.respond_to?( :smql_protected) ? model.smql_protected : nil
	pr.include? @col.to_s
end

#relation ⇒ Object 



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# File 'lib/smql_to_ar.rb', line 212

def relation()  self.self? ? model : SmqlToAR.model_of( last_model, @col)  end

#self? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/smql_to_ar.rb', line 204

def self?()  !@col  end

#size ⇒ Object 



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# File 'lib/smql_to_ar.rb', line 206

def size()   @path.size+(self.self? ? 0 : 1)  end

#to_a ⇒ Object 



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# File 'lib/smql_to_ar.rb', line 207

def to_a()   @path+(self.self? ? [] : [@col])  end

#to_json ⇒ Object 



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# File 'lib/smql_to_ar.rb', line 210

def to_json()  to_s  end

#to_s ⇒ Object 



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# File 'lib/smql_to_ar.rb', line 208

def to_s()   to_a.join '.'  end

#to_sym ⇒ Object 



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# File 'lib/smql_to_ar.rb', line 209

def to_sym() to_s.to_sym  end