Class: Lore::GUI::Klass_Select

Inherits:
Form_Element show all
Defined in:
lib/lore/gui/form_element.rb

Overview

This klass builts a select box for instances of a given klass. Needed for aggregates, has_a relationships etc. Subclass of Form_Element.

Instance Attribute Summary

Attributes inherited from Form_Element

#attribute_id, #attribute_label, #attribute_name, #attribute_range, #attribute_table, #attribute_value, #id, #mode, #on_change, #on_click, #style, #style_class, #template, #template_file

Instance Method Summary collapse

Methods inherited from Form_Element

for, #label, #onblur, #onfocus, #print, #set_attribute_style, #set_attribute_value, #set_mode, #setup

Constructor Details

#initialize(_klass, _attrib_table, _attrib_name, _attrib_label) ⇒ Klass_Select

{{{



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# File 'lib/lore/gui/form_element.rb', line 568

def initialize(_klass, _attrib_table, _attrib_name, _attrib_label)
  setup(_attrib_table, _attrib_name, _attrib_label, nil, nil)
  @klass = _klass
end

Instance Method Details

#string ⇒ Object 



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# File 'lib/lore/gui/form_element.rb', line 573

def string
  
  # predefs: 
  range         = Array.new
  sublabels     = Array.new
  foreign_label = key_string = nil
  foreign_table = @klass.table_name
  selectables = @klass.select { |foreign|
    foreign.where(true)
    foreign.order_by(@klass.get_primary_keys[foreign_table].first, :asc)
  }
  
  selectables.each { |foreign| 
#       foreign_label = foreign.get_attribute_values[foreign_table][@klass.get_label.split('.')[-1]]
    foreign_label = ''
    if @klass.get_labels.nil? then
      raise ::Exception.new('Specify a label for has_a - related model klasses (here: ' << @klass.to_s + ') via "use_label".')
    end
    @klass.get_labels.each { |label_attrib|
      foreign_label << foreign.get_attribute_values[foreign_table][label_attrib.split('.')[-1]].to_s << ' '
    }
    sublabels.push(foreign_label)

    @klass.get_primary_keys[foreign_table].uniq.each { |keys|
      key_string = ''
      keys.each { |key|
        # concatenate combined primary keys like 'id--id2' -> '3--4'
        if key_string != '' then key_string += '--' end
        key_string += foreign.get_attribute_values[foreign_table][key]
      }
      range.push(key_string)
    }
  }

  select_element = Select.new(@attribute_table, 
                              @attribute_name, 
                              @attribute_label, 
                              range, nil, sublabels)
  select_element.set_attribute_value(@attribute_value)
  select_element.set_attribute_style(@style)
  select_element.set_mode(@mode)

  return select_element.string

end