Class: Lore::GUI::Form_Generator

Inherits:
Object
  • Object
show all
Defined in:
lib/lore/gui/form_generator.rb

Overview

A factory rendering Aurita::GUI:Form instances for Aurita::Model classes.

Usage: 

generator = Lore_Form_Generator.new(Some_Lore_Model)
generator.params = { :action => '/aurita/dispatch', :onsubmit => "alert('submitting'); " }
generator.generate
puts generator.form

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(klass = nil) ⇒ Form_Generator

Returns a new instance of Form_Generator.



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# File 'lib/lore/gui/form_generator.rb', line 24

def initialize(klass=nil)
  @klass           = klass
  @labels          = {}
  @params          = {}
  @custom_elements = {}
  @form            = false
end

Instance Attribute Details

#custom_elements ⇒ Object

Returns the value of attribute custom_elements.



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# File 'lib/lore/gui/form_generator.rb', line 22

def custom_elements
  @custom_elements
end

#form ⇒ Object (readonly)

Returns the value of attribute form.



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# File 'lib/lore/gui/form_generator.rb', line 21

def form
  @form
end

#klass ⇒ Object (readonly)

Returns the value of attribute klass.



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# File 'lib/lore/gui/form_generator.rb', line 21

def klass
  @klass
end

#labels ⇒ Object

Returns the value of attribute labels.



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# File 'lib/lore/gui/form_generator.rb', line 22

def labels
  @labels
end

#params ⇒ Object

Returns the value of attribute params.



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# File 'lib/lore/gui/form_generator.rb', line 22

def params
  @params
end

Instance Method Details

#generate ⇒ Object 



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# File 'lib/lore/gui/form_generator.rb', line 37

def generate
  @form = Aurita::GUI::Form.new(@params)

  @klass.get_attributes.each_pair { |table, attributes|
    attributes.each { |attribute|
      label_tag    = table.gsub('.','--') << '--' << attribute
      label        = @labels[label_tag]
      label      ||= label_tag
      full_attrib  = table + '.' << attribute
      field_name   = full_attrib.gsub('.','_')
      form_element = false
      
      # @custom_elements is a hash mapping attribute names to
      # Custom_Element instances. 
      if ((@custom_elements[table]) and
          (@custom_elements[table][attribute])) then
        
        form_element = @custom_elements[table][attribute].new(table, attribute, label)
        
      elsif (@klass.get_primary_keys[table].nil? or                      # Ignore primary key attributes
             !@klass.get_primary_keys[table].include? attribute) and        
            (@klass.get_implicit_attributes[table].nil? or               # Ignore implicit attributes
             !@klass.get_implicit_attributes[table].include? attribute) and 
            (@klass.get_has_a_klasses.nil? or                            # Ignore attributes aggregated via has_a associations (added later)
             @klass.get_has_a_klasses[table+'.'+attribute].nil?) and        
            (@klass.get_hidden_attributes[table].nil? or                 # Ignore otherwise hidden attributes
             !@klass.get_hidden_attributes[table].include? attribute)
      then
      # Attribute has to be added to form, according to data type
        case @klass.get_attribute_types[table][attribute]
        when Lore::PG_BOOL
          form_element = Radio_Field.new(:label => label, 
                                         :name  => field_name, 
                                         :options => { 't' => 'yes', 'f' => 'no' } )
          
        when Lore::PG_SMALLINT || Lore::PG_INT
          form_element = Input_Field.new(:label => label, :name => field_name)
        when Lore::PG_VARCHAR
          form_element = Input_Field.new(:label => label, :name => field_name)
        when Lore::PG_TEXT
          form_element = Textarea_Field.new(:label => label, :name => field_name)
        when Lore::PG_TIMESTAMP_TIMEZONE
          form_element = Datetime_Field.new(:label => label, :name => field_name, :date_format => 'dmy', :time_format => 'hms', :year_range => (2009..2020))
        when Lore::PG_DATE
          form_element = Date_Field.new(:label => label, :name => field_name, :date_format => 'dmy', :year_range => (2009..2020))
        else
          form_element = Input_Field.new(:label => label, :name => field_name)
        end

      elsif (!@klass.get_has_a_klasses.nil? and
             !@klass.get_has_a_klasses[full_attrib].nil?)
      then 
        foreign_klass   = @klass.get_has_a_klasses[full_attrib]
        form_element    = Model_Select_Field.new(foreign_klass, :label => label, :name => field_name)

      elsif (!@klass.get_aggregate_klasses.nil? and
             !@klass.get_aggregate_klasses[full_attrib].nil?)
      then 
        foreign_klass   = @klass.get_aggregate_klasses[full_attrib]
        form_element    = Model_Select_Field.new(foreign_klass, :label => label, :name => field_name)
        
        # Attribute is explixit (expected/required) but not 
        # catched before -> Add attribute as hidden field: 
      elsif (!@klass.get_explicit_attributes[table].nil? and 
             @klass.get_explicit_attributes[table].include? attribute)
      then
        form_element    = Hidden_Field.new(:name => field_name)

      elsif (!@klass.get_implicit_attributes[table].nil? and 
             @klass.get_implicit_attributes[table].include? attribute)
      then
        # Implicit field, ignored
      end

      @form.add(form_element) if form_element
    }
  }
end