Class: ARLoader::MethodDetail

Inherits:
Object
  • Object
show all
Defined in:
lib/ar_loader/method_detail.rb

Constant Summary collapse

@@default_values = 
{}
@@prefixes = 
{}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(client_name, klass, operator, type, col_types = {}) ⇒ MethodDetail

Store the raw (client supplied) name against the active record klass(model), operator and types



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# File 'lib/ar_loader/method_detail.rb', line 38

def initialize(client_name, klass, operator, type, col_types = {} )
  @klass, @name = klass, client_name

  if( MethodDetail::type_enum.member?(type.to_sym) )
    @operator_type = type
  else
    raise "Bad operator Type #{type} passed to Method Detail"
  end

  @operator = operator

  # Note : Not all assignments will currently have a column type, for example
  # those that are derived from a delegate_belongs_to
  @col_type = col_types[operator]
end

Instance Attribute Details

#col_type ⇒ Object (readonly)

Name is the raw, client supplied name



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# File 'lib/ar_loader/method_detail.rb', line 33

def col_type
  @col_type
end

#current_value ⇒ Object (readonly)

Name is the raw, client supplied name



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# File 'lib/ar_loader/method_detail.rb', line 33

def current_value
  @current_value
end

#name ⇒ Object (readonly)

Name is the raw, client supplied name



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# File 'lib/ar_loader/method_detail.rb', line 33

def name
  @name
end

#operator ⇒ Object (readonly)

Returns the value of attribute operator.



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# File 'lib/ar_loader/method_detail.rb', line 35

def operator
  @operator
end

#operator_type ⇒ Object (readonly)

Returns the value of attribute operator_type.



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# File 'lib/ar_loader/method_detail.rb', line 35

def operator_type
  @operator_type
end

Class Method Details

.default_value(name) ⇒ Object 



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# File 'lib/ar_loader/method_detail.rb', line 162

def self.default_value(name)
  @@default_values[name]
end

.insistent_method_list ⇒ Object 



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# File 'lib/ar_loader/method_detail.rb', line 179

def self.insistent_method_list
  @insistent_method_list ||= [:to_s, :to_i, :to_f, :to_b]
  @insistent_method_list
end

.prefix_value(name) ⇒ Object 



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# File 'lib/ar_loader/method_detail.rb', line 170

def self.prefix_value(name)
  @@prefixes[name]
end

.set_default_value(name, value) ⇒ Object 



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# File 'lib/ar_loader/method_detail.rb', line 158

def self.set_default_value( name, value )
  @@default_values[name] = value
end

.set_prefix(name, value) ⇒ Object 



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# File 'lib/ar_loader/method_detail.rb', line 166

def self.set_prefix( name, value )
  @@prefixes[name] = value
end

.type_enum ⇒ Object 



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# File 'lib/ar_loader/method_detail.rb', line 19

def self.type_enum
  @type_enum ||= Set[:assignment, :belongs_to, :has_one, :has_many]
  @type_enum
end

Instance Method Details

#assign(record, value) ⇒ Object 



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# File 'lib/ar_loader/method_detail.rb', line 112

def assign(record, value )

  @current_value = validate_value(value)

  puts "WARNING nil value supplied for Column [#{@name}]" if(@current_value.nil?)

  if( operator_for(:belongs_to) )
  
    #puts "DEBUG : BELONGS_TO : #{@name} : #{operator} - Lookup #{@current_value} in DB"
    insistent_belongs_to(record, @current_value)

  elsif( operator_for(:has_many) )

    #puts "DEBUG : HAS_MANY :  #{@name} : #{operator}(#{operator_class}) - Lookup #{@current_value} in DB"
    if(value.is_a?(Array) || value.is_a?(operator_class))
      record.send(operator) << value
    else
      puts "ERROR #{value.class} - Not expected type for has_many #{operator} - cannot assign"
      # TODO -  Not expected type - maybe try to look it up somehow ?"
      #insistent_has_many(record, @current_value)
    end

  elsif( operator_for(:has_one) )

    #puts "DEBUG : HAS_MANY :  #{@name} : #{operator}(#{operator_class}) - Lookup #{@current_value} in DB"
    if(value.is_a?(operator_class))
      record.send(operator + '=', value)
    else
      puts "ERROR #{value.class} - Not expected type for has_one #{operator} - cannot assign"
      # TODO -  Not expected type - maybe try to look it up somehow ?"
      #insistent_has_many(record, @current_value)
    end

  elsif( operator_for(:assignment) && @col_type )
    #puts "DEBUG : COl TYPE defined for #{@name} : #{@assignment} => #{@current_value} #{@col_type.inspect}"
    #puts "DEBUG : COl TYPE CAST: #{@current_value} => #{@col_type.type_cast( @current_value ).inspect}"
    record.send( operator + '=' , @col_type.type_cast( @current_value ) )

  elsif( operator_for(:assignment) )
    #puts "DEBUG : Brute force assignment of value  #{@current_value} supplied for Column [#{@name}]"
    # brute force case for assignments without a column type (which enables us to do correct type_cast)
    # so in this case, attempt straightforward assignment then if that fails, basic ops such as to_s, to_i, to_f etc
    insistent_assignment(record, @current_value)
  end
end

#operator?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ar_loader/method_detail.rb', line 62

def operator?(name)
  operator == name
end

#operator_class ⇒ Object

Return the operator’s expected class, if can be derived, else nil



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# File 'lib/ar_loader/method_detail.rb', line 84

def operator_class()
  @operator_class ||= if(operator_for(:has_many) || operator_for(:belongs_to) || operator_for(:has_one))
    begin
      Kernel.const_get(operator.classify)
    rescue; ""; end

  elsif(@col_type)
    begin
      Kernel.const_get(@col_type.type.to_s.classify)
    rescue; nil; end
  else
    nil
  end

  @operator_class
end

#operator_class_name ⇒ Object

Return the operator’s expected class name, if can be derived, else nil



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# File 'lib/ar_loader/method_detail.rb', line 67

def operator_class_name()
  @operator_class_name ||= if(operator_for(:has_many) || operator_for(:belongs_to) || operator_for(:has_one))
    begin
      Kernel.const_get(operator.classify)
      operator.classify
    rescue; ""; end
  
  elsif(@col_type)
    @col_type.type.to_s.classify
  else
    ""
  end

  @operator_class_name
end

#operator_for(type) ⇒ Object

Return the actual operator’s name for supplied method type where type one of :assignment, :has_one, :belongs_to, :has_many etc



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# File 'lib/ar_loader/method_detail.rb', line 57

def operator_for( type )
  return operator if(@operator_type == type)
  nil
end

#pp ⇒ Object 



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# File 'lib/ar_loader/method_detail.rb', line 174

def pp
  "#{@name} => #{operator}"
end

#validate_value(value) ⇒ Object 



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# File 'lib/ar_loader/method_detail.rb', line 103

def validate_value(value)

  return @@default_values[@name] if(@@default_values[@name])

  return "#{@@prefixes[@name]}#{value}" if(@@prefixes[@name])

  value
end