Module: TableSalt::MultiparameterAssignment

Included in:
TableSalt
Defined in:
lib/table_salt.rb

Instance Method Summary collapse

Instance Method Details

#assign_multiparameter_attributes(pairs) ⇒ Object

Instantiates objects for all attribute classes that needs more than one constructor parameter. This is done by calling new on the column type or aggregation type (through composed_of) object with these parameters. So having the pairs written_on(1) = “2004”, written_on(2) = “6”, written_on(3) = “24”, will instantiate written_on (a date type) with Date.new(“2004”, “6”, “24”). You can also specify a typecast character in the parentheses to have the parameters typecasted before they’re used in the constructor. Use i for Fixnum, f for Float, s for String, and a for Array. If all the values for a given attribute are empty, the attribute will be set to nil.



77
78
79
80
81
82
83
 
# File 'lib/table_salt.rb', line 77

def assign_multiparameter_attributes( pairs )
  collect_param_parts( pairs ).each do |attribute, parts|
    parts = parts.sort { |a,b| a.first <=> b.first }.map { |k,v| v.to_i }
    instance = instantiate_time_object( attribute, parts )
    send "#{attribute}=", instance
  end
end

#collect_param_parts(pairs) ⇒ Object 



85
86
87
88
89
90
91
92
93
94
95
96
97
98
 
# File 'lib/table_salt.rb', line 85

def collect_param_parts( pairs )
  datetime_params = {}

  pairs.each do |key, value|
    attribute_name, date_part = key.match( /^(.*)\((\di)\)$/ )[1..2]

    if attribute_name
      datetime_params[attribute_name] ||= {}
      datetime_params[attribute_name][date_part] = value
    end
  end

  datetime_params
end

#instantiate_time_object(name, values) ⇒ Object 



100
101
102
103
104
105
106
 
# File 'lib/table_salt.rb', line 100

def instantiate_time_object( name, values )
  DateTime.new *values # this will throw an exception if the date is not valid (Time#local does not)
  Time.zone.local *values
rescue
  self.errors.add name, 'invalid date or time'
  nil
end