Module: JsonRecord::AttributeMethods

Included in:
JsonField
Defined in:
lib/json_record/attribute_methods.rb

Overview

Internal methods for reading and writing fields serialized from JSON.

Instance Method Summary collapse

Instance Method Details

#read_attribute(field, context) ⇒ Object

Read a field. The field param must be a FieldDefinition and the context should be the record which is being read from.



6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
 
# File 'lib/json_record/attribute_methods.rb', line 6

def read_attribute (field, context)
  if field.multivalued?
    arr = json_attributes[field.name]
    unless arr
      arr = EmbeddedDocumentArray.new(field.type, context)
      json_attributes[field.name] = arr
    end
    return arr
  else
    val = json_attributes[field.name]
    if val.nil? and !field.default.nil?
      val = field.default.dup rescue field.default
      json_attributes[field.name] = val
    end
    return val
  end
end

#write_attribute(field, val, context) ⇒ Object

Write a field. The field param must be a FieldDefinition and the context should be the record which is being read from.



26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
 
# File 'lib/json_record/attribute_methods.rb', line 26

def write_attribute (field, val, context)
  if field.multivalued?
    val = val.values if val.is_a?(Hash)
    json_attributes[field.name] = EmbeddedDocumentArray.new(field.type, context, val)
  else
    old_value = read_attribute(field, context)
    converted_value = field.convert(val)
    converted_value.parent = context if converted_value.is_a?(EmbeddedDocument)
    unless old_value == converted_value
      unless field.type.include?(EmbeddedDocument) or Thread.current[:do_not_track_json_field_changes]
        changes = changed_attributes
        if changes.include?(field.name)
          changes.delete(field.name) if converted_value == changes[field.name]
        else
          old_value = (old_value.clone rescue old_value) unless old_value.nil? || old_value.is_a?(Numeric) || old_value.is_a?(Symbol) || old_value.is_a?(TrueClass) || old_value.is_a?(FalseClass)
          changes[field.name] = old_value
        end
      end
      unless converted_value.nil?
        json_attributes[field.name] = converted_value
      else
        json_attributes.delete(field.name)
      end
    end
    context.attributes_before_type_cast[field.name] = val
  end
  return val
end