noosfero | Custom fields (#708)

[Joenio Costa]

New comment for Merge Request 708

https://gitlab.com/noosfero/noosfero/merge_requests/708#note_2438047


Joenio Costa

maybe would be more interesting to use before_create instead of overwriting the constructor method here, see an example (code not tested):

```ruby
  before_create do |cf_value|
    if cf_value.custom_field && cf_value.customized
      cf_value.value ||= cf_value.custom_field.default_value
    end
  end
```

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