Rails edit serialized JSON data

Question

I have a column that stores JSON data. I don't know how to show it when it is on Edit state.

 serialize :value, JSON

 = f.fields_for :value do |ff|
    .form-group
      = ff.label :short  
      = ff.text_field :short, class: 'form-control'
    .form-group
      = ff.label :long
      = ff.text_field :long, class: 'form-control'

score 30 · Accepted Answer · edited Jun 30 '16 at 11:26

30

In place of

= f.fields_for :value do |ff|

please use the following code:

= f.fields_for :value, OpenStruct.new(@object.value) do |ff|

You will need to replace @object with your model object.

edited Jun 30 '16 at 11:26

Barry

746
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answered Sep 30 '14 at 08:58

Manoj Menon

1,028
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Welcome! To know more about OpenStruct in ruby please take a look at http://stackoverflow.com/questions/1177594/ruby-struct-vs-openstruct :) – Manoj Menon Sep 30 '14 at 09:19
4

You can also use `f.object` to reference the model object in the `OpenStruct` instead of making another fixed reference to your model object (in this case, `@object`). – Barry Jun 30 '16 at 09:19
be careful with `OpenStruct`. afaik, using it at runtime [clears the vm's method cache](https://mensfeld.pl/2015/04/ruby-global-method-cache-invalidation-impact-on-a-single-and-multithreaded-applications/), resulting in performance penalties. – glasz Nov 07 '17 at 23:53

Rails edit serialized JSON data

1 Answers1