CODEWITHSUNDEEP
ruby-on-railsserialization
Andy Harvey
Andy Harvey

Reputation: 12653

How to retrieve serialized data?

In a Rails 3.2 app I have a Model with a text column :data. In the model I have: 

class Model
  serialize :data, Hash
end

This is storing data correctly, in the format data:{"attr1"=>"foo", "attr2"=>"bar"....}.

If I want to display this in a show view I can do <%= @model.data %>, and the entire hash is rendered.

But what if I only need to render a specific attribute? Is this possible?

I've tried several approaches that seemed like they might work:

<%= @model.data.attr1 %> - generates undefined method 'attr1' <%- @model.data[:attr1] %> - displays nothing

Am I missing something? . Thanks for any pointers

Upvotes: 3

Views: 1622

Answers (2)

jdoe
jdoe

Reputation: 15771

<%- @model.data[:attr1] %>

Replace with:

<%= @model.data["attr1"] %>

NOTE: <%= at the beginning. You've used <%- mistakenly.

UPD:

I recommend to use the HashWithIndifferentAccess:

serialize :data, HashWithIndifferentAccess

This way you can fetch your values via symbols or strings as the key.

Upvotes: 8

Suborx
Suborx

Reputation: 3669

Did you try the string format of Hash key? 

 @model.data['attr1']

Upvotes: 2

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