CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-3ruby-on-rails-3.1ruby-on-rails-3.2nested-attributes
logesh
logesh

Reputation: 2672

How to update the nested_attributes with json in rails?

I have 

 class Test < ActiveRecord::Base
        has_many :samples
        accepts_nested_attributes_for :samples
 end

and

 class Sample < ActiveRecord::Base
    belongs_to :tests
 end

Now when i create new value as follows

curl -H 'Content-Type: application/json' -H 'Accept: application/json' -X POST http://localhost:3000/tests.json -d "{\"test\":{\"name\":\"xxxxxx\", \"samples_attributes\":[{\"username\":\"yyyyyyy\",\"age\":\"25\"}]}}"

it creates a new value for the test and it also creates an entry in the sample table but when updating it updates the test table whereas it creates a new entry in the sample table. so how can i make it to update the present entry?

please help me.

Upvotes: 2

Views: 3109

Answers (1)

elmerfreddy
elmerfreddy

Reputation: 151

You need to pass the id in the hash for update records (view API):

class Member < ActiveRecord::Base   
  has_many :posts   
  accepts_nested_attributes_for :posts
end

If the hash contains an id key that matches an already associated record, the matching record will be modified:

member.attributes = {
  name: 'Joe',
  posts_attributes: [
    { id: 1, title: '[UPDATED] An, as of yet, undisclosed awesome Ruby documentation browser!' },
    { id: 2, title: '[UPDATED] other post' }
  ]
}

For each hash that does not have an id key a new record will be instantiated.

params = { member: {
  name: 'joe', posts_attributes: [
    { title: 'Kari, the awesome Ruby documentation browser!' },
    { title: 'The egalitarian assumption of the modern citizen' }
  ]
}}

Upvotes: 8

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