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ActiveRecordで特定のフィールドをJSON responseから除外する

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modelでas_json()をオーバーライドする。

class User < ActiveRecord::Base
  # ...

  def as_json(opts = {})
    opts[:except] ||= [
      :encrypted_password,
      :gcm_registration_id,
    ]
    super(opts)
  end

これで controller で何も考えずに render json: user とかしていい。

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