Ruby on rails add attribute to existing object from active records

Question

my issue seemed to be an easy one at first but i could not solved it yet, so im getting some records from my DB and then i need to add an attribute to each of those retrieved records. i Try as follow My model ``` class Lesson < ActiveRecord::Base attr_reader :palindrome #getter attr_writer :palindrome #setter attr_accessor :palindrome #both belongs_to :schedule belongs_to :user has_one :schedule end ``` and in my controller im doing this to add it ``` def index @lessons = Lesson.select(:id,:start_date,:users_allowed,:name,:users_enrolled).where(start_date: (Time.now.beginning_of_week.beginning_of_day)..Time.now.end_of_week.end_of_day).order(start_date: :desc) @schedules = Array(Schedule.where(user_id: 50).pluck(:lesson_id)) day_id = params[:id].to_i @day_1 = [] @day_2 = [] @day_3 = [] @day_4 = [] @day_5 = [] @day_6 = [] if day_id.present? @lessons.each do |lesson| lesson.palindrome = 'TEST' case lesson.start_date.wday when 1 @day_1 << lesson when 2 @day_2 << lesson when 3 @day_3 << le…

Accepted Answer

You're passing an Array of ActiveRecord objects, not hashes. The json converter will parse of the attributes of the model instead of custom variables assigned to those objects. Try converting the models to hashes:

```
lesson = lesson.attributes
lesson['palindrome'] = 'TEST'
```

Also consider refactoring your code, I don't think you need those case statements nor the `@dayx` variables which make it hard to understand.

Ruby on rails add attribute to existing object from active records

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