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create active record query for virtual attribute in Rails 5 or 6

By : Tom J
Date : September 16 2020, 09:00 PM
This might help you If I have a virtual attribute such as full_name, composed of first_name + " " + last_name, and I want to find users with User.where(full_name: "John Whoosiwhatsit"), how can I do this?
code :
User.select("users.*", "CONCAT(users.first_name, ' ', users.last_name) AS full_name")
    .where(full_name: "John Whoosiwhatsit")
# Use an Enterprise DB they said. It will be fun they said.
User.select("users.*", "CONCAT(users.first_name, ' ', users.last_name) AS full_name")
    .where("CONCAT(users.first_name, ' ', users.last_name) = 'John Whoosiwhatsit'")

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Combining Virtual Attributes into one real attribute not saving from view - Active Record

By : Vaters
Date : March 29 2020, 07:55 AM
around this issue It seems that since the attribute :ad_rows was not being passed in the parameters, it was not being recognized as changed by the controller.
I had to add:

How to modify active record query result attribute value in Rails 3

By : Richard Wilkinson
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I am having query , Use strftime() directly on the created_at attribute in the view:
code :

Add Virtual attribute to active record object to output

By : user2488618
Date : March 29 2020, 07:55 AM
this will help You would need to define your own as_json method in the Document model. Something like this would do the trick:
code :
def as_json(options = { })
  h = super(options)
  h[:thumb_url] = file_url(:thumb)

Rails Active Record Query to push two active record relation objects

By : gooogalizer
Date : March 29 2020, 07:55 AM
it should still fix some issue , This will work, but makes at least three SQL calls:
code :
first_user = User.first
last_user = User.last
users = User.where(id: [first_user.id, last_user.id]).paginate

How to create dynamic attribute in rails for Active Record update method

By : Yaniv Rubin
Date : March 29 2020, 07:55 AM
this one helps. Update will call validation, but you need to change how you're building the attribute, as params[:status]: is not a valid construct. Use....
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