instance method
accessed_fields
Ruby on Rails edge
Since v5.0.7.2Signature
accessed_fields()Returns the name of all database fields which have been read from this model. This can be useful in development mode to determine which fields need to be selected. For performance critical pages, selecting only the required fields can be an easy performance win (assuming you aren’t using all of the fields on the model).
For example:
“‘ class PostsController < ActionController::Base
after_action :print_accessed_fields, only: :index
def index
@posts = Post.all
end
private
def print_accessed_fields
p @posts.first.accessed_fields
end
end “‘
Which allows you to quickly change your code to:
“‘ class PostsController < ActionController::Base
def index
@posts = Post.select(:id, :title, :author_id, :updated_at)
end
end “‘
Source
# File activerecord/lib/active_record/attribute_methods.rb, line 525
def accessed_fields
@attributes.accessed
end
Defined in activerecord/lib/active_record/attribute_methods.rb line 525
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Defined in ActiveRecord::AttributeMethods