Upsert in Rails ActiveRecord

问题

Does ActiveRecord have a built-in upsert functionality? I know I could write it myself but I obviously don't want to if such a thing already exists.

回答1:

Model.find_or_initialize likely does what you want. You can chain it with save or update_attributes if that makes sense.

More info in the Rails Guides.

回答2:

I just ran across this library: https://github.com/seamusabshere/upsert

I haven't tested it yet, but it looks promising

回答3:

There is an awesome new feature in rails 6: they added upsert and upsert_all to ActiveRecord

More info can be found here https://edgeapi.rubyonrails.org/classes/ActiveRecord/Persistence/ClassMethods.html#method-i-upsert_all

回答4:

There is also Model.find_or_create

回答5:

IMO Upsert mechanism requires custom configuration for each model.

So the best solution would be to implement a custom SQL query for a model, e.g.

insert into <table> (<field_1>, ..., <field_n>) 
  values (<field_1_value>, ..., <field_n_value>)
on duplicate key update
  field_x = field_x_value,
  ...
  field_z = field_z_value;

回答6:

I had written a blog post on how we can achieve this. Check it out here.

You'll have to write an active record extension. It will look something like this.

module ActiveRecordExtension
  extend ActiveSupport::Concern

  def self.upsert(attributes)
    begin
        create(attributes)
    rescue ActiveRecord::RecordNotUnique, PG::UniqueViolation => e
        find_by_primary_key(attributes['primary_key']).
        update(attributes)
    end
  end
end

ActiveRecord::Base.send(:include, ActiveRecordExtension)

来源：https://stackoverflow.com/questions/4695563/upsert-in-rails-activerecord

标签

ruby-on-rails

activerecord

upsert