Puma and Rails - Prevent Duplicate Records WITHOUT Database Indexes

Puma and Rails - Prevent Duplicate Records WITHOUT Database Indexes

By : zettsett
Date : November 17 2020, 11:58 AM
wish help you to fix your issue Use a transaction.
Inside transaction
code :

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Correct way of prevent duplicate records in Rails

Correct way of prevent duplicate records in Rails

By : DarkCowofWar
Date : March 29 2020, 07:55 AM
wish helps you Validations are done by Rails before the record would hit the database. If the record fails a validation, it won't save, and .save will return false, which will cause the else clause of your controller to execute. That clause usually rerenders the page that was submitted, with the errors displayed so they can be corrected.
Assuming that your controller is built like that, you don't need to do anything else. You should, naturally, make sure that any database constraints are mirrored in your validations, otherwise a record might pass validations but produce an error from violating a constraint when it was saved.
How to prevent duplicate records in Rails within a bookmark table?

How to prevent duplicate records in Rails within a bookmark table?

By : Wesley Sabino
Date : March 29 2020, 07:55 AM
help you fix your problem I have a pins table (like standard posts) and users are able to 'bookmark' each pin. However, I want to stop users from bookmarking the same pin multiple times, as it creates duplicate records. , You can add uniqee validation:
code :
class Bookmark < ActiveRecord::Base

  belongs_to :user
  belongs_to :pin

  validates :pin_id, uniqueness: { scope: :user_id }

add_index :bookmarks, [:pin_id, :user_id], unique: true
How to prevent duplicate records in Rails

How to prevent duplicate records in Rails

By : user2171933
Date : March 29 2020, 07:55 AM
Any of those help You should use disable_with (Rails 4: Disable submit button after click) and check uniqueness of the record at model- or database-level.
How do i prevent duplicate records in my database while updating records?

How do i prevent duplicate records in my database while updating records?

By : user3599094
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , If your application supports multiple users you need to ensure changes are not made by another user between your check for duplicates and the database update.
The easiest way to do this is as mbeckish suggested, create a UNIQUE constraint on the title column:
code :
ALTER TABLE maindatabase.animelist 
ADD CONSTRAINT U_animelist_TitleAnime UNIQUE (TitleAnime)
void checkData()


    catch (Exception ex)
        MySqlException sqlEx = ex as MySqlExecption;
        // If there is a constraint violation error.
        // (I may have the wrong error number, please test.)
        if (sqlEx != null && sqlEx.Number == 1062) 
            my = Form.ActiveForm as MyList;
            my.msg = new Message_Box();
            my.msg.Descrip.Text = "Record is already in the Database";
            my.msg.Title.Text = "Duplicate Record";
            MessageBox.Show("" + ex);
Prevent duplicate has_many records in Rails 5

Prevent duplicate has_many records in Rails 5

By : Sid
Date : March 29 2020, 07:55 AM
I hope this helps you . There's not a super clean way to do this with AR validations when you're batch inserting, but you can do it manually with the following steps.
Make a single query to the database using a Postgresql VALUES list to load any potentially duplicate records. Compare the records you are about to batch create and pull out any duplicates Manually generate and return your error message
code :
# Build array of uniq attribute pairs we want to check for
uniq_attrs = new_collection.map do |record|

# santize the values and create a tuple like ('Monday', 5)
values = uniq_attrs.map do |attrs|
  safe = attrs.map {|v| ActiveRecord::Base.connection.quote(v)}
  "( #{safe.join(",")} )"

existing = Preference.where(%{
    (day, client_id) in

# SQL Looks like 
# select * from preferences where (day, client_id) in (('Monday',5), ('Tuesday', 3) ....)
class Preference < ApplicationRecord

  def self.filter_duplicates(collection)
    # blah blah blah from above

    non_duplicates = collection.reject do |record|
      existing.find do |exist|

    [non_duplicates, existing]


  def duplicate?(record)
    record.day == self.day && 
    record.client_id = self.client_id
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