logo
down
shadow

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 :


Share : facebook icon twitter icon
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 }

end
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.
UPD:
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()
{
    SuspendLayout();
    try
    {

        updateData();

    }
    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";
            my.msg.ShowDialog();
        } 
        else 
        {
            MessageBox.Show("" + ex);
        }
    }
    finally
    {
        ResumeLayout();
    }
}
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|
  [
    record.day,
    record.client_id,
  ]
end

# 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(",")} )"
end

existing = Preference.where(%{
    (day, client_id) in
    (#{values.join(",")})
 })

# 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|
        exist.duplicate?(record)
      end
    end

    [non_duplicates, existing]

  end

  def duplicate?(record)
    record.day == self.day && 
    record.client_id = self.client_id
  end
end
Related Posts Related Posts :
  • error even after following Microsoft format in SQL
  • Increase price by percentage, results rounded
  • Can we Use "Case" in a ColdFusion Query-of-Query
  • displaying 'Active' for a row which has 'A' as value
  • Using pattern search in SQL Server Query
  • SQL - how to group transactions for a certain date pattern?
  • How to Index SQL with multiple AND conditions nested inside OR
  • SQL rank with priority
  • Does BigQuery support SubQueries?
  • Any ideas for persisting H2 Database In-Memory mode transaction?
  • How to improve SQL query performance (correlated subqueries)?
  • Filter repeated columns in Oracle
  • SQL Server join on whichever column has value populated
  • use sql stored procedure to insert data which is returned from a query stored in a table
  • Query not working1
  • SQL - using an alias in a where clause in a subquery
  • How to search for a whole word with special char using oracle contains?
  • Production Perfomance of using SELECT * statements?
  • String concatenation not working as expected in SELECT statement
  • How to detect which stored procedures UPDATE or INSERT into a certain TABLE?
  • Select statement inside CASE - SQL
  • .Net Float error 4 - float(4) = 4.44089209850063E-16
  • How to show as column to recursive rows in a table With SQL Server
  • SQL Server error: Column name or number of supplied values does not match table definition
  • How to find a table name which's column name consist cl_
  • Cannot access existing table from WCF Code
  • SQL CREATE VIEW Error
  • Many Statement in the same transaction PLSQL
  • Tables are not joining properly in sql server 2008
  • DB2 how to sum two column from two different table
  • SQL msAccess: list unfinished courses of a student
  • SQL Server delete multiple rows
  • Finding max(date) from the resultant query output
  • updating multiple columns using case statement in sql server
  • Nested SQL query having select subquery in update statement
  • "putting" a certain object to the screen from inside an array
  • Retrieve segment from value
  • Error while creating a table in oracle 11g
  • Transaction with Sequelize doesn't work
  • Search time complexity of this sql query
  • How to return unique records between two tables without using distinct and union?
  • Is it possible to maximum occurences of a value for each key in my table all in one query?
  • Divide table into groups of 5000 based on rank
  • rolling back exec and sp_OA methods
  • How to convert multiple rows to one row in SQL Server?
  • How to use substring and charindex in google query language
  • Find table information where part of column matches char variable
  • Need to retrieve rows from table where the following condition was not satisfied column A = column B and column B = colu
  • Assigning an index to a constraint
  • Retrieve records from multiple Records returned by Sub-Query
  • SQL DELETE group of records based on opposite group being empty
  • SQL GetDate() returns wrong time
  • Total sales amount for customers in cities
  • SQL Server -- updating the `sys.*` tables and not just reading them
  • SQL Order By using concat
  • SQL server 2008 - subquery returned more than one value
  • Group Data Hourly and Insert Into a Summary Table in Postgres
  • Execute SQL Server Pass-Through Query From Access VBA
  • MS Access SQL Transform Aggregate Manipluation of Values for Pivot
  • SQL "if exists..." dynamic query
  • shadow
    Privacy Policy - Terms - Contact Us © ourworld-yourmove.org