How to reset a single table in rails?

rails truncate table
rails db:reset
rails drop table
rails truncate table from console
rails truncate postgres table
rails db:drop
rails truncate table cascade
drop table command in rails

I want the primary key values to start from 1 again.

To reset the index/primary key in SQLite just type:

$ rails console
> ActiveRecord::Base.connection.execute("DELETE from sqlite_sequence where name = 'yourtablename'")

How do you reset only a specific table in rails, You might be better off creating a rake task for this. You could even namespace it inside of 'db' if you wanted. ie rake db:� class CreateJobLevels < ActiveRecord::Migration[5.0] def up create_table :job_levels do |t| t.integer :id t.string :name t.timestamps end JobLevel.reset_column_information %w{assistant executive manager director}.each do |type| JobLevel.create(name: type) end end def down drop_table :job_levels end end

A lot of people (like me) come here to find how to delete all the data in the table. Here you go:

$ rails console

> ModelName.delete_all


> ModelName.destroy_all

destroy_all checks dependencies and callbacks, and takes a little longer. delete_all is a straight SQL query.

More info here:

Rails - Clear table and reset auto_increment (Example), Rails Migrations were introduced to be a convenient way to alter the Rename a column; Rename a model; Reset your database a lot of data at a time, there is no one line generator to drop entire tables. This can be used for example, to alternate classes for table rows. You can use named cycles to allow nesting in loops. Passing a Hash as the last parameter with a :name key will create a named cycle. The default name for a cycle without a :name key is "default". You can manually reset a cycle by calling reset_cycle and

I've been using the following from rails console to delete everything in the table and then reset the index counter (Ruby 2 & Rails 4):

> ModelName.delete_all
> ActiveRecord::Base.connection.reset_pk_sequence!('plural_model_name')

Rails Migrations Tricks [Guide + Code] — Cheatsheet included, Rolling Back; Resetting the Database; Running Specific Migrations; Running This migration adds a table called products with a string column called name and a text Migrations are stored as files in the db/migrate directory, one for each� Deletes the records matching conditions without instantiating the records first, and hence not calling the destroy method nor invoking callbacks. This is a single SQL DELETE statement that goes straight to the database, much more efficient than destroy_all.

@khelll's link is helpful. The command you want to truncate one table is:

ActiveRecord::Base.connection.execute("TRUNCATE #{table_name}")

Active Record Migrations — Ruby on Rails Guides, How do I delete a table I'm using Model.delete_all in the Rails console to How to reset a single table in rails?, To reset the index/primary key in SQLite just� Active Record BasicsThis guide is an introduction to Active Record.After reading this guide, you will know: What Object Relational Mapping and Active Record are and how they are used in Rails. How Active Record fits into the Model-View-Controller paradigm. How to use Active Record models to manipulate data stored in a relational database. Active Record schema naming conventions. The concepts

Since Rails 4.2 you can use truncate directly on an ActiveRecord connection:


This wipes all data and resets the autoincrement counters in the table. Works in MySQL and Postgres, does not work in Sqlite.

Rails way to reset seed on id field, In Rails, when you want to create a table (probably a model), you can do it like: Rails are not able to restore data, because they convert a Ruby code into There is one more cool thing in migrations; if you want to revert one� The standard table slide, used for opening and extending standard four leg tables, consists of a series of parallel boards that are able to slide back and forth on smooth joinery with a male and female butterfly notch. Our table slides for standard tables accommodate openings from 26" to 120".

Why Reversible Migrations Are Important and How to Write Them , You'll often make mistakes when coding so it's important to know how to undo things quickly. Of course you can press ctrl-Z to undo your last code edit, but what � I've had a number of problems with Entity Framework Migrations getting out of whack to the point were I can't get the database and the migrations into sync to accept new changes. I've found that rather than spending hours fixing out of whack migrations it's sometimes much easier to simply wipe the slate clean and create a new initial migration. This post describes the steps on how to remove

Undoing Things in Rails, During development, you might find yourself needing to delete everything from a specific database table to refresh your data. You could drop� A fix for this is to create a local model within the migration. This keeps rails from running the validations, so that the migrations run to completion. When using a faux model, it’s a good idea to call Product.reset_column_information to refresh the ActiveRecord cache for the Product model prior to updating data in the database.

Ruby-on-rails: deleting all data from a table, Allows resetting the id of an AR table to 0. splendeo/activerecord-reset-pk- sequence. If you don't have one you can create it directly with rails as shown. This is a complete tutorial for creating join table in Ruby on Rails. It will show how to generate and create a join table and how to address associations between different models. It will also show you how to write a form with multiple select boxes and how to handle it in the controller. Step 1: Creating a migration

  • taking inspiration from your answer... Person.connection.execute('delete from people' ) Person.connection.execute("update sqlite_sequence set seq = 0 where name = 'People'" )
  • In case anyone tried this and got an error, I did ActiveRecord::Base.connection.execute("DELETE from 'yourtablename'") and it worked because it would give me an error that said sqlite_sequence where name = 'yourtablename' is not a valid table name or something like that.
  • This solution resets the table entries, but not the primary key.
  • Yeah this is great -- but I want to the reset the index! Neither delete_all or destroy_all is resetting the index to 1.
  • This answer solved the question of the majority users who reached it. That's what really matters. Besides that, It's not the only answer and it's not flagged as the correct one. The author also explained his intention. So I don't see any problem.
  • This worked really well for me, but a small detail is that your model_name in the reset command needs to plural, like the actual name of the table NOT the singular name of the model.
  • Also works with the symbolic version: ActiveRecord::Base.connection.reset_pk_sequence!(:plural_model_name).