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What is :cascade in rails schema.rb and where did it come from?


What is :cascade in rails schema.rb and where did it come from?

By : Rami Keski-Honkola
Date : November 17 2020, 11:55 AM
I wish this help you The docs explain what :cascade does:
code :


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In symfony/doctrine's schema.yml, where should I put onDelete: CASCADE for a many-to-many relationship?

In symfony/doctrine's schema.yml, where should I put onDelete: CASCADE for a many-to-many relationship?


By : Nemesiz
Date : March 29 2020, 07:55 AM
will be helpful for those in need After much trial and error, the only way I was able to get it to work was to follow the suggestion in Jestep's comment and move the relationship definitions including onDelete: CASCADE to the linking table, so in the end it looks like this and behaves how I want it to (deletes cascade from Order to OrderUpgrade, and from Upgrade to OrderUpgrade):
code :
# schema.yml

Order:
  columns:
    order_id: {...}

Upgrade:
  columns:
    upgrade_id: {...}

OrderUpgrade:
  columns:
    order_id: { type: integer, notnull: true, primary: true }
    upgrade_id: { type: integer, notnull: true, primary: true }
  relations:
    Order:
      onDelete: CASCADE
    Upgrade:
      onDelete: CASCADE
Create schema in Symfony 2 and Doctrine 2 with ON DELETE CASCADE

Create schema in Symfony 2 and Doctrine 2 with ON DELETE CASCADE


By : Tevita Bloomfield
Date : March 29 2020, 07:55 AM
I hope this helps you . You should try this, don't forget to modify also the cascade on ORM level.
code :
/**
 * @ORM\ManyToMany(targetEntity="Role", cascade={"persist","remove"})
 * @ORM\JoinTable(name="user_x_role",
 *     joinColumns={@ORM\JoinColumn(name="user_id", referencedColumnName="id", onDelete="CASCADE")},
 *     inverseJoinColumns={@ORM\JoinColumn(name="role_id", referencedColumnName="id", onDelete="CASCADE")},
 * )
 * @var ArrayCollection $roles
 */
protected $roles;
What happens to schema objects when you DROP USER but don't specify CASCADE?

What happens to schema objects when you DROP USER but don't specify CASCADE?


By : Beata Gąsior
Date : March 29 2020, 07:55 AM
seems to work fine If you attempt to drop a user (e.g. THE_USER) without specifying CASCADE you will get the following error:
code :
ORA-01922: CASCADE must be specified to drop 'THE_USER'
Why are my add_foreign_key on_delete: :cascade designations not being transferred to the schema

Why are my add_foreign_key on_delete: :cascade designations not being transferred to the schema


By : mike
Date : March 29 2020, 07:55 AM
With these it helps In an effort to properly handle Postgres's ForeignKeyViolation warnings, I've gone through each of my models and added on_delete: commands as shown below. , When you say this:
code :
t.references :document, foreign_key: true
add_foreign_key :document_images, :documents, on_delete: :cascade
class CreateDocumentImages < ActiveRecord::Migration[5.1]
  def change
    create_table :document_images do |t|
      t.references :document, foreign_key: { on_delete: :cascade }
      t.references :image, foreign_key: { on_delete: :cascade}
      t.timestamps
    end
  end
end
Cascade delete not working if Cascade.persist and Cascade.remove used together in parent Entity in Hibernet

Cascade delete not working if Cascade.persist and Cascade.remove used together in parent Entity in Hibernet


By : Cloud
Date : March 29 2020, 07:55 AM
I hope this helps you . This article seems to describe your problem exactly. If what the author says is still true (the article's from 2010), the problem is that there is a mismatch between what actions JPA and Hibernate expect when persisting. If you're using an older Hibernate implementation, I'd first try upgrading to a newer version as I've never seen the problem in recent versions. If you can't upgrade (for example, you're constrained to using the version of Hibernate provided by your app server) or if upgrading doesn't work, replacing the JPA cascade annotations with the Hibernate cascade annotations may fix your problem. Using Hibernate annotations isn't a great solution because now your code isn't implementation-agnostic, but if it works it works.
What version of Hibernate/JPA/app server are you using?
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