Error Update Or Delete On Table Violates Foreign Key Constraint
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Update Or Delete On Table Violates Foreign Key Constraint Rails
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Update Or Delete On Table Violates Foreign Key Constraint Hibernate
I would like to delete rows which contain a foreign key, but when I try something like this: DELETE FROM osoby WHERE id_osoby='1' I get this statement: ERROR: update or delete on table "osoby" violates foreign key constraint "kontakty_ibfk_1" on table "kontakty" DETAIL: Key (id_osoby)=(1) is still referenced from table "kontakty". How can I delete these rows? sql postgresql foreign-keys share|improve this question edited Jul 1 '15 at 18:49 Brian insert or update on table violates foreign key constraint Tompsett - 汤莱恩 3,091132775 asked Jan 6 '13 at 12:27 Michal Loksik 1461212 Check on this as well on delete cascade ;) It's good to have these settings in your table though.. When creating foreign keys we add parent then child. So when deleting we delete child and then parent ;) –bonCodigo Jan 6 '13 at 12:34 add a comment| 4 Answers 4 active oldest votes up vote 25 down vote accepted To automate this, you could define the foreign key constraint with ON DELETE CASCADE. I quote the the manual of foreign key constraints: CASCADE specifies that when a referenced row is deleted, row(s) referencing it should be automatically deleted as well. share|improve this answer answered Jan 6 '13 at 12:55 Erwin Brandstetter 219k29354465 1 We do not have created tables with ON DELETE CASCADE. I can not change structure of tables. Is there a way that foreign keys are deleted automatically? or we have to follow the way suggested by @juergen d –Varun Jul 30 '15 at 7:08 @Varun: If you can't ALTER the table to add an FK with ON DELETE CASCADE, then deleting by hand (once) or by trigger BEFORE DELETE (every time) are the remaining options. –Erwin Br
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Insert Or Update On Table Violates Foreign Key Constraint Postgresql
About Us Learn more about Stack Overflow the company Business Learn more about sql delete table with foreign key constraint hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join update on table violates foreign key constraint the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up can't delete object due http://stackoverflow.com/questions/14182079/delete-rows-with-foreign-key-in-postgresql to foreign key constraint up vote 7 down vote favorite 1 Trying to do a simple user.destroy but running into the following error: ERROR: update or delete on table "users" violates foreign key constraint "fk_rails_5373344100" on table "identities" DETAIL: Key (id)=(2) is still referenced from table "identities". Here is my migration for Identities class CreateIdentities < ActiveRecord::Migration def change create_table :identities do |t| t.references :user, http://stackoverflow.com/questions/29544693/cant-delete-object-due-to-foreign-key-constraint index: true, foreign_key: true t.string :provider t.string :uid t.timestamps null: false end end end Here is my user and identity model: class Identity < ActiveRecord::Base belongs_to :user validates_presence_of :uid, :provider validates_uniqueness_of :uid, :scope => :provider def self.find_for_oauth(auth) find_or_create_by(uid: auth.uid, provider: auth.provider) end end and user: class User < ActiveRecord::Base TEMP_EMAIL_PREFIX = 'ricky@writeit.com' TEMP_EMAIL_REGEX = /\ricky@writeit.com/ # Include default devise modules. Others available are: # :lockable, :timeoutable devise :database_authenticatable, :registerable, :confirmable, :recoverable, :rememberable, :trackable, :validatable, :omniauthable validates_format_of :email, :without => TEMP_EMAIL_REGEX, on: :update ... end Im new to foreign keys and references, so I'm not sure at all how to fix this. Any help would be greatly appreciated. Thanks ruby-on-rails postgresql share|improve this question asked Apr 9 '15 at 17:03 Ricky Mason 82411741 add a comment| 2 Answers 2 active oldest votes up vote 23 down vote accepted You would need to remove the Identity that references the user first. Then you can delete the user.. By default the foreign key is doing a restrict so you cannot delete the user if anything references to it. if you would like use Rails to handle destroying the identity you can do class User < ActiveRecord::Base has_m
constraint that specifies that the value of a column (or a group of columns) must https://gab.lc/articles/foreign_keys_postgresql match the values of a column in another table. In plain English, if we have two tables, "customer" and "orders", we want foreign keys to make sure orders are entered by valid customers. Foreign key Try it yourself If you would like to try the following examples, please create these 2 tables: -- Create foreign key table -customers- CREATE TEMP TABLE customers ( id serial unique, name text ); -- Add a few customers INSERT INTO customers (name) VALUES ('Tom'), ('Gabriel'), ('Bill'), ('Bob'), ('Jerome'); -- Create table -orders- CREATE TEMP TABLE orders ( id serial unique, customer_id int REFERENCES customers(id), order_description text, order_amount double precision ); Understanding how to create Foreign foreign key constraint Keys Let's have a quick look at the tables we created: gab@test # \d customers Table "pg_temp_2.customers" Column | Type | Modifiers --------+---------+-------------------------------------------------------- id | integer | not null default nextval('customers_id_seq'::regclass) name | text | Indexes: "customers_id_key" UNIQUE CONSTRAINT, btree (id) Referenced by: TABLE "orders" CONSTRAINT "orders_customer_id_fkey" FOREIGN KEY (customer_id) REFERENCES customers(id) gab@test # \d orders Table "pg_temp_2.orders" Column | Type | Modifiers -------------------+------------------+----------------------------------------------------- id | integer | not null default nextval('orders_id_seq'::regclass) customer_id | integer | order_description | text | order_amount | double precision | Indexes: "orders_id_key" UNIQUE CONSTRAINT, btree (id) Foreign-key constraints: "orders_customer_id_fkey" FOREIGN KEY (customer_id) REFERENCES customers(id) The first table, "customers" has an "id" per entry. You have to specify that this "id" is unique in order to use it with a Foreign Key. You can see at the bottom of its structure it says that its "id" is used as a foreign key constraint in the table "orders". The table "orders" includes a column called "customer_id" which is goin