/SQL/PG::ForeignKeyViolation: ERROR: update or delete on table violates foreign key constraint

PG::ForeignKeyViolation: ERROR: update or delete on table violates foreign key constraint

has_many :comments, dependent: :delete_all - just automatically delete them when the user is deleted

has_many :comments, dependent: :destroy - like above, but call #destroy on each comment instead of just deleting directly in the db

has_many :comments, dependent: :nullify - don't delete comments when the user is deleted, just null out their user_id column

Similar codes

2 votes333 views2 answers
Maximum execution time of 360 seconds exceeded
SQL
0 vote301 views1 answer
Format the money fied with comma in international system using sql
SQL
0 vote319 views1 answer
Oracle exchange partition
SQL
3 votes324 views3 answers
Concatenation in sql
SQL
0 vote345 views1 answer
View t-sql mail configuration
SQL
0 vote317 views1 answer
Pip install mysqlclient error
SQL
1 vote337 views1 answer
Write an SQL query to print details of the Workers whose FIRST_NAME ends with ‘h’ and contains six alphabets.
SQL
0 vote324 views1 answer
Mysql regex select
SQL
0 vote301 views1 answer
Drop check command
SQL
0 vote308 views1 answer
How to to get current date and time in sql
SQL