PG::InFailedSqlTransaction: 错误: 当前事务被中止，命令被忽略直到事务块结束

Question

I'm trying to run rake db:migrate but I encounter this error:

PG::InFailedSqlTransaction: ERROR: current transaction is aborted, commands ignored until end of transaction block /20150526112018_rename_inquiries_to_mandates.rb:15:in change' /Users/alirezanobakht/.rbenv/versions/2.7.5/bin/bundle:23:in load' /Users/alirezanobakht/.rbenv/versions/2.7.5/bin/bundle:23:in `'

also, my code in the migration file is:

 rename_column :company_inquiries, :inquiry_id, :mandate_id
 add_index :company_inquiries, :mandate_id rescue nil    
 create_join_table :companies, :mandates do |t|
          t.index [:company_id, :mandate_id]
          t.index [:mandate_id, :company_id]
     end

note: I got this error after updating my Rails version to 6.1, and maybe the reason is to write "add_index" just after "rename_column"

Answer 1

It seems to be because of this rescue nil after add_index . You have flow like that:

• Migration begins the transaction
• rename_column - executes some SQL - OK
• add_index - fails for some reason and raises an exception, it should abort the migration, but you're rescuing and ignoring the exception, so it just proceeds
• create_join_table - it tries to execute the SQL statement, but your transaction was already broken on the previous step, so it raises the PG::InFailedSqlTransaction exception

Not quite sure why exactly add_index fails, should work at a first glance, but try removing rescue nil and you should get the real error