ActiveRecord::StatementInvalid: PG::Error: ERROR: null value in column “id” violates not-null constraint

ruby-on-rails-3.1

I am getting the following error frequently in my application. If I restart my rails application this error will not appear for some time.

Rails – 3.1.3

Ruby – 1.9.3

ActiveRecord::StatementInvalid: PG::Error: ERROR: null value in
column "id" violates not-null constraint

Directory.create(:name=>"name",:alias_name=>"name",:site_id=>2,:type=>"Directory")

(0.3ms)  BEGIN
  SQL (0.8ms)  INSERT INTO "databases" ("alias_name", "created_at", "created_by", "id", "name", "site_id", "type", "updated_at", "updated_by") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)  [["alias_name", "name"], ["created_at", Wed, 17 Apr 2013 16:46:25 IST +05:30], ["created_by", nil], ["id", nil], ["name", "name"], ["site_id", 2], ["type", "Directory"], ["updated_at", Wed, 17 Apr 2013 16:46:25 IST +05:30], ["updated_by", nil]]
PG::Error: ERROR:  null value in column "id" violates not-null constraint
: INSERT INTO "databases" ("alias_name", "created_at", "created_by", "id", "name", "site_id", "type", "updated_at", "updated_by") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)
   (0.2ms)  ROLLBACK
ActiveRecord::StatementInvalid: PG::Error: ERROR:  null value in column "id" violates not-null constraint
: INSERT INTO "databases" ("alias_name", "created_at", "created_by", "id", "name", "site_id", "type", "updated_at", "updated_by") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/connection_adapters/postgresql_adapter.rb:1034:in `get_last_result'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/connection_adapters/postgresql_adapter.rb:1034:in `exec_cache'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/connection_adapters/postgresql_adapter.rb:603:in `block in exec_query'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract_adapter.rb:244:in `block in log'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activesupport-3.1.3/lib/active_support/notifications/instrumenter.rb:21:in `instrument'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract_adapter.rb:239:in `log'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/connection_adapters/postgresql_adapter.rb:601:in `exec_query'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract/database_statements.rb:63:in `exec_insert'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract/database_statements.rb:90:in `insert'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract/query_cache.rb:14:in `insert'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/relation.rb:70:in `insert'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/persistence.rb:313:in `create'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/timestamp.rb:51:in `create'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/callbacks.rb:268:in `block in create'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activesupport-3.1.3/lib/active_support/callbacks.rb:390:in `_run_create_callbacks'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activesupport-3.1.3/lib/active_support/callbacks.rb:81:in `run_callbacks'
... 7 levels...
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/validations.rb:50:in `save'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/attribute_methods/dirty.rb:22:in `save'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/transactions.rb:241:in `block (2 levels) in save'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/transactions.rb:295:in `block in with_transaction_returning_status'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/transactions.rb:208:in `transaction'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/transactions.rb:293:in `with_transaction_returning_status'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/transactions.rb:241:in `block in save'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/transactions.rb:252:in `rollback_active_record_state!'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/activerecord-3.1.3/lib/active_record/transactions.rb:240:in `save'
    from (irb):9
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/railties-3.1.3/lib/rails/commands/console.rb:45:in `start'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/railties-3.1.3/lib/rails/commands/console.rb:8:in `start'
    from /home/user/.rvm/gems/ruby-1.9.3-p194-firstversion@web/gems/railties-3.1.3/lib/rails/commands.rb:40:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'1.9.3p194 :010 >

I don't know why id is going as nil in the rails generated SQL.

Can anyone help me please !!! I am struggling lot with this error

Thanks in Advance,

Selva Chezhian

Best Answer

I have same problem once. Here is my problem. I did a 

rake db:schema:dump
rake db:schema:load

and the table got problem as below:

create_table "campaign_line_items_backup", :id => false, :force => true do |t|
  t.integer  "id"
  t.integer  "campaign_id"
  t.integer  "size_id"
  t.text     "name"

it should be 

create_table "campaign_line_items_backup", :force => true do |t|
  t.integer  "campaign_id"
  t.integer  "size_id"
  t.text     "name"

I am not sure about your problem, That's the way I fixed mine.

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