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Ruby ActiveRecord Basics Migrations and Relationships Relationships

Posted by mv
mv
3,664 Points

cannot run t.update_attributes(employee: e)

When the command in title is run the following error results:

>t.update_attributes(employee: e)
   (0.3ms)  BEGIN
   (0.2ms)  ROLLBACK
ActiveRecord::UnknownAttributeError: unknown attribute: employee
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activerecord-4.1.6/lib/active_record/attribute_assignment.rb:50:in `rescue in _assign_attribute'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activerecord-4.1.6/lib/active_record/attribute_assignment.rb:45:in `_assign_attribute'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activerecord-4.1.6/lib/active_record/attribute_assignment.rb:32:in `block in assign_attributes'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activerecord-4.1.6/lib/active_record/attribute_assignment.rb:26:in `each'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activerecord-4.1.6/lib/active_record/attribute_assignment.rb:26:in `assign_attributes'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activerecord-4.1.6/lib/active_record/persistence.rb:231:in `block in update'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activerecord-4.1.6/lib/active_record/transactions.rb:329:in `block in with_transaction_returning_status'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract/database_statements.rb:201:in `block in transaction'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract/database_statements.rb:209:in `within_new_transaction'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract/database_statements.rb:201:in `transaction'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activerecord-4.1.6/lib/active_record/transactions.rb:208:in `transaction'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activerecord-4.1.6/lib/active_record/transactions.rb:326:in `with_transaction_returning_status'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activerecord-4.1.6/lib/active_record/persistence.rb:230:in `update'
    from (irb):54
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/railties-4.1.6/lib/rails/commands/console.rb:90:in `start'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/railties-4.1.6/lib/rails/commands/console.rb:9:in `start'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/railties-4.1.6/lib/rails/commands/commands_tasks.rb:69:in `console'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/railties-4.1.6/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/railties-4.1.6/lib/rails/commands.rb:17:in `<top (required)>'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:247:in `require'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:247:in `block in require'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:232:in `load_dependency'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:247:in `require'
    from /home/veeni/biller/bin/rails:8:in `<top (required)>'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:241:in `load'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:241:in `block in load'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:232:in `load_dependency'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:241:in `load'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /home/veeni/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from -e:1:in `<main>'irb(main):055:0> t.update_attributes(employee: e)^C

1 Answer

Daniel Reedy
Daniel Reedy
25,284 Points

When you use #update_attributes you are setting the attributes values but #employee is actually a relationship. If you want to use #update_attributes you'd need to set set the employee_id attribute, rather than employee.

Knowing this you have two options.

Option 1: Use #update_attributes 

t.update_attributes(employee_id: e.id)

Options 2: Use #employee= and #save 

t.employee = e
t.save