# Problem with plurals, migrations?

**URL:** <https://www.ruby-forum.com/t/problem-with-plurals-migrations/101904>\
**Category:** Rails\
**Created:** [August 8, 2006, 5:00pm UTC](https://www.ruby-forum.com/t/problem-with-plurals-migrations/101904 "2006-08-08T17:00:03Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![BergerS\_Daniel](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/bc8723/32.png) [@BergerS\_Daniel](https://www.ruby-forum.com/u/BergerS_Daniel)\
**Post date:** [August 8, 2006, 5:00pm UTC](https://www.ruby-forum.com/t/problem-with-plurals-migrations/101904/1 "2006-08-08T17:00:03Z")

</div>

Hi,

Ruby 1.8.4  
Rails 1.1.4  
Windows XP Pro

I’m hitting an issue with migrations that I suspect relates to  
pluralization. Here’s the migration:

class Hardware \< ActiveRecord::Migration  
def self.up  
create\_table :hardware do |h|  
h.column :vendor, :string, :limit =\> 32  
h.column :model, :string, :limit =\> 32  
end

```
  Hardware.create(:vendor => 'Foo', :model => 'Bar')

```

end

def self.down  
drop\_table :hardware  
end  
end

Here’s the model:

class Hardware \< ActiveRecord::Base  
set\_table\_name “hardware”  
has\_many :schedules  
end

When I run the migration the table creation occurs, but then I get this  
error:

– create({:vendor=\>“Foo”, :model=\>“Bar”})  
rake aborted!  
undefined method `create’ for  
#ActiveRecord::ConnectionAdapters::PostgreSQLAdapter:0x39293cc

My guess is that it was expecting a “hardwares” table instead of  
“hardware”, and is getting confused. But, I didn’t see a method in the  
docs to set the table name ala ActiveRecord.

Or am I missing something obvious here? I checked the docs and Google,  
but didn’t find anything.

Below is the full trace.

Thanks,

Dan

rake aborted!  
undefined method `create' for #<ActiveRecord::ConnectionAdapters::PostgreSQLAdapter:0x39293cc> c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/mig ration.rb:272:in`send’  
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active\_record/mig  
ration.rb:272:in `method_mis sing' c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/mig ration.rb:256:in`say\_with\_t  
ime’  
c:/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure' c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/mig ration.rb:256:in`say\_with\_t  
ime’  
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active\_record/mig  
ration.rb:270:in `method_mis sing' ./db/migrate//004_hardware.rb:13:in`real\_up’  
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active\_record/mig  
ration.rb:210:in `migrate' c:/ruby/lib/ruby/1.8/benchmark.rb:293:in`measure’  
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active\_record/mig  
ration.rb:210:in `migrate' c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/mig ration.rb:332:in`migrate’  
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active\_record/mig  
ration.rb:327:in `migrate' c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/mig ration.rb:294:in`up’  
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active\_record/mig  
ration.rb:285:in `migrate' c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.4/lib/tasks/databases.rake:4 c:/ruby/lib/ruby/gems/1.8/gems/rake-0.7.1/lib/rake.rb:387:in`execute’  
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.7.1/lib/rake.rb:387:in `execute' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.7.1/lib/rake.rb:357:in`invoke’  
c:/ruby/lib/ruby/1.8/thread.rb:135:in `synchronize' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.7.1/lib/rake.rb:350:in`invoke’  
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.7.1/lib/rake.rb:1906:in `run' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.7.1/lib/rake.rb:1906:in`run’  
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.7.1/bin/rake:7  
c:/ruby/bin/rake.bat:25

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---

<div class="post-metadata">

**Author:** ![BergerS\_Daniel](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/bc8723/32.png) [@BergerS\_Daniel](https://www.ruby-forum.com/u/BergerS_Daniel)\
**Post date:** [August 8, 2006, 5:21pm UTC](https://www.ruby-forum.com/t/problem-with-plurals-migrations/101904/2 "2006-08-08T17:21:07Z")

</div>

Hi –

On Tue, 8 Aug 2006, Berger, Daniel wrote:

> def self.up  
> end  
> error:

y – create({:vendor=\>“Foo”, :model=\>“Bar”})

> rake aborted!  
> undefined method `create’ for  
> #ActiveRecord::ConnectionAdapters::PostgreSQLAdapter:0x39293cc
> 
> My guess is that it was expecting a “hardwares” table instead of  
> “hardware”, and is getting confused. But, I didn’t see a method in the  
> docs to set the table name ala ActiveRecord.

Could the problem be that you’ve got two classes named Hardware?  
Maybe name the migration class CreateHardware and see what happens.

David

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