Rails Tip : When You Are Testing Model Files without a Database Table Delete Fix...
source link: https://fuzzyblog.io/blog/rails/2022/07/20/rails-tip-when-you-are-testing-model-files-without-a-database-table-delete-fixtures-file.html
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Rails Tip : When You Are Testing Model Files without a Database Table Delete Fixtures File
Jul 20, 2022
I generate a lot of models without ActiveRecord backing. The reason for this is I try and follow a fairly functional style of Ruby coding where I use class methods. The reason I use models for this:
- I don't know what to call them other than a model
- The models directly is auto loaded so I can refresh it with reload! in Rails console
My normal process for this:
- rails g foo
- Delete the migration
- Delete the "< …" at the top i.e. the inherits from ActiveRecord stff; exact syntax varies from Rails version to Rails version
Today I hit this error when running a test and it puzzled me:
Error:
VolumeCommonTest#test_it_should_have_the_right_values_for_cubic_feet_of_water:
ActiveRecord::StatementInvalid: PG::UndefinedTable: ERROR: relation "volume_commons" does not exist
LINE 9: WHERE a.attrelid = '"volume_commons"'::regclass
This actually took me a bit to figure out. Here's the tldr:
- It was coming from bin/rails test test/models/volume_common.rb
- It was the result of the test runner trying to load the fixture file.
The reason this was surprising was that I normally customize each Rails project with ThoughtBot's FactoryBot gem and this time I forgot. FactoryBot suppresses fixture file creation but since I screwed up, it was there and tried to get loaded into a missing table.
And, yes, the error is mine since I didn't read it well but at times like these I wish for a gem called abusive_error messages which sees "PG::UndefinedTable" and shouts out something like:
Yo! Hoser! Where be da database table ?
Ah if there were only infinite time to craft the software tools we really want …
Posted In: #rails #software_testing #flow_analytics
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