Custom rake task for DB: Table not found

问题

I have a custom rake task, that creates a development DB with data for various situation. The core looks like this:

namespace :db do
  task setup_seed: :environment do
    Rake::Task['db:drop'].invoke
    Rake::Task['db:create'].invoke
    Rake::Task['db:schema:load'].invoke
    Rake::Task['db:migrate'].invoke
    Rake::Task['db:test:prepare'].invoke
    Rake::Task['db:seed'].invoke
  end
end

Everything runs fine, until db:seed is invoked, because it throws an error that tables does not exist. This is my seed.rb:

puts Rails.env
# => development
puts Article.count
# rake aborted!
# Mysql2::Error: Table 'app_test.articles' doesn't exist: SHOW FULL FIELDS FROM `articles`
# /usr/src/app/db/seeds.rb:2:in `<top (required)>'
# /usr/src/app/Rakefile:16:in `block (2 levels) in <top (required)>'
# Tasks: TOP => db:seed

I noticed two strange things here:

First of all it doesn't find the table articles (or any table). When I halt at the beginning of my seed file and look into the DB (development), the tables are present, but the test db is empty
I've printed the Rails.env and it returns development. However the failure message states that it tries to load the DB app_test.articles and not app_development.articles.

So I think this two issues are related.

回答1:

It looks like you are running your rake task in development environment, but db:test:prepare runs in test by default. Try invoking:

RAILS_ENV=test rake db:setup_seed

回答2:

I found the solution myself. The problem was, that the task Rake::Task['db:test:prepare'].invoke changes the environment to test, so putting that line to the bottom of the script and everything works:

namespace :db do
  task setup_seed: :environment do
    Rake::Task['db:drop'].invoke
    Rake::Task['db:create'].invoke
    Rake::Task['db:schema:load'].invoke
    Rake::Task['db:migrate'].invoke
    Rake::Task['db:seed'].invoke
    Rake::Task['db:test:prepare'].invoke # this one should be at the bottom
  end
end

来源：https://stackoverflow.com/questions/36125355/custom-rake-task-for-db-table-not-found

标签

mysql

ruby-on-rails

ruby

rake

rake-task