I have already read The Basics Of Creating Rails Plugins and several other articles, but I can't find how to supply a model with a gem.
Say, I want to make a gem for tagging (yes, I know about acts_as_taggable_on gem, I need different functionality). So, I want the model Tag
to be bundled in the gem. I found no tutorial explaining that.
Of course I tried to reverse-engineer acts_as_taggable_on gem to understand how does it work, but it brought even more confusion: the tutorial I mentioned above says that I should have a dummy app in my gem, in order to test the gem. BUT, acts_as_taggable_on has no such dummy application! How how does it get tested, then?
About the model: ok, I see the file lib/acts_as_taggable_on/tag.rb
that seems to be a Tag
model:
module ActsAsTaggableOn
class Tag < ::ActiveRecord::Base
# ..........................
end
end
I see that file lib/acts-as-taggable-on.rb
requires tag
:
require "acts_as_taggable_on/tag"
So I've applied the same approach (assume my plugin is named dftags) :
I have added file lib/dftags/tag.rb
:
module Dftags
class Tag < ::ActiveRecord::Base
# attr_accessible :title, :body
end
end
And my lib/dftags.rb
looks like this:
module Dftags
end
require "dftags/tag"
I have specs tag_spec.rb
:
require 'spec_helper'
describe Tag do
let(:tag) { Tag.new(name: "") }
it { should validate_presence_of :name }
end
And when I run bundle exec rspec spec/
, I got error unitialized constant Tag (NameError)
.
It seems I missed something important. Plus, again, I have dummy app for testing, but acts_as_taggable_on doesn't; so, the testing approach should be different..
So, the questions:
How can I test my gem without dummy app?
The dummy app is only a helper that allows you to use your normal rails testing workflow when building a gem / plugin. You could run the tests without a dummy app but you would need a lot more manual work.
acts_as_taggable_on
is pretty much active_record
only with the exception of a single helper (as far as I can tell from a quick glance). The author therefore decided that the overhead of maintaining the dummy app was not worth the effort and is setting up active_record
by hand. See here https://github.com/mbleigh/acts-as-taggable-on/blob/master/spec/spec_helper.rb#L24 how he establishes the connection to the database.
This code would not be necessary when using a dummy app as rails is taking care of it.
The same is true for the helper. Instead of using the test methods provided by rails he creates a new Class that includes the helper and uses an instance of this class to test it (h/acts-as-taggable-on/blob/master/spec/acts_as_taggable_on/tags_helper_spec.rb#L11).
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