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    <p>Very good question. Had me stumped so I dove into the rails source and pulled up <a href="https://github.com/rails/rails/blob/master/activerecord/lib/active_record/railties/databases.rake#L402" rel="noreferrer"><code>database.rake</code></a>. Now it's more clear:</p> <p><code>db:test:clone</code> is just a combination of <code>db:schema:dump</code> and <code>db:test:load</code>:</p> <pre><code>task :clone =&gt; %w(db:schema:dump db:test:load) </code></pre> <p><code>db:test:clone_structure</code> uses the {rails_env}_structure.sql file:</p> <pre><code>task :clone_structure =&gt; [ 'db:structure:dump', 'db:test:purge' ] do # skipped some code, here's what happens for MySQL: ActiveRecord::Base.establish_connection(:test) # ... IO.readlines("#{Rails.root}/db/#{Rails.env}_structure.sql").join.split("\n\n").each do |table| ActiveRecord::Base.connection.execute(table) end end </code></pre> <p><code>db:test:load</code> is the same as <code>db:schema:load</code>, but invokes it on the test database:</p> <pre><code>task :load =&gt; 'db:test:purge' do ActiveRecord::Base.establish_connection(ActiveRecord::Base.configurations['test']) # ... db_namespace['schema:load'].invoke end </code></pre> <p><code>db:test:prepare</code> alerts you if any migrations are pending, and if not, either runs <code>db:test:clone_structure</code> (using the {rails_env}_structure.sql file) or <code>db:test:load</code> (using the schema.rb file), depending on the schema format (this is a little confusing to me, maybe someone else can expand on it):</p> <pre><code>task :prepare =&gt; 'db:abort_if_pending_migrations' do # ... db_namespace[{ :sql =&gt; 'test:clone_structure', :ruby =&gt; 'test:load' }[ActiveRecord::Base.schema_format]].invoke end </code></pre> <p>Hope this clears it up! Again, going through the <a href="https://github.com/rails/rails/blob/master/activerecord/lib/active_record/railties/databases.rake#L402" rel="noreferrer">database.rake</a> file is easy and will clear up any other questions you might have. That link goes to the line that is the beginning of the :test namespace.</p>
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    1. POWhat's the difference between db:test:clone, db:test:clone_structure, db:test:load, and db:test:prepare?
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    1. USbricker
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    1. POWhat's the difference between db:test:clone, db:test:clone_structure, db:test:load, and db:test:prepare?
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    1. COBottom line: They are all pretty much the same thing. :-p
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    2. COwarning -- I found that db:test:clone did not correctly copy the nullability of columns from my development database. This may be an old bug that has subsequently been fixed, as I found it using Rails 2.3.12.
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      1. USJan Hettich
 

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