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author | Rafael Mendonça França <rafaelmfranca@gmail.com> | 2017-08-01 17:34:14 -0400 |
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committer | Rafael Mendonça França <rafaelmfranca@gmail.com> | 2017-08-01 17:34:14 -0400 |
commit | feb1ddae021c38174f9c22bbd1298c8b73431b45 (patch) | |
tree | 09a38695596cf80dc362dd4d93cf94d6f7415e7b /activerecord/test/cases/null_relation_test.rb | |
parent | 3540e60c385286f3517ff56270b31a91ed3024a3 (diff) | |
parent | f9a43f28c087f8ffd35ff7c33a60c938b60f2be2 (diff) | |
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Merge remote-tracking branch 'origin/master' into unlock-minitest
Diffstat (limited to 'activerecord/test/cases/null_relation_test.rb')
-rw-r--r-- | activerecord/test/cases/null_relation_test.rb | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/activerecord/test/cases/null_relation_test.rb b/activerecord/test/cases/null_relation_test.rb new file mode 100644 index 0000000000..17527568f8 --- /dev/null +++ b/activerecord/test/cases/null_relation_test.rb @@ -0,0 +1,84 @@ +# frozen_string_literal: true + +require "cases/helper" +require "models/developer" +require "models/comment" +require "models/post" +require "models/topic" + +class NullRelationTest < ActiveRecord::TestCase + fixtures :posts, :comments + + def test_none + assert_no_queries(ignore_none: false) do + assert_equal [], Developer.none + assert_equal [], Developer.all.none + end + end + + def test_none_chainable + assert_no_queries(ignore_none: false) do + assert_equal [], Developer.none.where(name: "David") + end + end + + def test_none_chainable_to_existing_scope_extension_method + assert_no_queries(ignore_none: false) do + assert_equal 1, Topic.anonymous_extension.none.one + end + end + + def test_none_chained_to_methods_firing_queries_straight_to_db + assert_no_queries(ignore_none: false) do + assert_equal [], Developer.none.pluck(:id, :name) + assert_equal 0, Developer.none.delete_all + assert_equal 0, Developer.none.update_all(name: "David") + assert_equal 0, Developer.none.delete(1) + assert_equal false, Developer.none.exists?(1) + end + end + + def test_null_relation_content_size_methods + assert_no_queries(ignore_none: false) do + assert_equal 0, Developer.none.size + assert_equal 0, Developer.none.count + assert_equal true, Developer.none.empty? + assert_equal true, Developer.none.none? + assert_equal false, Developer.none.any? + assert_equal false, Developer.none.one? + assert_equal false, Developer.none.many? + end + end + + def test_null_relation_metadata_methods + assert_equal "", Developer.none.to_sql + assert_equal({}, Developer.none.where_values_hash) + end + + def test_null_relation_where_values_hash + assert_equal({ "salary" => 100_000 }, Developer.none.where(salary: 100_000).where_values_hash) + end + + [:count, :sum].each do |method| + define_method "test_null_relation_#{method}" do + assert_no_queries(ignore_none: false) do + assert_equal 0, Comment.none.public_send(method, :id) + assert_equal Hash.new, Comment.none.group(:post_id).public_send(method, :id) + end + end + end + + [:average, :minimum, :maximum].each do |method| + define_method "test_null_relation_#{method}" do + assert_no_queries(ignore_none: false) do + assert_nil Comment.none.public_send(method, :id) + assert_equal Hash.new, Comment.none.group(:post_id).public_send(method, :id) + end + end + end + + def test_null_relation_in_where_condition + assert_operator Comment.count, :>, 0 # precondition, make sure there are comments. + assert_equal 0, Comment.where(post_id: Post.none).count + end +end |