add test cases

app/logical/post_query_builder.rb

@@ -149,9 +149,9 @@ class PostQueryBuilder
         relation = relation.where("(posts.source = '' OR posts.source IS NULL)")
       elsif q[:source] =~ /^(pixiv\/|%\.?pixiv(\.net(\/img)?)?(%\/|(?=%$)))(.+)$/
         if $5 == "%"
-            relation = relation.where("substring(posts.source, 'pixiv.net/img.*/([^/]*/[^/]*)$') IS NOT NULL")
+          relation = relation.where("substring(posts.source, 'pixiv.net/img.*/([^/]*/[^/]*)$') IS NOT NULL")
         else
-            relation = relation.where("substring(posts.source, 'pixiv.net/img.*/([^/]*/[^/]*)$') LIKE ? ESCAPE E'\\\\'", $5)
+          relation = relation.where("substring(posts.source, 'pixiv.net/img.*/([^/]*/[^/]*)$') LIKE ? ESCAPE E'\\\\'", $5)
         end
         has_constraints!
       else

db/structure.sql

@@ -5851,6 +5851,20 @@ CREATE INDEX index_posts_on_mpixels ON posts USING btree (((((image_width * imag
 CREATE INDEX index_posts_on_parent_id ON posts USING btree (parent_id);
 
 
+--
+-- Name: index_posts_on_pixiv_id; Type: INDEX; Schema: public; Owner: -; Tablespace: 
+--
+
+CREATE INDEX index_posts_on_pixiv_id ON posts USING btree ((("substring"((source)::text, 'pixiv.net/img.*/([0-9]+)[^/]*$'::text))::integer));
+
+
+--
+-- Name: index_posts_on_pixiv_suffix; Type: INDEX; Schema: public; Owner: -; Tablespace: 
+--
+
+CREATE INDEX index_posts_on_pixiv_suffix ON posts USING btree ("substring"((source)::text, 'pixiv.net/img.*/([^/]*/[^/]*)$'::text) text_pattern_ops);
+
+
 --
 -- Name: index_posts_on_source; Type: INDEX; Schema: public; Owner: -; Tablespace: 
 --
@@ -6210,4 +6224,6 @@ INSERT INTO schema_migrations (version) VALUES ('20130221035518');
 
 INSERT INTO schema_migrations (version) VALUES ('20130221214811');
 
+INSERT INTO schema_migrations (version) VALUES ('20130302214500');
+
 INSERT INTO schema_migrations (version) VALUES ('20130305005138');

test/unit/post_test.rb

@@ -857,6 +857,12 @@ class PostTest < ActiveSupport::TestCase
       assert_equal(post1.id, relation.first.id)
     end
     
+    should "return posts for the <pixiv> metatag" do
+      post = FactoryGirl.create(:post, :source => "http://i1.pixiv.net/img123/img/artist-name/789.png")
+      assert_equal(1, Post.tag_match("pixiv:789").count)
+      assert_equal(0, Post.tag_match("pixiv:790").count)
+    end
+  
     should "return posts for a list of md5 hashes" do
       post1 = FactoryGirl.create(:post, :md5 => "abcd")
       post2 = FactoryGirl.create(:post)
@@ -875,6 +881,14 @@ class PostTest < ActiveSupport::TestCase
       assert_equal(post2.id, relation.first.id)
     end
     
+    should "return posts for a pixiv source search" do
+      post = FactoryGirl.create(:post, :source => "http://i1.pixiv.net/img123/img/artist-name/789.png")
+      assert_equal(1, Post.tag_match("source:pixiv/artist-name/*").count)
+      assert_equal(0, Post.tag_match("source:pixiv/artist-fake/*").count)
+      assert_equal(1, Post.tag_match("source:*.pixiv.net/img*/artist-name/*").count)
+      assert_equal(0, Post.tag_match("source:*.pixiv.net/img*/artist-fake/*").count)
+    end
+  
     should "return posts for a tag subscription search" do
       post1 = FactoryGirl.create(:post, :tag_string => "aaa")
       sub = FactoryGirl.create(:tag_subscription, :tag_query => "aaa", :name => "zzz")