validate tag format; rearranged specs

models/comment_thread.rb

@@ -35,7 +35,8 @@ class CommentThread < Content
   validates_presence_of :course_id # do we really need this?
   validates_presence_of :commentable_id
 
-  validate :valid_tag_names
+  validate :tag_names_valid
+  validate :tag_names_unique
 
   after_create :generate_notifications
 
@@ -77,6 +78,10 @@ class CommentThread < Content
     end
   end
 
+  def self.tag_name_valid?(tag)
+    !!(tag =~ RE_TAG)
+  end
+
 private
   def generate_notifications
     if subscribers or (author.followers if author)
@@ -101,9 +106,24 @@ private
     end
   end
 
-  def valid_tag_names
-    unless tags_array.all? {|tag| tag =~ /^\w+(\s*\w+)*$/}
-      errors.add :tag, "must consist of words, numbers, underscores and spaces only"
+  RE_HEADCHAR = /[a-z0-9]/
+  RE_ENDONLYCHAR = /\+/
+  RE_ENDCHAR = /[a-z0-9\#]/
+  RE_CHAR = /[a-z0-9\-\#\.]/
+  RE_WORD = /#{RE_HEADCHAR}(((#{RE_CHAR})*(#{RE_ENDCHAR})+)?(#{RE_ENDONLYCHAR})*)?/
+  RE_TAG = /^#{RE_WORD}( #{RE_WORD})*$/
+
+  
+
+  def tag_names_valid
+    unless tags_array.all? {|tag| self.class.tag_name_valid? tag}
+      errors.add :tag, "can consist of words, numbers, dashes and spaces only and cannot start with dash"
+    end
+  end
+
+  def tag_names_unique
+    unless tags_array.uniq.size == tags_array.size
+      errors.add :tags, "must be unique"
     end
   end
 

spec/api/commentable_spec.rb

@@ -50,26 +50,49 @@ describe "app" do
       end
     end
     describe "POST /api/v1/:commentable_id/threads" do
+      default_params = {title: "Interesting question", body: "cool", course_id: "1", user_id: "1"}
       it "create a new comment thread for the commentable object" do
-        post '/api/v1/question_1/threads', title: "Interesting question", body: "cool", course_id: "1", user_id: "1"
+        post '/api/v1/question_1/threads', default_params
         last_response.should be_ok
         CommentThread.count.should == 3
         CommentThread.where(title: "Interesting question").first.should_not be_nil
       end
       it "allows anonymous thread" do
-        post '/api/v1/question_1/threads', title: "Interesting question", body: "cool", course_id: "1"
+        params = default_params.dup
+        params.delete(:user_id)
+        post '/api/v1/question_1/threads', params
         last_response.should be_ok
         CommentThread.count.should == 3
         CommentThread.where(title: "Interesting question").first.should_not be_nil
       end
       it "create a new comment thread for a new commentable object" do
-        post '/api/v1/does_not_exist/threads', title: "Interesting question", body: "cool", course_id: "1", user_id: "1"
+        post '/api/v1/does_not_exist/threads', default_params
         last_response.should be_ok
         Commentable.find("does_not_exist").comment_threads.length.should == 1
         Commentable.find("does_not_exist").comment_threads.first.body.should == "cool"
       end
       it "create a new comment thread with tag" do
-        post '/api/v1/question_1/threads', title: "Interesting question", body: "cool", course_id: "1", user_id: "1", tags: "a, b, c"
+        post '/api/v1/question_1/threads', default_params.merge(tags: "a, b, c")
+        last_response.should be_ok
+        CommentThread.count.should == 3
+        thread = CommentThread.where(title: "Interesting question").first
+        thread.tags_array.length.should == 3
+        thread.tags_array.should include "a"
+        thread.tags_array.should include "b"
+        thread.tags_array.should include "c"
+      end
+      it "strip spaces in tags" do
+        post '/api/v1/question_1/threads', default_params.merge(tags: " a, b ,c ")
+        last_response.should be_ok
+        CommentThread.count.should == 3
+        thread = CommentThread.where(title: "Interesting question").first
+        thread.tags_array.length.should == 3
+        thread.tags_array.should include "a"
+        thread.tags_array.should include "b"
+        thread.tags_array.should include "c"
+      end
+      it "accepts [a-z 0-9 + # - .]words, numbers, dashes, spaces but no underscores in tags" do
+        post '/api/v1/question_1/threads', default_params.merge(tags: "artificial-intelligence, machine-learning, 7-is-a-lucky-number, interesting problem")
         last_response.should be_ok
         CommentThread.count.should == 3
         thread = CommentThread.where(title: "Interesting question").first

spec/api/search_spec.rb

@@ -0,0 +1,54 @@
+require 'spec_helper'
+
+describe "app" do
+  describe "search" do
+    before(:each) { init_without_subscriptions }
+    describe "GET /api/v1/search/tags" do
+      it "returns all threads tagged with all tags" do
+        require 'uri'
+        thread1 = CommentThread.all.to_a.first
+        thread2 = CommentThread.all.to_a.last
+        ai = "artificial intelligence"
+        ml = "marchine learning"
+        random1 = "random1"
+        random2 = "random2"
+        random3 = "random3"
+        thread1.tags = [ai, ml, random1].join ","
+        thread1.save
+        thread2.tags = [ai, ml, random2].join ","
+        thread2.save
+
+        post "/api/v1/search/tags", tags: [ai, ml]
+        last_response.should be_ok
+        threads = parse last_response.body
+        threads.length.should == 2
+        threads.select{|t| t["id"] == thread1.id.to_s}.first.should_not be_nil
+        threads.select{|t| t["id"] == thread2.id.to_s}.first.should_not be_nil
+
+        post "/api/v1/search/tags", tags: [ai]
+        last_response.should be_ok
+        threads = parse last_response.body
+        threads.length.should == 2
+        threads.select{|t| t["id"] == thread1.id.to_s}.first.should_not be_nil
+        threads.select{|t| t["id"] == thread2.id.to_s}.first.should_not be_nil
+
+        post "/api/v1/search/tags", tags: [ai, random1]
+        last_response.should be_ok
+        threads = parse last_response.body
+        threads.length.should == 1
+        threads.select{|t| t["id"] == thread1.id.to_s}.first.should_not be_nil
+
+        post "/api/v1/search/tags", tags: [random1]
+        last_response.should be_ok
+        threads = parse last_response.body
+        threads.length.should == 1
+        threads.select{|t| t["id"] == thread1.id.to_s}.first.should_not be_nil
+
+        post "/api/v1/search/tags", tags: [random1, random2]
+        last_response.should be_ok
+        threads = parse last_response.body
+        threads.length.should == 0
+      end
+    end
+  end
+end

spec/models/comment_thread.rb

@@ -0,0 +1,23 @@
+require 'spec_helper'
+
+describe CommentThread do
+  it "validates tag name" do
+    CommentThread.tag_name_valid?("a++").should be_true
+    CommentThread.tag_name_valid?("a++ b++ c++").should be_true
+    CommentThread.tag_name_valid?("a#b+").should be_true
+    CommentThread.tag_name_valid?("a##").should be_true
+    CommentThread.tag_name_valid?("a#-b#").should be_true
+    CommentThread.tag_name_valid?("000a123").should be_true
+    CommentThread.tag_name_valid?("artificial-intelligence").should be_true
+    CommentThread.tag_name_valid?("artificial intelligence").should be_true
+    CommentThread.tag_name_valid?("well-known formulas").should be_true
+
+    CommentThread.tag_name_valid?("a#+b#").should be_false
+    CommentThread.tag_name_valid?("a# +b#").should be_false
+    CommentThread.tag_name_valid?("--a").should be_false
+    CommentThread.tag_name_valid?("artificial_intelligence").should be_false
+    CommentThread.tag_name_valid?("#this-is-a-tag").should be_false
+    CommentThread.tag_name_valid?("_this-is-a-tag").should be_false
+    CommentThread.tag_name_valid?("this-is+a-tag").should be_false
+  end
+end