send emails to users that are mentioned in bucket comments

app/controllers/comments_controller.rb

@@ -9,7 +9,35 @@ def index
 
   api :POST, '/comments'
   def create
-    comment = Comment.create(comment_params)
+    body = comment_params[:body]
+    comment = Comment.create(body: body, user_id: comment_params[:user_id], bucket_id: comment_params[:bucket_id])
+
+    # convert markdown body to html
+    markdown = Redcarpet::Markdown.new(Redcarpet::Render::HTML, extensions = {})
+    red_body = markdown.render(body)
+
+    # break the html into fragments
+    noko_body = Nokogiri::HTML.fragment(red_body)
+
+    # get an array of all the user ids from the link values
+    user_links = noko_body.css("a").map {|a|
+      a.attributes.values[0].value.sub! 'uid:', ''
+    }
+
+    # format the links with the correct base url
+    noko_body.css("a").map do |a|
+      a['href'].sub! 'uid:', ''
+      a.attributes["href"].value = "#{Rails.application.config.action_mailer.default_url_options[:host]}/##{a['href'].sub! 'uid:', '/users/'}"
+    end
+
+    if user_links
+      email_body = noko_body.to_html
+      bucket = Bucket.find(comment_params[:bucket_id])
+      user_links.each do |userId|
+        user = User.find(userId)
+        UserMailer.notify_member_that_they_were_mentioned(author: current_user, member: user, bucket: bucket, body: email_body).deliver_later
+      end
+    end
     if comment.valid?
       render json: [comment]
     else

app/controllers/users_controller.rb

@@ -85,6 +85,12 @@ def me
     render status: 200, json: [current_user]
   end
 
+  api :GET, '/users/:id', 'User details'
+  def show
+    user = User.find(params[:id])
+    render json: user
+  end
+
   private
     def user_params
       params.require(:user).permit(

app/mailers/user_mailer.rb

@@ -113,4 +113,14 @@ def check_transactions_email
       from: "Cobudget Updates <[email protected]>",
       subject: "DB transactions consistency check")
   end
+
+  def notify_member_that_they_were_mentioned(author:, member:, bucket:, body:)
+    @bucket = bucket
+    @group = bucket.group
+    @body = body
+    @author = author
+    mail(to: member.email,
+         from: "Cobudget Updates <[email protected]>",
+         subject: "#{@author.name} mentioned you in the bucket #{@bucket.name}")
+  end
 end

app/models/comment.rb

@@ -6,13 +6,6 @@ class Comment < ActiveRecord::Base
   validates :bucket_id, presence: true
   validates :body, presence: true
 
-  # add helper method to the UserMailer, takes an argument (text) returns rendered text
-  def body_as_markdown
-    renderer = Redcarpet::Render::HTML.new
-    markdown = Redcarpet::Markdown.new(renderer, extensions = {})
-    markdown.render(body).html_safe
-  end
-
   def author_name
     membership = user.membership_for(bucket.group)
     membership.archived? ? "[removed user]" : user.name

app/views/user_mailer/notify_member_that_they_were_mentioned.erb

@@ -0,0 +1,7 @@
+<p>
+  <%= @author.name %> mentioned you in the bucket <%= link_to "#{@bucket.name}", "#{root_url}#/buckets/#{@bucket.id}" %> in <%= @group.name %>.
+</p>
+
+<p>
+  <%= render html: @body.html_safe %>
+</p>

config/routes.rb

@@ -6,7 +6,7 @@
       sessions: 'overrides/sessions'
     }
 
-    resources :users, only: :create, defaults: { format: :json } do
+    resources :users, only: [:show, :create], defaults: { format: :json } do
       collection do
         post :confirm_account
         post :request_password_reset