add channel to webhooks (#915)

app/models/webhooks/slack/base.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
-Webhooks::Slack::Base = Struct.new(:event) do
+Webhooks::Slack::Base = Struct.new(:webhook, :event) do
   include Routing
 
   def username
@@ -14,6 +14,10 @@ Webhooks::Slack::Base = Struct.new(:event) do
     'something'
   end
 
+  def channel
+    webhook.channel
+  end
+
   def attachments
     [{
       title:       attachment_title,

app/serializers/webhook_serializer.rb

@@ -1,4 +1,9 @@
 # frozen_string_literal: true
 class WebhookSerializer < ActiveModel::Serializer
   attributes :text, :username, :icon_url # , :attachments
+  attribute :channel, if: :has_channel?
+
+  def has_channel?
+    true if object.channel
+  end
 end

app/services/webhook_service.rb

@@ -11,7 +11,7 @@ class WebhookService
     end
 
     def webhook_object_for(webhook, event)
-      "Webhooks::#{webhook.kind.classify}::#{event.kind.classify}".constantize.new(event)
+      "Webhooks::#{webhook.kind.classify}::#{event.kind.classify}".constantize.new(webhook, event)
     end
   end
 end

db/migrate/20161105160340_add_channel_to_webhook.rb

@@ -0,0 +1,5 @@
+class AddChannelToWebhook < ActiveRecord::Migration[5.0]
+  def change
+    add_column :webhooks, :channel, :string
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20161013162214) do
+ActiveRecord::Schema.define(version: 20161105160340) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -276,6 +276,7 @@ ActiveRecord::Schema.define(version: 20161013162214) do
     t.string  "kind",                       null: false
     t.string  "uri",                        null: false
     t.text    "event_types",   default: [],              array: true
+    t.string  "channel"
     t.index ["hookable_type", "hookable_id"], name: "index_webhooks_on_hookable_type_and_hookable_id", using: :btree
   end