Add service for activity creation

app/models/activity.rb

@@ -32,6 +32,14 @@ class Activity < ApplicationRecord
     subject.nil?
   end
 
+  def message_items
+    values['message_items'].with_indifferent_access.merge(user: owner.id)
+  end
+
+  def html_message
+    I18n.t "activities.#{type_of}", message_items
+  end
+
   private
 
   def activity_version

app/services/activities/create_activity_service.rb

@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+module Activities
+  class CreateActivityService
+    extend Service
+
+    attr_reader :errors, :activity
+
+    def initialize(activity_type:,
+                   owner:,
+                   team:,
+                   project:,
+                   subject:,
+                   message_items: {})
+      @activity = Activity.new
+      @activity.type_of = activity_type
+      @activity.owner = owner
+      @activity.team = team
+      @activity.subject = subject
+      @activity.project = project if project
+      @activity.values = { message_items: message_items }
+
+      @errors = {}
+    end
+
+    def call
+      generate_breadcrumbs
+      @activity.save
+
+      self
+    end
+
+    def succeed?
+      @errors.none?
+    end
+
+    private
+
+    def generate_breadcrumbs
+      @activity.values[:breadcrumbs] = [
+        { team: { id: @activity.team.id, value: @activity.team.name } },
+        { project: { id: @activity.project.id, value: @activity.project.name } }
+      ]
+    end
+  end
+end

spec/services/activities/create_activity_service_spec.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe Activities::CreateActivityService do
+  let(:user) { create :user }
+  let(:team) { create :team, :with_members }
+  let(:project) do
+    create :project, team: team, user_projects: []
+  end
+  let(:service_call) do
+    Activities::CreateActivityService
+      .call(activity_type: :create_project,
+            owner: user,
+            subject: project,
+            team: team,
+            project: project,
+            message_items: { project: project.id })
+  end
+
+  it 'adds new activiy in DB' do
+    expect { service_call }.to(change { Activity.count })
+  end
+end