Create `get_build` for project model

Inside of `Projects::ArtifactsController` and
`Projects::BuildArtifactsController` we fetching the build by id using
active record directly which violates `CodeReuse/ActiveRecord` rubocop
rule. Create `get_build` inside of `project` model which does the same
thing.

app/controllers/projects/artifacts_controller.rb

@@ -85,11 +85,9 @@ class Projects::ArtifactsController < Projects::ApplicationController
     end
   end
 
-  # rubocop: disable CodeReuse/ActiveRecord
   def build_from_id
-    project.builds.find_by(id: params[:job_id]) if params[:job_id]
+    project.get_build(params[:job_id]) if params[:job_id]
   end
-  # rubocop: enable CodeReuse/ActiveRecord
 
   def build_from_ref
     return unless @ref_name

app/controllers/projects/build_artifacts_controller.rb

@@ -44,11 +44,9 @@ class Projects::BuildArtifactsController < Projects::ApplicationController
     @job ||= job_from_id || job_from_ref
   end
 
-  # rubocop: disable CodeReuse/ActiveRecord
   def job_from_id
-    project.builds.find_by(id: params[:build_id]) if params[:build_id]
+    project.get_build(params[:build_id]) if params[:build_id]
   end
-  # rubocop: enable CodeReuse/ActiveRecord
 
   def job_from_ref
     return unless @ref_name

app/models/project.rb

@@ -652,7 +652,11 @@ class Project < ActiveRecord::Base
   end
 
   def latest_successful_build_for!(job_name, ref = default_branch)
-    latest_successful_build_for(job_name, ref) or raise ActiveRecord::RecordNotFound.new("Couldn't find job #{job_name}", job_name)
+    latest_successful_build_for(job_name, ref) || raise(ActiveRecord::RecordNotFound.new("Couldn't find job #{job_name}"))
+  end
+
+  def get_build(id)
+    builds.find_by(id: id)
   end
 
   def merge_base_commit(first_commit_id, second_commit_id)

spec/models/project_spec.rb

@@ -2000,6 +2000,29 @@ describe Project do
     end
   end
 
+  describe '#get_build' do
+    let(:project) { create(:project, :repository) }
+    let(:ci_pipeline) { create(:ci_pipeline, project: project) }
+
+    context 'when build exists' do
+      context 'build is associated with project' do
+        let(:build) { create(:ci_build, :success, pipeline: ci_pipeline) }
+
+        it { expect(project.get_build(build.id)).to eq(build) }
+      end
+
+      context 'build is not associated with project' do
+        let(:build) { create(:ci_build, :success) }
+
+        it { expect(project.get_build(build.id)).to be_nil }
+      end
+    end
+
+    context 'build does not exists' do
+      it { expect(project.get_build(rand 100)).to be_nil }
+    end
+  end
+
   describe '#import_status' do
     context 'with import_state' do
       it 'returns the right status' do