Klaus V2.0

app/assets/stylesheets/application.css

@@ -15,3 +15,11 @@
  *= require rails_bootstrap_forms
  *= require_self
  */
+
+.navbar {
+  margin-bottom: 0px;
+}
+.page-header{
+  margin-top: 0px;
+  padding-top: 0px;
+}

app/controllers/doc_types_controller.rb

@@ -0,0 +1,47 @@
+class DocTypesController < ApplicationController
+  before_filter :authenticate_user!, :only => [:destroy, :edit, :update ]
+
+  def index
+    @doc_types_grid = initialize_grid(DocType)
+  end
+
+  def new
+    @doc_type = DocType.new
+  end
+
+  def create
+    @doc_type = DocType.new(doc_type_param)
+
+    if @doc_type.save
+      redirect_to documents_path, notice: 'DocType was successfully created.'
+    else
+      flash.now[:alert] = 'DocType creation failed.'
+      render 'new'
+    end
+  end
+
+  def edit
+    @doc_type = DocType.find(params[:id])
+  end
+
+  def update
+    @doc_type = DocType.find(params[:id])
+    if @doc_type.update(doc_type_param)
+      redirect_to doc_types_path, notice: 'DocType was successfully updated.'
+    else
+      flash.now[:alert] = 'DocType update failed.'
+      render 'new'
+    end
+  end
+
+  def destroy
+    @doc_type = DocType.find(params[:id])
+    @doc_type.destroy
+
+    redirect_to doc_types_path, notice: 'DocType was successfully destroyed.'
+  end
+private
+  def doc_type_param
+    params.require(:doc_type).permit(:name)
+  end
+end

app/controllers/documents_controller.rb

@@ -1,6 +1,8 @@
 class DocumentsController < ApplicationController
+  before_filter :authenticate_user!, :only => [:destroy, :edit, :update ]
+
   def index
-    @documents_grid = initialize_grid(Document)
+    @documents_grid = initialize_grid(Document, include: [:lesson, :doc_type, :semester, :professor])
   end
 
   def new
@@ -13,13 +15,39 @@ class DocumentsController < ApplicationController
     if @document.save
       redirect_to documents_path, notice: 'Document was successfully created.'
     else
-      lash.now[:alert] = 'Document creation failed.'
+      flash.now[:alert] = 'Document creation failed.'
       render 'new'
     end
   end
 
+  def edit
+    @document = Document.find(params[:id])
+  end
+
+  def update
+    @document = Document.find(params[:id])
+
+    if @document.update(document_update_params)
+      redirect_to documents_path, notice: 'Document was successfully updated.'
+    else
+      flash.now[:alert] = 'Document update failed.'
+      render 'new'
+    end
+  end
+
+  def destroy
+    @document = Document.find(params[:id])
+    @document.destroy
+
+    redirect_to documents_path, notice: 'Document was successfully destroyed.'
+  end
+
 private
   def document_params
-    params.require(:document).permit(:name)
+    params.require(:document).permit(:doc_type_id, :semester_id, :professor_id, :file, :file_cache, :lesson_id)
+  end
+
+  def document_update_params
+    params.require(:document).permit(:doc_type_id, :semester_id, :professor_id, :lesson_id)
   end
 end

app/controllers/lessons_controller.rb

@@ -0,0 +1,47 @@
+class LessonsController < ApplicationController
+  before_filter :authenticate_user!, :only => [:destroy, :edit, :update ]
+
+  def index
+    @lessons_grid = initialize_grid(Lesson)
+  end
+
+  def new
+    @lesson = Lesson.new
+  end
+
+  def create
+    @lesson = Lesson.new(lesson_params)
+
+    if @lesson.save
+      redirect_to documents_path, notice: 'Lesson was successfully created.'
+    else
+      flash.now[:alert] = 'Lesson creation failed.'
+      render 'new'
+    end
+  end
+
+  def edit
+    @lesson = Lesson.find(params[:id])
+  end
+
+  def update
+    @lesson = Lesson.find(params[:id])
+    if @lesson.update(lesson_params)
+      redirect_to lessons_path, notice: 'Lesson was successfully updated.'
+    else
+      flash.now[:alert] = 'Lesson update failed.'
+      render 'new'
+    end
+  end
+
+  def destroy
+    @lesson = Lesson.find(params[:id])
+    @lesson.destroy
+
+    redirect_to lessons_path, notice: 'Lesson was successfully destroyed.'
+  end
+private
+  def lesson_params
+    params.require(:lesson).permit(:name, :short_name)
+  end
+end

app/controllers/professors_controller.rb

@@ -0,0 +1,46 @@
+class ProfessorsController < ApplicationController
+  before_filter :authenticate_user!, :only => [:destroy, :edit, :update ]
+
+  def index
+    @professors_grid = initialize_grid(Professor)
+  end
+
+  def new
+    @professor = Professor.new
+  end
+
+  def create
+    @professor = Professor.new(professor_params)
+
+    if @professor.save
+      redirect_to documents_path, notice: 'Professor was successfully created.'
+    else
+      flash.now[:alert] = 'Professor creation failed.'
+      render 'new'
+    end
+  end
+  def edit
+    @professor = Professor.find(params[:id])
+  end
+
+  def update
+    @professor = Professor.find(params[:id])
+    if @professor.update(professor_params)
+      redirect_to professors_path, notice: 'Professor was successfully updated.'
+    else
+      flash.now[:alert] = 'Professor update failed.'
+      render 'new'
+    end
+  end
+
+  def destroy
+    @professor = Professor.find(params[:id])
+    @professor.destroy
+
+    redirect_to professors_path, notice: 'Professor was successfully destroyed.'
+  end
+private
+  def professor_params
+    params.require(:professor).permit(:first_name, :last_name)
+  end
+end

app/controllers/semesters_controller.rb

@@ -0,0 +1,47 @@
+class SemestersController < ApplicationController
+  before_filter :authenticate_user!, :only => [:destroy, :edit, :update ]
+
+  def index
+    @semesters_grid = initialize_grid(Semester)
+  end
+
+  def new
+    @semester = Semester.new
+  end
+
+  def create
+    @semester = Semester.new(semester_params)
+
+    if @semester.save
+      redirect_to documents_path, notice: 'Semester was successfully created.'
+    else
+      flash.now[:alert] = 'Semester creation failed.'
+      render 'new'
+    end
+  end
+
+  def edit
+    @semester = Semester.find(params[:id])
+  end
+
+  def update
+    @semester = Semester.find(params[:id])
+    if @semester.update(semester_params)
+      redirect_to semesters_path, notice: 'Semester was successfully updated.'
+    else
+      flash.now[:alert] = 'Semester update failed.'
+      render 'new'
+    end
+  end
+
+  def destroy
+    @semester = Semester.find(params[:id])
+    @semester.destroy
+
+    redirect_to semesters_path, notice: 'Semester was successfully destroyed.'
+  end
+private
+  def semester_params
+    params.require(:semester).permit(:name)
+  end
+end

app/models/concerns/to_dropdown.rb

@@ -0,0 +1,13 @@
+module ToDropdown
+  extend ActiveSupport::Concern
+
+  def to_option
+    [name, id]
+  end
+
+  module ClassMethods
+    def to_dropdown
+      all.order(:name).map(&:to_option)
+    end
+  end
+end

app/models/doc_type.rb

@@ -0,0 +1,10 @@
+class DocType < ActiveRecord::Base
+  include ToDropdown
+  has_many :documents
+
+  auto_strip_attributes :name, squish: true
+  auto_strip_attributes :name, nullify: true
+
+  validates :name, presence: true
+  validates :name, uniqueness: true
+end

app/models/document.rb

@@ -1,3 +1,23 @@
 class Document < ActiveRecord::Base
-  validates :name, presence: true
+  belongs_to :doc_type
+  belongs_to :professor
+  belongs_to :semester
+  belongs_to :lesson
+
+  mount_uploader :file, DocumentUploader
+
+  validates :doc_type_id, presence: true
+  validates :professor_id, presence: true
+  validates :semester_id, presence: true
+  validates :lesson_id, presence: true
+  validates_presence_of :file
+  validates_integrity_of :file
+  validates_processing_of :file
+
+  before_validation :set_position
+
+private
+  def set_position
+    self.position = (Document.where(doc_type: self.doc_type, professor: self.professor, semester: self.semester, lesson: self.lesson).maximum(:position) || 0) + 1
+  end
 end

app/models/lesson.rb

@@ -0,0 +1,13 @@
+class Lesson < ActiveRecord::Base
+  include ToDropdown
+  has_many :documents
+
+  auto_strip_attributes :name, squish: true
+  auto_strip_attributes :name, nullify: true
+
+  auto_strip_attributes :short_name, squish: true
+  auto_strip_attributes :short_name, nullify: true
+
+  validates :name, presence: true
+  validates :name, uniqueness: true
+end

app/models/professor.rb

@@ -0,0 +1,28 @@
+class Professor < ActiveRecord::Base
+  include ToDropdown
+  has_many :documents
+
+  auto_strip_attributes :first_name, squish: true
+  auto_strip_attributes :first_name, nullify: true
+  auto_strip_attributes :last_name, squish: true
+  auto_strip_attributes :last_name, nullify: true
+
+  validates :first_name, presence: true
+  validates :last_name, presence: true
+
+  def name_last_first
+    "#{self.last_name}, #{self.first_name}"
+  end
+
+  def name_first_name
+    "#{self.first_name} #{self.last_name}"
+  end
+
+  def to_option
+    [name_last_first, id]
+  end
+
+  def self.to_dropdown
+    all.order(:last_name, :first_name).map(&:to_option)
+  end
+end

app/models/semester.rb

@@ -0,0 +1,10 @@
+class Semester < ActiveRecord::Base
+  include ToDropdown
+  has_many :documents
+
+  auto_strip_attributes :name, squish: true
+  auto_strip_attributes :name, nullify: true
+
+  validates :name, presence: true
+  validates :name, uniqueness: true
+end

app/models/user.rb

@@ -0,0 +1,5 @@
+class User < ActiveRecord::Base
+  # Include default devise modules. Others available are:
+  # :confirmable, :lockable, :timeoutable and :omniauthable
+  devise :database_authenticatable,  :trackable, :validatable
+end

app/uploaders/document_uploader.rb

@@ -0,0 +1,51 @@
+# encoding: utf-8
+
+class DocumentUploader < CarrierWave::Uploader::Base
+
+  # Include RMagick or MiniMagick support:
+  # include CarrierWave::RMagick
+  # include CarrierWave::MiniMagick
+
+  # Choose what kind of storage to use for this uploader:
+  storage :file
+  # storage :fog
+
+  # Override the directory where uploaded files will be stored.
+  # This is a sensible default for uploaders that are meant to be mounted:
+  def store_dir
+    "uploads/document"
+  end
+
+  # Provide a default URL as a default if there hasn't been a file uploaded:
+  # def default_url
+  #   # For Rails 3.1+ asset pipeline compatibility:
+  #   # ActionController::Base.helpers.asset_path("fallback/" + [version_name, "default.png"].compact.join('_'))
+  #
+  #   "/images/fallback/" + [version_name, "default.png"].compact.join('_')
+  # end
+
+  # Process files as they are uploaded:
+  # process :scale => [200, 300]
+  #
+  # def scale(width, height)
+  #   # do something
+  # end
+
+  # Create different versions of your uploaded files:
+  # version :thumb do
+  #   process :resize_to_fit => [50, 50]
+  # end
+
+  # Add a white list of extensions which are allowed to be uploaded.
+  # For images you might use something like this:
+  # def extension_white_list
+  #   %w(jpg jpeg gif png)
+  # end
+
+  # Override the filename of the uploaded files:
+  # Avoid using model.id or version_name here, see uploader/store.rb for details.
+  def filename
+    return unless original_filename
+    "#{model.lesson.name}_#{model.professor.name_first_name}_#{model.semester.name}_#{model.position}.#{model.file.file.extension}".gsub(/[^a-zA-Z0-9ÄÖÜäöüß\.\-\+_]/, '')
+  end
+end

app/views/devise/sessions/new.html.slim

@@ -0,0 +1,9 @@
+h2 Sign in
+
+= bootstrap_form_for(resource, as: resource_name, url: session_path(resource_name)) do |f|
+  = f.email_field :email, autofocus: true
+  = f.password_field :password, autocomplete: "off"
+
+  - if devise_mapping.rememberable?
+    = f.check_box :remember_me
+  = f.submit

app/views/doc_types/_form.html.slim

@@ -0,0 +1,5 @@
+div.well
+  = bootstrap_form_for(@doc_type) do |f|
+    = f.text_field :name
+
+    = f.submit

app/views/doc_types/edit.html.slim

@@ -0,0 +1,4 @@
+- content_for :page_header
+  | Typ - #{@doc_type.name}
+
+= render 'form'

app/views/doc_types/index.html.erb

@@ -0,0 +1,18 @@
+<% content_for :page_header do %>
+Typ - Index
+<% end %>
+<%= grid(@doc_types_grid, upper_pagination_panel: true) do |g|
+    g.blank_slate content_tag(:div, "No records found", class: 'well')
+    g.column name: 'ID', attribute: 'id'
+    g.column name: 'Name', attribute: 'name'
+
+    g.column do |doc_type|
+      contant = content_tag(:div, class: 'btn-group') do
+        link = ''.html_safe
+        link.concat btn_link_to('Edit', edit_doc_type_path(doc_type), class: 'btn-xs btn-warning') if user_signed_in?
+        link.concat btn_link_to('Delete', doc_type_path(doc_type), method: "delete", :data => { confirm: 'Are you sure?' }, class: 'btn-xs btn-danger') if user_signed_in?
+        link
+      end
+    end
+  end
+ %>

app/views/doc_types/new.html.slim

@@ -0,0 +1,4 @@
+- content_for :page_header
+  | Neuer Typ
+
+= render 'form'

app/views/documents/_form.html.slim

@@ -1,4 +1,16 @@
-= bootstrap_form_for(@document) do |f|
-  = f.text_field :name
-
-  = f.submit
+div.well
+  = bootstrap_form_for(@document, html: {multipart: true}) do |f|
+    = f.collection_select :doc_type_id,  DocType.order(:name).all, :id, :name, prompt: true
+    = f.collection_select :semester_id,  Semester.order(name: :desc).all, :id, :name, prompt: true
+    = f.collection_select :lesson_id,    Lesson.order(:name).all, :id, :name, prompt: true
+    = f.collection_select :professor_id, Professor.order(:last_name).all, :id, :last_name, prompt: true
+    - if @document.new_record?
+      div.row
+        div.col-lg-6
+          = f.file_field :file
+        div.col-lg-6
+          - if @document.file_cache
+            = f.static_control label: 'Uploaded file'
+              = link_to @document.file.filename, @document.file_url
+          = f.hidden_field :file_cache, readonly: true
+    = f.submit

app/views/documents/_grid.html.erb

@@ -1,5 +1,33 @@
-<%= grid(@documents_grid, upper_pagination_panel: true) do |g|
-    g.column name: 'ID', attribute: 'id'
-    g.column name: 'Name', attribute: 'name'
+<%
+  define_grid(@documents_grid, upper_pagination_panel: true) do |g|
+    g.blank_slate content_tag(:div, "No records found", class: 'well')
+
+    g.column name: 'Position', attribute: 'position'
+
+    g.column name: 'Semester', attribute: 'id', detach_with_id: 'semester_filter', model: 'Semester', custom_filter: Semester.to_dropdown do |document|
+      document.semester.name if document.semester
+    end
+
+    g.column name: 'Typ', attribute: 'id', detach_with_id: 'doc_type_filter', model: 'DocType', html:{class: 'text-center'}, custom_filter: DocType.to_dropdown do |document|
+      document.doc_type.name if document.doc_type
+    end
+
+    g.column name: 'Fach', attribute: 'id', detach_with_id: 'lesson_filter', model: 'Lesson', custom_filter: Lesson.to_dropdown do |document|
+      document.lesson.name if document.lesson
+    end
+
+    g.column name: 'Professor', attribute: 'id', detach_with_id: 'professor_filter', model: 'Professor', custom_filter: Professor.to_dropdown do |document|
+      document.professor.name_last_first if document.professor
+    end
+
+    g.column html:{class: 'text-center'} do |document|
+      contant = content_tag(:div, class: 'btn-group') do
+        link = ''.html_safe
+        link.concat btn_link_to('Download', document.file_url, class: 'btn-xs btn-primary')
+        link.concat btn_link_to('Edit', edit_document_path(document), class: 'btn-xs btn-warning') if user_signed_in?
+        link.concat btn_link_to('Delete', document_path(document), method: "delete", :data => { confirm: 'Are you sure?' }, class: 'btn-xs btn-danger') if user_signed_in?
+        link
+      end
+    end
   end
-%>
+%>

app/views/documents/edit.html.slim

@@ -0,0 +1,4 @@
+- content_for :page_header
+  | Dokument - #{@document.semester.name} / #{@document.professor.name} / #{@document.lesson.name} / #{@document.doc_type.name}
+
+= render 'form'

app/views/documents/index.html.slim

@@ -1,6 +1,40 @@
-h1 Index
+- content_for :page_header
+  | Dokumente - Index
+- render 'grid'
 
-p
-  = btn_link_to 'New', new_document_path, class: 'btn-primary'
-
-= render 'grid'
+div.col-lg-2.col-md-2.text-center
+  = image_tag 'QR-FS-Logo_-_fsmni.thm.de.png'
+div.col-lg-10.col-md-10
+  div.panel.panel-default
+    div.panel-heading
+      h3.panel-title
+        |  Filter
+    div
+      div.panel-body
+        div.form-horizontal
+          div.col-lg-6.col-md-11
+            div.form-group
+              label for="last_name_filter" class="col-sm-2 control-label" Professor
+              div class="col-sm-10"
+                = grid_filter @documents_grid, :professor_filter
+            div class="form-group"
+              label for="first_name_filter" class="col-sm-2 control-label" Fach
+              div class="col-sm-10"
+                = grid_filter @documents_grid, :lesson_filter
+          div class="col-lg-5 col-md-11"
+            div class="form-group"
+              label for="middle_name_filter" class="col-sm-2 control-label" Semester
+              div class="col-sm-10"
+                = grid_filter @documents_grid, :semester_filter
+            div class="form-group"
+              label for="id_filter" class="col-sm-2 control-label" Type
+              div class="col-sm-10"
+                = grid_filter @documents_grid, :doc_type_filter
+          div class="col-lg-1 col-md-1"
+            div class="form-group"
+              button class="btn btn-primary wg-external-submit-button" data-grid-name='grid' Submit
+          div class="col-lg-1 col-md-1"
+            div class="form-group"
+              button class="btn btn-default wg-external-reset-button" data-grid-name='grid' Reset
+div.col-lg-12.col-md-12
+  == render_grid(@documents_grid)

app/views/documents/new.html.slim

@@ -1 +1,3 @@
+- content_for :page_header
+  | Neues Dokument
 == render 'form'

app/views/layouts/application.html.slim

@@ -10,14 +10,23 @@ html
     nav.navbar.navbar-default role="navigation"
       div.container-fluid
         div.navbar-header
-          button.navbar-toggle type="button" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1"
+          button.navbar-toggle type="button" data-toggle="collapse" data-target="#navbar"
             spansr-only Toggle navigation
             spanicon-bar
             spanicon-bar
             spanicon-bar
           = link_to 'Klaus', root_path, class: 'navbar-brand'
-        div.collapse.navbar-collapse#bs-example-navbar-collapse-1
+        div.collapse.navbar-collapse#navbar
+          ul.nav.navbar-nav
+            li = link_to 'Übersicht', documents_path
+            li = link_to 'Neues Dokument', new_document_path
+            li = link_to 'Neuer Dokument Typ', new_doc_type_path
+            li = link_to 'Neuer Professor', new_professor_path
+            li = link_to 'Neues Semester', new_semester_path
+            li = link_to 'Neues Fach', new_lesson_path
     div.container
+      div.page-header
+        h1 = content_for :page_header
       - if notice
         div.alert.alert-success.alert-dismissable
           button type="button" class="close" data-dismiss="alert" aria-hidden="true"
@@ -28,4 +37,14 @@ html
           button type="button" class="close" data-dismiss="alert" aria-hidden="true"
             | ×
           = alert
-      = yield
+      = yield
+      footer.text-center
+        p
+          | CC BY-NC-SA - Fachschaft MNI - Technische Hochschule Mittelhessen
+          br
+          == "Index: #{link_to 'Type', doc_types_path} | #{link_to 'Fach', lessons_path} | #{link_to 'Professor', professors_path} | #{link_to 'Semester', semesters_path}"
+          br
+          - if user_signed_in?
+            = link_to 'Logout', destroy_user_session_path, method: :delete
+          - else
+           = link_to 'Login', new_user_session_path

app/views/lessons/_form.html.slim

@@ -0,0 +1,6 @@
+div.well
+  = bootstrap_form_for(@lesson) do |f|
+    = f.text_field :name
+    = f.text_field :short_name
+
+    = f.submit

app/views/lessons/edit.html.slim

@@ -0,0 +1,4 @@
+- content_for :page_header
+  | Fach - #{@lesson.name}
+
+= render 'form'

app/views/lessons/index.html.erb

@@ -0,0 +1,19 @@
+<% content_for :page_header do %>
+Fach - Index
+<% end %>
+<%= grid(@lessons_grid, upper_pagination_panel: true) do |g|
+    g.blank_slate content_tag(:div, "No records found", class: 'well')
+    g.column name: 'ID', attribute: 'id'
+    g.column name: 'Name', attribute: 'short_name'
+    g.column name: 'Name', attribute: 'name'
+
+    g.column do |lesson|
+      contant = content_tag(:div, class: 'btn-group') do
+        link = ''.html_safe
+        link.concat btn_link_to('Edit', edit_lesson_path(lesson), class: 'btn-xs btn-warning') if user_signed_in?
+        link.concat btn_link_to('Delete', lesson_path(lesson), method: "delete", :data => { confirm: 'Are you sure?' }, class: 'btn-xs btn-danger') if user_signed_in?
+        link
+      end
+    end
+  end
+%>

app/views/lessons/new.html.slim

@@ -0,0 +1,4 @@
+- content_for :page_header
+  | Neues Fach
+
+= render 'form'

app/views/professors/_form.html.slim

@@ -0,0 +1,6 @@
+div.well
+  = bootstrap_form_for(@professor) do |f|
+    = f.text_field :first_name
+    = f.text_field :last_name
+
+    = f.submit

app/views/professors/edit.html.slim

@@ -0,0 +1,4 @@
+- content_for :page_header
+  | Professor - #{@professor.name}
+
+= render 'form'

app/views/professors/index.html.erb

@@ -0,0 +1,19 @@
+<% content_for :page_header do %>
+Professor - Index
+<% end %>
+<%= grid(@professors_grid, upper_pagination_panel: true) do |g|
+    g.blank_slate content_tag(:div, "No records found", class: 'well')
+    g.column name: 'ID', attribute: 'id'
+    g.column name: 'First Name', attribute: 'first_name'
+    g.column name: 'Last Name', attribute: 'last_name'
+
+    g.column do |professor|
+      contant = content_tag(:div, class: 'btn-group') do
+        link = ''.html_safe
+        link.concat btn_link_to('Edit', edit_professor_path(professor), class: 'btn-xs btn-warning') if user_signed_in?
+        link.concat btn_link_to('Delete', professor_path(professor), method: "delete", :data => { confirm: 'Are you sure?' }, class: 'btn-xs btn-danger') if user_signed_in?
+        link
+      end
+    end
+  end
+ %>

app/views/professors/new.html.slim

@@ -0,0 +1,4 @@
+- content_for :page_header
+  | Neuer Professor
+
+= render 'form'

app/views/semesters/_form.html.slim

@@ -0,0 +1,5 @@
+div.well
+  = bootstrap_form_for(@semester) do |f|
+    = f.text_field :name
+
+    = f.submit

app/views/semesters/edit.html.slim

@@ -0,0 +1,4 @@
+- content_for :page_header
+  | Semester - #{@semester.name}
+
+= render 'form'

app/views/semesters/index.html.erb

@@ -0,0 +1,18 @@
+<% content_for :page_header do %>
+Semester - Index
+<% end %>
+<%= grid(@semesters_grid, upper_pagination_panel: true) do |g|
+    g.blank_slate content_tag(:div, "No records found", class: 'well')
+    g.column name: 'ID', attribute: 'id'
+    g.column name: 'Name', attribute: 'name'
+
+    g.column do |semester|
+      contant = content_tag(:div, class: 'btn-group') do
+        link = ''.html_safe
+        link.concat btn_link_to('Edit', edit_semester_path(semester), class: 'btn-xs btn-warning') if user_signed_in?
+        link.concat btn_link_to('Delete', semester_path(semester), method: "delete", :data => { confirm: 'Are you sure?' }, class: 'btn-xs btn-danger') if user_signed_in?
+        link
+      end
+    end
+  end
+ %>

app/views/semesters/new.html.slim

@@ -0,0 +1,4 @@
+- content_for :page_header
+  | Neues Semester
+
+= render 'form'