How to add a gantt view for a model?

In this documentation we are adding the gantt view for project_task model.

• Step 1: Install the apps 'custom_gantt_view' and 'Project'.
• Step 2: Navigate to the Settings module and activate the developer mode.
  
• Step 3: Navigate to the Project module and open 'All Task' view.
  
• Step 4: Click on the marked button as shown in the below image and then click 'Edit Action' menu.
  
• Step 5: Then scroll down and click on the Add a line button
  
• Step 6: A wizard will be opened and add 'Gantt' inside the field 'View type' then in the field 'View' define a name for your view. Here I have named the view as 'project_task_gantt_view', then click on the create and edit button as shown in the below image.
  
• Step 7: A wizard will be opened and add 'Gantt' inside the field 'View type' then 'Task' in the field 'Model of the view'. Then in the Architecture section add the below code as show in below image. Then save and close, again save and close.

  <gantt string="Project Tasks" date_start="date_assign" date_end="date_deadline" group_by="project_id"> 
  <field name="id"/>
  </gantt>

  Note that 'date_assign' and 'date_deadline' are the fields used for the gantt view's start and end date. These fields are mandatory filed. If you have start date and end date fields in another name you need to change the code like date_start="Start date field" date_end="End date field".

  
• Step 8: Add gantt in the field 'View mode' as shown in the below image.
  
• Step 9: Save the form and click on 'All Tasks' menu, and click on the Gantt icon as shown in the below image.
  
• Step 10: Test the view.