Add Unit and Lesson Models to Rails App

In this module we will build out the remaining top-level models for our Rails application: the Unit and Lesson models.

A course will have many units and a unit will have many lessons.

The Lesson model will be the central model of the system supporting both videos and notes (rich text).

We'll create the models, wire them into the correct view and implement a rich text editor for editing Lesson notes.

Lessons

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Generate the Unit Model and Views for the Learn to Code Rails App
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Add Unit Views to the Admin Section of Learn to Code Rails App
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Connect Units Model to the Parent Course Model in Rails App
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Implement the Lesson Model in the Learn to Code Rails App
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Implement Trix Rich Text Editor in Lesson Form
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Use html_safe method to Display Rich Text in Lesson
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Implementing File Attachments with Active Storage in Rails 5.2
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Render Video Using HTML5 in Rails App
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Creating New Branch in Git for Lesson Work
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Store File Attachments in Amazon S3 in Learn to Code Rails App
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Configure DNS to Use Custom Domain Name with Godaddy and Heroku
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Create Migration in Rails to Improve Lesson Model
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Git Status, Add, Commit, Push, Branch, Checkout and Merge Commands
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Create a Reusable Footer in Rails App
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Create Privacy and Terms Views
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Debugging Production Rails Apps with Rollbar
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Add Image Attachment to Course Model
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Support for Delete Course and Unit Objects in Rails
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Course: Build an App from Scratch with Ruby On Rails