Model Class Diagram - M0 Activity

Goals:

• Each member of your team will learn to create model class diagrams using GenMyModel.
• Your team will work together to create a model design diagram for the team’s app.

Step 1: Learn to use GenMyModel to create a class diagrams

Individual Step: Each team member should do this step individually on their own computer.

Step 1.1: Start a class diagram

🎦 Watch: How to start a UML class diagram in GenMyModel.

• GenMyModel: https://app.genmymodel.com/

Step 1.2: Make a class

🎦 Watch: How to make a class in GenMyModel.

Goal and Steps:

• Create a class User to capture user login info.
  • string attribute email.
  • string attribute encrypted_password.

Step 1.3: Make a one-to-many association

🎦 Watch: How to make a one-to-many association in GenMyModel.

Goal and Steps:

• Create a class BlogPost to capture blog posts created by users.
  • string attribute title.
  • text attribute body.
• Create a one-to-many association between User and BlogPost to capture users’ authorship of blog posts.
  • Each user authors zero or more blog posts.
  • Each blog post is authored by exactly one user.
  • has► association label.
  • * multiplicity with post label on BlogPost side.
  • 1 multiplicity with author label on User side.

Step 1.4: Make a many-to-many association

🎦 Watch: How to make a many-to-many association in GenMyModel.

Goal and Steps:

• Create a many-to-many association between User and BlogPost to capture users’ favorite blog posts.
  • Each user has zero or more favorite blog posts.
  • Each blog post is a favorite of zero or more users.
  • Favorite association class.
  • * multiplicity with user label on User side.
  • * multiplicity with post label on BlogPost side.

Step 1.5: Export diagram as an image

🎦 Watch: How to export a diagram as a PNG image in GenMyModel.

Step 2: Design the model for your app

Team Step: All team members should work together to complete this step.

🎦 Watch: Introduction to data modeling.

• One Diagram per Team. For this part, a single GenMyModel diagram must be shared by the team.
• Everyone Contributes. All team members should work together to develop the model design for the team’s app.
• Noun-Phrase Identification. Document a list of all the noun phrases your team identifies to inspire your class diagram. Be prepared to submit this list along with your class diagram.
• Follow Diagram Conventions. In creating your class diagrams, all of the diagram conventions mentioned above must be followed.
• No ERDs! Only object-oriented class diagrams are acceptable—no entity-relationship diagrams (ERDs) allowed!