Make a many-to-many association

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Goal

• Add a many-to-many association such that
  • each User object has many BlogPost objects,
  • each BlogPost object has many User objects, and
  • the association has an association class, Favorite.

Steps

• Add Favorite class:
  • No attributes.
• Add the association declaration:
  • Add User - BlogPost to specify a new association between the User and BlogPost classes.
  • Add "user *" on the User side to specify a multiplicity of * and a role name of user.
  • Add "post *" on the BlogPost side to specify a multiplicity of * and a role name of post.
• Add the association class declaration:
  • Add (User, BlogPost) to specify that the association class will be on the preceding association between these classes.
  • Add .. Favorite on the end of the declaration to specify that the Favorite class will be the association class.

Reference Code

• Many-to-many association code:

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