Merge pull request #35 from LaunchCodeEducation/chapter18

Chapter 18: Relationships and ORM

content/orm-relationships/_index.md

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+---
+title: "Chapter 18: Relationships in Object-Relational Mapping"
+date: 2023-08-21T14:38:32-05:00
+draft: false
+weight: 18
+originalAuthor: Sally Steuterman # to be set by page creator
+originalAuthorGitHub: gildedgardenia # to be set by page creator
+reviewer: # to be set by the page reviewer
+reviewerGitHub: # to be set by the page reviewer
+lastEditor: # update any time edits are made after review
+lastEditorGitHub: # update any time edits are made after review
+lastMod: # UPDATE ANY TIME CHANGES ARE MADE
+---
+
+## Learning Objectives
+
+Upon completing the content in this chapter, you should be able to do the following:
+
+1. Build persistent model classes that have one-to-many, many-to-one, one-to-one, and many-to-many relationships
+1. Understand how these relationships are represented in a relational database
+
+## Key Terminology
+
+As you read though this chapter, make note of the following key terms and their definitions.
+
+### Types of Relationships
+
+1. one-to-one relationship
+1. one-to-many relationship
+1. many-to-one relationship
+1. many-to-many relationship
+
+### Creating a Many-to-One Relationship
+
+1. truncate
+
+### Creating a One-to-One Relationship
+
+1. transient
+1. cascades
+
+### Creating a Many-to-Many Relationship 
+
+1. data transfer object
+1. DTO
+1. join table
+
+## Chapter Content
+
+{{% children %}}

content/orm-relationships/exercises/_index.md

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+---
+title: "Exercises: The Early Bird Gets the ORM!"
+date: 2023-08-21T14:38:32-05:00
+draft: false
+weight: 2
+originalAuthor: Sally Steuterman  # to be set by page creator
+originalAuthorGitHub: gildedgardenia # to be set by page creator
+reviewer: # to be set by the page reviewer
+reviewerGitHub: # to be set by the page reviewer
+lastEditor: # update any time edits are made after review
+lastEditorGitHub: # update any time edits are made after review
+lastMod: # UPDATE ANY TIME CHANGES ARE MADE
+---
+
+Now that we have gotten very familiar with our `coding-events` application, let's design some additional features.
+As you work on your `coding-events` application, you may have been inspired by [Meetup](https://www.meetup.com/)!
+One of the cool features that Meetup has is that people can sign up for accounts.
+They can use their Meetup accounts to follow the events they are most interested in and keep track of their calendar of events.
+To add similar features to `coding-events`, you need to add a `Person` class.
+For the exercises, answer the following questions about what your `Person` class would look like.
+
+{{% notice blue "Note" "rocket" %}}
+   You do not have to code anything to complete these exercises!
+   This is mainly focused on using our design skills to add a new feature to your application.
+{{% /notice %}}
+
+1. You need to add a `Person` class to hold necessary info about users of our app. What fields and methods would this class hold?
+1. Would you need to add any additional classes to `Person` to make the app work? If so, what classes would be necessary?
+1. What kinds of relationships would `Person` have to the other classes you already created, such as the `Event` class?
+
+As you dream up answers to these questions, write the answers down in a note or piece of paper. You are now going to write up some documentation for your app!
+
+1. Add a `README.md` to your repository by navigating to the repository page on your GitHub profile.
+   At the bottom of the page, there is a blue banner asking you to add a `README.md`. Click the button to do so!
+1. You should write three sections. The first should describe the purpose of the app. The second should describe the current state of the app.
+   The third and final section should describe the future improvements you want to make to the app including your notes about the `Person` class.
+
+{{% expand "Check your solution" %}}
+
+Here is an example of how the README may turn out:
+
+1. Our `Person` class might hold the following fields:
+
+   1. `id` (`int`) - the unique user ID
+   1. `firstName` (`String`) - the user’s first name
+   1. `lastName` (`String`) - the user’s last name
+   1. `email` (`String`) - the user’s email, which will also function as their username
+   1. `password` (`String`) - the user’s password
+
+   The class would need getters for all of these fields. It could have setters for all fields except id (since it shouldn’t change).
+
+1. The Person class might also have the following references:
+
+   1. `PersonProfile` - a class to gather up all of the profile information about the user
+   1. `List<Events> eventsAttending` - to store events the user wants to attend
+   1. `List<Events> eventsOwned` - a different list, to store the events the user has created
+
+`Person` would have a many-to-many relationship with `Event` via `List<Events> eventsAttending`. It would have a one-to-many relationship with `Event` via `List<Events> eventsOwned`.
+
+{{% /expand %}}

content/orm-relationships/next-steps.md

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+---
+title: "Next Steps"
+date: 2023-08-21T14:38:32-05:00
+draft: false
+weight: 3
+originalAuthor: Sally Steuterman # to be set by page creator
+originalAuthorGitHub: gildedgardenia # to be set by page creator
+reviewer: # to be set by the page reviewer
+reviewerGitHub: # to be set by the page reviewer
+lastEditor: # update any time edits are made after review
+lastEditorGitHub: # update any time edits are made after review
+lastMod: # UPDATE ANY TIME CHANGES ARE MADE
+---
+
+After completing this chapter, you are ready to tackle authentication. If you would like to learn more about Spring and ORM, here are a few resources.
+
+1. [Spring ORM Example Using Hibernate](https://www.geeksforgeeks.org/spring-orm-example-using-hibernate/)
+1. [Spring Documentation](https://docs.spring.io/spring-framework/docs/2.0.x/reference/orm.html)

content/orm-relationships/reading/_index.md

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+---
+title: "Reading"
+date: 2023-08-21T14:38:32-05:00
+draft: false
+weight: 1
+originalAuthor: Sally Steuterman # to be set by page creator
+originalAuthorGitHub: gildedgardenia # to be set by page creator
+reviewer: # to be set by the page reviewer
+reviewerGitHub: # to be set by the page reviewer
+lastEditor: # update any time edits are made after review
+lastEditorGitHub: # update any time edits are made after review
+lastMod: # UPDATE ANY TIME CHANGES ARE MADE
+---
+
+## Reading Content Links
+
+{{% children %}}