“One-to-Many This relation involves a table pointing to several or many tables.”: I think “One-to-Many” means a table pointing to many recored in another table, not “…to several or many tables”. Refer: One-to-many (data model) - Wikipedia
“The Comment model and the Answer model have a one-to-one relationship. A comment has one answer.”: The relation between Comment and Answer should be One-Way relationship, because of there is no point back to the “pointing” column in answer model. Look the source files:
comment.settings.json
...
"attributes": {
"cText": {
"type": "text"
},
"answer": {
"model": "answer"
},
"user": {
"type": "string"
}
}
...
answer.settings.json
...
"attributes": {
"aText": {
"type": "text"
},
"user": {
"type": "string"
},
"question": {
"via": "answers",
"model": "question"
}
}
...