Module Update

src/shared/db/relations.ts

@@ -0,0 +1,171 @@
+import { relations } from "drizzle-orm";
+import { 
+  users, 
+  accounts,
+  sessions,
+  roles, 
+  usersToRoles, 
+  questions, 
+  knowledgePoints, 
+  questionsToKnowledgePoints, 
+  textbooks, 
+  chapters, 
+  exams, 
+  examQuestions, 
+  examSubmissions, 
+  submissionAnswers 
+} from "./schema";
+
+// --- Users & Roles Relations ---
+
+export const usersRelations = relations(users, ({ many }) => ({
+  accounts: many(accounts),
+  sessions: many(sessions),
+  usersToRoles: many(usersToRoles),
+  createdExams: many(exams),
+  submissions: many(examSubmissions),
+  authoredQuestions: many(questions),
+}));
+
+export const accountsRelations = relations(accounts, ({ one }) => ({
+  user: one(users, {
+    fields: [accounts.userId],
+    references: [users.id],
+  }),
+}));
+
+export const sessionsRelations = relations(sessions, ({ one }) => ({
+  user: one(users, {
+    fields: [sessions.userId],
+    references: [users.id],
+  }),
+}));
+
+export const rolesRelations = relations(roles, ({ many }) => ({
+  usersToRoles: many(usersToRoles),
+}));
+
+export const usersToRolesRelations = relations(usersToRoles, ({ one }) => ({
+  user: one(users, {
+    fields: [usersToRoles.userId],
+    references: [users.id],
+  }),
+  role: one(roles, {
+    fields: [usersToRoles.roleId],
+    references: [roles.id],
+  }),
+}));
+
+// --- Questions Relations (Self-Reference & KP) ---
+
+export const questionsRelations = relations(questions, ({ one, many }) => ({
+  author: one(users, {
+    fields: [questions.authorId],
+    references: [users.id],
+  }),
+  // Self-Reference: Parent Question
+  parent: one(questions, {
+    fields: [questions.parentId],
+    references: [questions.id],
+    relationName: "question_hierarchy",
+  }),
+  // Self-Reference: Child Questions
+  children: many(questions, {
+    relationName: "question_hierarchy",
+  }),
+  
+  // Many-to-Many with Knowledge Points
+  questionsToKnowledgePoints: many(questionsToKnowledgePoints),
+  
+  // Usage in Exams
+  examQuestions: many(examQuestions),
+}));
+
+export const knowledgePointsRelations = relations(knowledgePoints, ({ one, many }) => ({
+  // Tree Structure
+  parent: one(knowledgePoints, {
+    fields: [knowledgePoints.parentId],
+    references: [knowledgePoints.id],
+    relationName: "kp_hierarchy",
+  }),
+  children: many(knowledgePoints, {
+    relationName: "kp_hierarchy",
+  }),
+  
+  questionsToKnowledgePoints: many(questionsToKnowledgePoints),
+}));
+
+export const questionsToKnowledgePointsRelations = relations(questionsToKnowledgePoints, ({ one }) => ({
+  question: one(questions, {
+    fields: [questionsToKnowledgePoints.questionId],
+    references: [questions.id],
+  }),
+  knowledgePoint: one(knowledgePoints, {
+    fields: [questionsToKnowledgePoints.knowledgePointId],
+    references: [knowledgePoints.id],
+  }),
+}));
+
+// --- Academic Relations ---
+
+export const textbooksRelations = relations(textbooks, ({ many }) => ({
+  chapters: many(chapters),
+}));
+
+export const chaptersRelations = relations(chapters, ({ one, many }) => ({
+  textbook: one(textbooks, {
+    fields: [chapters.textbookId],
+    references: [textbooks.id],
+  }),
+  parent: one(chapters, {
+    fields: [chapters.parentId],
+    references: [chapters.id],
+    relationName: "chapter_hierarchy",
+  }),
+  children: many(chapters, {
+    relationName: "chapter_hierarchy",
+  }),
+}));
+
+export const examsRelations = relations(exams, ({ one, many }) => ({
+  creator: one(users, {
+    fields: [exams.creatorId],
+    references: [users.id],
+  }),
+  questions: many(examQuestions),
+  submissions: many(examSubmissions),
+}));
+
+export const examQuestionsRelations = relations(examQuestions, ({ one }) => ({
+  exam: one(exams, {
+    fields: [examQuestions.examId],
+    references: [exams.id],
+  }),
+  question: one(questions, {
+    fields: [examQuestions.questionId],
+    references: [questions.id],
+  }),
+}));
+
+export const examSubmissionsRelations = relations(examSubmissions, ({ one, many }) => ({
+  exam: one(exams, {
+    fields: [examSubmissions.examId],
+    references: [exams.id],
+  }),
+  student: one(users, {
+    fields: [examSubmissions.studentId],
+    references: [users.id],
+  }),
+  answers: many(submissionAnswers),
+}));
+
+export const submissionAnswersRelations = relations(submissionAnswers, ({ one }) => ({
+  submission: one(examSubmissions, {
+    fields: [submissionAnswers.submissionId],
+    references: [examSubmissions.id],
+  }),
+  question: one(questions, {
+    fields: [submissionAnswers.questionId],
+    references: [questions.id],
+  }),
+}));