feat: SurveyAnswer Entity 생성 (#1)

classmate-backend-main/classmate/src/main/java/devteamOne/classmate/surveyAnswer/domain/SurveyAnswer.java

@@ -0,0 +1,31 @@
+package devteamOne.classmate.surveyAnswer.domain;
+
+import devteamOne.classmate.survey.domain.Survey;
+import devteamOne.classmate.surveyOption.domain.SurveyOption;
+import devteamOne.classmate.user.domain.User;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.Id;
+import jakarta.persistence.IdClass;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+
+@Entity
+@IdClass(SurveyAnswerId.class)
+public class SurveyAnswer {
+
+  @Id
+  @ManyToOne(fetch = FetchType.LAZY)
+  @JoinColumn(name = "user_id")
+  private User user;
+
+  @Id
+  @ManyToOne(fetch = FetchType.LAZY)
+  @JoinColumn(name = "survey_id")
+  private Survey survey;
+
+  @Id
+  @ManyToOne(fetch = FetchType.LAZY)
+  @JoinColumn(name = "survey_option_id")
+  private SurveyOption surveyOption;
+}

classmate-backend-main/classmate/src/main/java/devteamOne/classmate/surveyAnswer/domain/SurveyAnswerId.java

@@ -0,0 +1,12 @@
+package devteamOne.classmate.surveyAnswer.domain;
+
+import devteamOne.classmate.survey.domain.Survey;
+import devteamOne.classmate.surveyOption.domain.SurveyOption;
+import devteamOne.classmate.user.domain.User;
+import java.io.Serializable;
+
+public class SurveyAnswerId implements Serializable {
+  private User user;
+  private Survey survey;
+  private SurveyOption surveyOption;
+}