Javax.persistence / hibernate inside the game

Question

I am new to hibernate and java, I am trying to define a simple user-> groups-> permissions model in playframework, I want the delete caching rule to be enforced at the database level, and I don't want orm to take care of the cascade (which- something similar to python-sqlalchemy passive removal), here are my models:

User Model:

@Entity
@Table(name="auth_user")

public class User extends Model {

    @Column(name="username",nullable=false,length=40)
    @org.hibernate.annotations.Index(name = "idx_username")
    public String username;
    @Column(nullable=false,length=255)
    public String password;
    @Column(nullable=true,length=150)
    public String email;
    @Column(nullable=true,length=150)
    public String fullname;
    @Column(nullable=true)
    public boolean isAdmin;

    @OneToMany(mappedBy="group")
    public List<UserGroup> user_groups;
}

Group Model:

@Entity
@Table(name="auth_group")

public class Group extends Model {

    @Column(nullable=false,length=40)
    public String name;

    @OneToMany(mappedBy="group")
    public List<GroupPermission> group_permissions;

    @OneToMany(mappedBy="user")
    public List<UserGroup> user_groups;

Resolution Model:

@Entity
@Table(name="auth_permission")

public class Permission extends Model {

    @Column(nullable=false,length=40)
    public String name;
    @Column(nullable=false)
    public Integer code;

    @OneToMany(mappedBy="permission")
    public List<GroupPermission> permission_groups;

Group Model:

@Entity
@Table(name="group_permissions")

public class GroupPermission extends Model {

    @ManyToOne
    @org.hibernate.annotations.OnDelete(action=org.hibernate.annotations.OnDeleteAction.CASCADE)
    public Group group;

    @ManyToOne
    @org.hibernate.annotations.OnDelete(action=org.hibernate.annotations.OnDeleteAction.CASCADE)
    public  Permission permission;

UserGroup Model:

@Entity
@Table(name="user_groups")
public class UserGroup extends Model {

    @ManyToOne
    @org.hibernate.annotations.OnDelete(action=org.hibernate.annotations.OnDeleteAction.CASCADE)
    public User user;

    @ManyToOne
    @org.hibernate.annotations.OnDelete(action=org.hibernate.annotations.OnDeleteAction.CASCADE)
    public Group group;

this generates the following sql in postgres:

CREATE TABLE auth_user
(
id bigint NOT NULL,
email character varying(150),
fullname character varying(150),
isadmin boolean,
"password" character varying(255) NOT NULL,
username character varying(40) NOT NULL,
CONSTRAINT auth_user_pkey PRIMARY KEY (id)
)
WITH (
    OIDS=FALSE
);

ALTER TABLE auth_user OWNER TO postgres;
CREATE TABLE auth_group
(
id bigint NOT NULL,
"name" character varying(40) NOT NULL,
CONSTRAINT auth_group_pkey PRIMARY KEY (id)
)
WITH (
    OIDS=FALSE
);

ALTER TABLE auth_group OWNER TO postgres;

CREATE TABLE auth_permission
(id bigint NOT NULL,
 code integer NOT NULL,
 "name" character varying(40) NOT NULL,
 CONSTRAINT auth_permission_pkey PRIMARY KEY (id)
)
WITH (
    OIDS=FALSE
 );

ALTER TABLE auth_permission OWNER TO postgres;

CREATE TABLE group_permissions
(id bigint NOT NULL,
group_id bigint,
permission_id bigint,
CONSTRAINT group_permissions_pkey PRIMARY KEY (id),
CONSTRAINT fk8f9f82c43494357e FOREIGN KEY (permission_id)
    REFERENCES auth_permission (id) MATCH SIMPLE
    ON UPDATE NO ACTION ON DELETE NO ACTION,
CONSTRAINT fk8f9f82c4c8b3dcb6 FOREIGN KEY (group_id)
    REFERENCES auth_group (id) MATCH SIMPLE
    ON UPDATE NO ACTION ON DELETE NO ACTION
)
WITH (
  OIDS=FALSE
);

ALTER TABLE group_permissions OWNER TO postgres;

CREATE TABLE user_groups
(id bigint NOT NULL,
 group_id bigint,
 user_id bigint,
 CONSTRAINT user_groups_pkey PRIMARY KEY (id),
 CONSTRAINT fke27720c847140efe FOREIGN KEY (user_id)
    REFERENCES auth_user (id) MATCH SIMPLE
    ON UPDATE NO ACTION ON DELETE CASCADE,
 CONSTRAINT fke27720c86e0797ca FOREIGN KEY (group_id)
    REFERENCES auth_user (id) MATCH SIMPLE
    ON UPDATE NO ACTION ON DELETE NO ACTION,
 CONSTRAINT fke27720c8a1c053ea FOREIGN KEY (user_id)
    REFERENCES auth_group (id) MATCH SIMPLE
    ON UPDATE NO ACTION ON DELETE NO ACTION,
 CONSTRAINT fke27720c8c8b3dcb6 FOREIGN KEY (group_id)
    REFERENCES auth_group (id) MATCH SIMPLE
    ON UPDATE NO ACTION ON DELETE CASCADE
 )

 WITH (
    OIDS=FALSE
 );

 ALTER TABLE user_groups OWNER TO postgres; 

since you can see the index in the username field in the tabe auth_user is not created, the restriction in the user_groups table is duplicated equally, I have ON DELETE CASCADE ON and ON DELETE NO ACTION, I only need the cascade version, the cascade rule is not created in the group_permissions table,

what's wrong?

Answer 1

, tabe auth_user (...)

. , . @Table Hibernate. :

@Entity
@org.hibernate.annotations.Table(
    name="auth_user",
    indexes = { @Index(name="idx_username", columnNames = { "username" } ) }
    )
public class User { ... }

, , @org.hibernate.annotations.Index .

user_groups , ON DELETE CASCADE, ON DELETE NO ACTION, , group_permissions

, , . , Hibernate Jira. , . , .

Answer 2

, , .

, "jpa.ddl = create" ( ).

application.conf:

# JPA Configuration (Hibernate)
# ~~~~~
#
# Specify the custom JPA dialect to use here (default to guess):
# jpa.dialect=org.hibernate.dialect.PostgreSQLDialect
#
# Specify the ddl generation pattern to use (default to update, set to none to disable it):
# jpa.ddl=update

# can you try this?
jpa.ddl=create

, ?

2 ...