Say I have a Domain Object User which contains an Organization field. I can map that using a foreign key and let hibernate take care of the rest like so:
class User {
String id
String firstName
Organization organization
static mapping = {
table 'user'
id column: "user_id", generator:'assigned'
organization column: 'organization_Id'
}
}
class Organization {
String id
String name
String address
static mapping = {
table 'organization'
id column: "organization_id", generator:'assigned'
}
}
This works fine, but when I want to query for all users in an organization I might have to do something like this
String orgId = "some id"
Organization org = Organization.findById(orgId)
List<User> users = User.findAllByOrganization(org)
It would be convenient to not have to pass the Organization domain object and instead just pass the Organization.Id which is the foreign key on the User table.
How I want my code to look is the following:
String orgId = "some id"
List<User> users = User.findAllByOrganization(orgId)
After researching, it seems like this is not possible, I need to first query for the Organization and then use that object. Is there a way I am unaware of?
One way I like to do it is to use a proxy of your domain object instead of a hydrated instance of it. You can use load() to obtain the proxy. This means no database call is made as long as you don't access any of the domain object's properties beyond the id.
def users = Users.findByOrganization(Organization.load(orgId))
You can use a Criteria:
String orgId = "some id"
List<User> users = User.createCriteria().list {
organization {
idEq(orgId)
}
}
You have two options there:
add a redundant orgId field to you User class and use it for the
lookup.
Use a fake object for your lookup:
.
Organization org = new Organization()
org.id = 'someId' // looks strange, but you can not use id inside constructor
def users = Users.findAllByOrganization org
Related
using asp mvc 4.
When the user goes to a student record, the URL says:
http://studentTracker.org/Record/Student?studentId=380
Currently a user can change the studentId right there in the url and get that students record, unless it doesn't exist. How can I either hide the query string part of the url, or detect/validate at the controller if the user has changed the url?
First, you cannot stop a user from doing anything, really, especially something like changing an id in a URL. What you can do is ensure that if they do so, they get something like a 404 or 403, instead of the actual content.
The way to do that is to do object-level permissioning, which basically just means tying the object to the user(s) allowed to view/edit it in some way. Usually, this will done via foreign key to something like your "user" entity or something broader like a group or role.
For example, if the "Student 380" record is owned by jdoe, then you can prevent access to it by anyone but jdoe by first adding a foreign key to your "user" entity on your "student" entity. (Assuming Identity, since unspecified):
public class Student
{
...
[ForeignKey("Owner")]
public string OwnerId { get; set; }
public virtual ApplicationUser Owner { get; set; }
}
Then, in your action, instead of querying by just the id, you query by both the id in the URL and the id of the authenticated user:
var userId = User.Identity.GetUserId();
var student = db.Students.SingleOrDefault(m => m.Id == studentId && m.OwnerId == userId);
if (student == null)
{
return new HttpNotFoundResult();
}
Now, if the user changes studentId but is not set as the "owner" of the student that matches, they'll get a 404.
I have the following:
GroupMember.groovy
public class GroupMember{
String userName
String role
}
GroupProfile.groovy
public class GroupProfile{
List<GroupMember> groupMembers = new ArrayList<GroupMember>()
}
GroupProfileController.groovy
public class GroupProfileController{
def createProfile{
GroupMember groupOwner = new GroupMember()
groupOwner.userName = "testUser"
groupOwner.role = "OWNER"
groupOwner.save()
GroupProfile groupProfile = new GroupProfile()
def members = grouProfile.groupMembers
members.add(groupOwner)
groupProfile.save()
GroupProfile.list() //This list contains my GroupMember instance with the correct info
redirecT(action: myProfiles)
}
def myProfiles={
GroupProfile.list() //This list contains my groupProfile that I made but no GroupMember info
}
}
My GroupProfile won't save my GroupMember info. How can I get my GroupProfile to save the GroupMember info?
The normal way to represent this relationship in grails would be:
public class GroupProfile {
static hasMany = [groupMembers: GroupMember]
}
This will automatically generate a method on GroupProfile called addToGroupMembers that will create the associations. Saving the GroupProfile will also cascade to the group members, so you'll only need to call save once after adding the members.
Note that the groupMembers collection will actually be an instance of Set that doesn't necessarily preserve order. You can explicitly declare the collection as a List to preserve order, but it requires additional overhead including an extra database column, so make sure that's really what you want.
Check out the grails manual in the section on GORM: http://grails.org/doc/latest/guide/GORM.html
I am new to Grails and GORM and I am trying to One to Many relationship but not with default id field. Here is my scenario:
Table structure in the database:
USERPROFILE
iduserprofile
username
ROLE
idrole
rolename
USER_ROLE
iduserprofile
idrole
Domains:
class Userprofile {
long iduserprofile
String username
static mapping = {
datasource 'ALL'
id name: 'iduserprofile'
version false
}
class Role {
long idrole;
String rolename;
static mapping = {
datasource 'ALL'
id name: 'idrole'
version false
}
}
class UserRole {
Userprofile user
Role role
static mapping = {
datasource 'ALL'
version false
}
}
When I try to get the user or role object from UserRole domain, it is always looking for user_id or role_id in the USER_ROLE table.
Why is it not looking for iduserprofile or idrole? How can i change the code to look for isuserprofile or idrole?
Thanks
GORM by convention will use/generate id as identifier for your domains. If you have legacy tables or just a desire to break convention, you'll need to specify your custom column names. For example for Role mapping, add the following:
static mapping = {
datasource 'ALL'
id name: 'idrole', column: 'idrole'
version false
}
It seems to me that the easiest thing to do would be to copy your database and then change the names of the id fields if you have legacy tables. If not then just make life simple by conforming to convention.
I'm new to Groovy and HQL querying but I can't find a solution to this anywhere so it's driving me nuts.
I have two Domain classes which have a one to many relationship defined (a user can have many companies) and I effectively need to do (what would traditionally be called) 'a table join' but clearly with objects.
The classes go like this:
class User {
transient springSecurityService
static hasMany = [company: Company]
String username
String password
boolean enabled
boolean accountExpired
boolean accountLocked
boolean passwordExpired
...
...
...
}
... and the company class
class Company {
static scaffolding = true
String name
String address1
String address2
String address3
String address4
String postCode
String telephone
String mobile // mobile number to receive appointment text messages to
String email // email address to receive appointment emails to
static hasMany = [staff: Staff]
static belongsTo = [user: User]
...
...
...
}
Gorm has created an user_id field within the company table but any attempt to use this in a query returns an error.
So how would I do something like:
select * from user u, company c, where u.id = c.user_id;
What is the best way to do this?
You can effectively use join on the association something like:
HQL
select * from User as u inner join fetch u.company as companies where u.id = ?
Note that using fetch in the query would eagerly fetch the associated collections of companies for a user
findAll()
User.findAll("from User as u inner join fetch u.company as companies where u.id = ?", [1])
Benefit of using findAll instead of HQL is that you can easily implement pagination something like:
User.findAll("from User as u inner join fetch u.company as companies where u.accountExpired = true", [max: 10, offset: 5])
To get a concrete implementation and really understand things in details I would insist to have a look at findAll and HQL associations.
I have the following method in a service, please note the .user on the def usersByRole line:
def getUsersByRole(String desiredRole1, String desiredRole2, String desiredRole3) {
Role role1 = Role.findByAuthority(desiredRole1)
Role role2 = Role.findByAuthority(desiredRole2)
Role role3 = Role.findByAuthority(desiredRole3)
def usersByRole = UserRole.findAllByRoleInList([role1, role2, role3]).user
return usersByRole
}
It works good, but when a user has multiple roles (i.e. ROLE_ADMIN, and ROLE_OWNER) then that user exists twice in the collection if both of the previously mentioned roles are given as parameters. Is there any clean way I can make the collection contain only unique results?
A similar question as yours can be found here: GORM createCriteria and list do not return the same results : what can I do?
Method 1
If you want to return unique list of users directly from DB query then you can use listDistinct on User (supposing that user has a roles OneToMany association with UserRoles)
User.createCriteria().listDistinct {
roles {
in 'role', [role1, role2, role3]
}
}
Method 2
You can also try to query UserRole directly and group by User using the groupProperty (see http://www.grails.org/doc/latest/ref/Domain%20Classes/createCriteria.html)
Method 3
Remove duplicated users from the returned list:
UserRole.findAllByRoleInList([role1, role2, role3])*.user.unique()
The finder will return a List, and calling .user also returns a List, but you can cheat and cast it to a Set and it will remove duplicates. Since there's no order needed (you're returning def so it doesn't appear that you care about the collection type) you don't need to convert it back:
def getUsersByRole(String desiredRole1, String desiredRole2, String desiredRole3) {
Role role1 = Role.findByAuthority(desiredRole1)
Role role2 = Role.findByAuthority(desiredRole2)
Role role3 = Role.findByAuthority(desiredRole3)
return UserRole.findAllByRoleInList([role1, role2, role3]).user as Set
}
This presumes that you have a well-defined equals and hashCode in your User class so the uniqueness check makes sense.