Question

I have a Rails Application that is having User ,Role , Group models.

User Model

has_and_belongs_to_many :roles
has_and_belongs_to_many :groups

Role Model

has_and_belongs_to_many :users

Group Model

has_and_belongs_to_many :users

I have also created a mapping tables like,

roles_users and groups_users for mapping their id

So here each user can have multiple groups ans roles ,

in my role model there is only three entries,

admin with id 1,
trainer with id 2,
trainee with id 3

i want to find all users under a particular group with role id = 3,

i have done like this,

@group = Group.find(2)
@users = @group.users

here i am getting all users under group id =2 ,but i want to filter it again with role id = 3. How to fix this.

Any help is appreciated.

Answer 1

Try:

@group = Group.find(2)
@users = @group.users.joins(:roles).where("roles.id = ? && users.age = ?",3,30)