jointable

Hey guys. This is my table of how it works: I want to be able to count the number of views (the views are unique which contains user's IP), for records that matches record in another table, for example I do a GET request and a SQL query will find matches and count the number of views that have been collected for each record, so it'll display something like this: GET query: stack Display: record_id | keyword | total_views ---------------------------------------------------- 2 | stack | 2 ---------------------------------------------------- 5 | stack | 1 As you can see in the table there are 2

I don't know since when this is possible, but I just created composite keys the way I always wanted: No @EmbeddedId and no @IdClass required!! Spring 4.0.0.M3 Hibernate 4.3.0.Beta4 JPA 2.1 User.java : @Entity public class User { @Id ... @OneToMany(mappedBy="user", cascade=CascadeType.ALL, orphanRemoval=true) private List<GroupUser> groupUsers; } Group.java : @Entity public class Group { @Id ... @OneToMany(mappedBy="user", cascade=CascadeType.ALL, orphanRemoval=true) private List<GroupUser> groupUsers; } GroupUser.java : @Entity public class GroupUser implements Serializable { @Id @ManyToOne

I need a player to have many structures and the structure to belong to the player. Structure is a polymorphic relationship. class Player < ActiveRecord::Base has_many :player_structures has_many :structures, :through => player_structures end class PlayerStructures < ActiveRecord::Base belongs_to :structure, polymorphic: true belongs_to :player end class StructureA < ActiveRecord::Base has_one :player_structure, :as => :structure has_one :player, :through => :player_structure end class StructureB < ActiveRecord::Base has_one :player_structure, :as => :structure has_one :player, :through =>

I was considering adding some extra properties between a has_many relationship. For example, I have a Users table, and a Group table. Users can join groups via a :through has_many relationship. I want to add the property of the 'role' of the user in that group. create_table "groupization", :force => true do |t| t.integer "user_id" t.integer "group_id" t.string "role" t.datetime "created_at", :null => false t.datetime "updated_at", :null => false end I was wondering, how can I access the role attribute. I was thinking something like: user.groups[0].role Is that a correct approach? I know the

I am new to programming & rails and there's something I dont fully understand. I am creating an app with product has_many categories category has_many products If I understand correctly I need to create a join table products_categories which has a product_id & a category_id . First do I also need a model for this table ? if yes I guess it would look like this : class CategoryProduct < ActiveRecord::Base belongs_to :category belongs_to :product end and the other models in product.rb : class Product < ActiveRecord::Base has_many :category_products has_many :categories, through: :category_product

I need to create table PORTATION_MODEL_SET. And I need to create two keys from table portation and one key from table phone_model I have code: @Entity @Table(name="PORTATION") @SecondaryTable(name="PORTATION") @Cache(usage=CacheConcurrencyStrategy.NONSTRICT_READ_WRITE) public class JDBCPortation implements Portation { @Id @GeneratedValue(strategy=GenerationType.AUTO) private Integer id; @ManyToOne(targetEntity=JDBCContentMetaData.class, fetch=FetchType.LAZY) @JoinColumn(name="fk_content_id",nullable=false) private JDBCContentMetaData content; @ManyToMany(cascade={CascadeType.ALL},fetch