ManyToManyを維持する方法

Question

エンティティCookbook,があります。それはManyToManyの関係です：クックブックは複数のレシピを持つことができ、レシピは複数の料理ブックに割り当てることができます。そこで、エンティティCookbookRecipeを追加し、エンティティをOneToManyとして接続しました。

どこCookbookとRecipeとの関係を追加/削除する方法を置くためには - このメソッドは、新しいCookbookRecipeを追加し、CookbookとRecipeにこのCookbookRecipeを追加する必要がありますでしょうか？ 私の理解では、私は

public void addRecipe(Recipe recipe) { 
    CookbookRecipe relation = new CookbookRecipe(); 
    relation.setCookbook(this); 
    relation.setRecipe(recipe); 
    this.cookbookRecipes.add(relation); 
} 

が、これは正しい方向です期待しますか？ このメソッドをCookbook DAOまたはRecipe DAOに追加するか、またはこれをサービスに追加しますか？

@Entity 
public class Cookbook { 
    private Integer id; 
    private String title; 
    private Collection<CookbookRecipe> cookbookRecipes; 
    private Collection<CookbookSortlevel> cookbookSortlevels; 

    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    @Column(name = "id") 
    public Integer getId() { 
     return id; 
    } 

    public void setId(Integer id) { 
     this.id = id; 
    } 

    @Basic 
    @Column(name = "title") 
    public String getTitle() { 
     return title; 
    } 

    public void setTitle(String title) { 
     this.title = title; 
    } 

    @Override 
    public boolean equals(Object o) { 
     if (this == o) return true; 
     if (o == null || getClass() != o.getClass()) return false; 

     Cookbook cookbook = (Cookbook) o; 

     if (id != null ? !id.equals(cookbook.id) : cookbook.id != null) return false; 
     if (title != null ? !title.equals(cookbook.title) : cookbook.title != null) return false; 

     return true; 
    } 

    @Override 
    public int hashCode() { 
     int result = id != null ? id.hashCode() : 0; 
     result = 31 * result + (title != null ? title.hashCode() : 0); 
     return result; 
    } 

    @OneToMany(mappedBy = "cookbook", fetch = FetchType.EAGER) 
    public Collection<CookbookRecipe> getCookbookRecipes() { 
     return cookbookRecipes; 
    } 

    public void setCookbookRecipes(Collection<CookbookRecipe> cookbookRecipes) { 
     this.cookbookRecipes = cookbookRecipes; 
    } 

    @OneToMany(mappedBy = "cookbook") 
    public Collection<CookbookSortlevel> getCookbookSortlevels() { 
     return cookbookSortlevels; 
    } 

    public void setCookbookSortlevels(Collection<CookbookSortlevel> cookbookSortlevels) { 
     this.cookbookSortlevels = cookbookSortlevels; 
    } 
} 

@Entity 
@Table(name = "cookbook_recipe", schema = "", catalog = "") 
public class CookbookRecipe { 
    private Integer id; 
    private Recipe recipe; 
    private Cookbook cookbook; 

    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    @Column(name = "id") 
    public Integer getId() { 
     return id; 
    } 

    public void setId(Integer id) { 
     this.id = id; 
    } 

    @Override 
    public boolean equals(Object o) { 
     if (this == o) return true; 
     if (o == null || getClass() != o.getClass()) return false; 

     CookbookRecipe that = (CookbookRecipe) o; 

     if (id != null ? !id.equals(that.id) : that.id != null) return false; 

     return true; 
    } 

    @Override 
    public int hashCode() { 
     int result = id != null ? id.hashCode() : 0; 
     return result; 
    } 

    @ManyToOne 
    @JoinColumn(name = "recipe_id", referencedColumnName = "id") 
    public Recipe getRecipe() { 
     return recipe; 
    } 

    public void setRecipe(Recipe recipe) { 
     this.recipe = recipe; 
    } 

    @ManyToOne 
    @JoinColumn(name = "cookbook_id", referencedColumnName = "id", nullable=false,insertable=false,updatable=false) 
    public Cookbook getCookbook() { 
     return cookbook; 
    } 

    public void setCookbook(Cookbook cookbook) { 
     this.cookbook = cookbook; 
    } 
} 


@Entity 
public class Recipe { 
    private Integer id; 
    private String title; 
    private String text; 

    private Collection<RecipeIngredient> recipeIngredients; 

    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    @Column(name = "id") 
    public Integer getId() { 
     return id; 
    } 

    public void setId(Integer id) { 
     this.id = id; 
    } 

    @Basic 
    @Column(name = "title") 
    public String getTitle() { 
     return title; 
    } 

    public void setTitle(String title) { 
     this.title = title; 
    } 

    @Basic 
    @Column(name = "text") 
    public String getText() { 
     return text; 
    } 

    public void setText(String text) { 
     this.text = text; 
    } 

    @Override 
    public boolean equals(Object o) { 
     if (this == o) return true; 
     if (o == null || getClass() != o.getClass()) return false; 

     Recipe recipe = (Recipe) o; 

     if (id != null ? !id.equals(recipe.id) : recipe.id != null) return false; 
     if (title != null ? !title.equals(recipe.title) : recipe.title != null) return false; 
     if (text != null ? !text.equals(recipe.text) : recipe.text != null) return false; 

     return true; 
    } 

    @Override 
    public int hashCode() { 
     int result = id != null ? id.hashCode() : 0; 
     result = 31 * result + (title != null ? title.hashCode() : 0); 
     result = 31 * result + (text != null ? text.hashCode() : 0); 
     return result; 
    } 

    @OneToMany(mappedBy = "recipe") 
    public Collection<RecipeIngredient> getRecipeIngredients() { 
     return recipeIngredients; 
    } 

    public void setRecipeIngredients(Collection<RecipeIngredient> recipeIngredients) { 
     this.recipeIngredients = recipeIngredients; 
    } 
} 

これを処理するgithubプロジェクトはありますか？

Answer 1

これは、私にとって正しい方向です。コードはよく見える

クックブックにレシピが含まれていないため、クックブックに追加する必要があると思います