爲什麼user_id未分配comment_id？

Question

我試圖創建一個博客，我有3個模型post,user,comment。當我創建comment時，comment.post_id是nil。我究竟做錯了什麼？

comments_controller

def new 
    @comment = Comment.new 
    end 

    def edit 
    @post = Post.find(params[:post_id]) 
    end 

    def create 
    @post = Post.find(params[:post_id]) 
    @comment = @post.comments.create(comment_params) 
    @comment.user_id = current_user 
    redirect_to post_path(@post) 
    end 

編輯

post.rb

has_many :comments, dependent: :destroy 
    belongs_to :user 

comment.rb

belongs_to :user 
    belongs_to :post 

user.rb

has_many :posts, dependent: :destroy 

    has_many :comments, dependent: :destroy 

Answer 1

這裏是溶液：

def create 
    @post = Post.find(params[:post_id]) 
    @comment = @post.comments.new(params[:comment]) 
    @comment.user_id = current_user.id 
    @comment.save 
    redirect_to post_path(@post) 
end 

來源：Answer in stackoverflow

所以，使用以下關聯如上源。

Answer 2

希望這會起作用。

def create 
    @post = Post.find(params[:post_id]) 
    @comment = Comment.new(comment_params.merge(user_id: current_user.id)) 
    @post.comments << @comment 
    redirect_to post_path(@post) 
end