Params Error (ActiveModel::ForbiddenAttributesError)

0
votes

I'm getting a "ActiveModel::ForbiddenAttributesError in CommentsController#create" with highlights in "@comment = @post.comments.build(params[:comment])"

def create
    @post = Post.find(params[:post_id])
    @comment = @post.comments.build(params[:comment])

    respond_to do |format|
      if @comment.save
        format.html { redirect_to @post, notice: 'Comment was successfully created.' }
        format.json { render action: 'show', status: :created, location: @comment }
      else
        format.html { render action: 'new' }
        format.json { render json: @comment.errors, status: :unprocessable_entity }
      end
    end
  end

in the tutorial video the coder puts this in and works perfect yet when I post this it gives an error. I have checked through the code and cannot to seem to see whats wrong. Thanks in advance!

1
ruby-on-railsrubyparams

1 Answers

2
votes

Looking at the error, I am assuming that you must be using Rails 4. Strong Parameters were introduced in Rails 4. See Strong Parameters reference here.

Replace 

 @comment = @post.comments.build(params[:comment])

with

 @comment = @post.comments.build(comment_params)

Add a private method in your controller as follows:

  def comment_params
    params.require(:comment).permit(:attr1, :attr2,...)
  end

where :attr1, :attr2 would be the attributes name of Comment model.