数组属性上的rails强参数错误

Question

i try to post my json to rails server with this request body

    {"post":{
    "user_id": 2,
    "title": "kehangatan di pagi hari",
    "category": "kehangatan di pagi hari",
    "imageposts": [{"imageurl":"DJAWHDAHWDKJHAW DHJAWDHAWDAWDAD"}],
    "description":"<p>memang sange</p>"
  } }

and this is my posts_params

  def post_params
    params.require(:post).permit(:title, :user_id, :description, :category, :imageposts => [:imageurl])
  end

unfortunately when i make an ajax post i got an error in my terminal

#<ActiveRecord::AssociationTypeMismatch: Imagepost(#42287660) expected, got ActiveSupport::HashWithIndifferentAccess(#30074960)>

i've trying this to my imageposts strong parameter but it doesnt work too

imageposts: [:imageurl]

can anybody solve this...

Answer 1

The strong params are fine. The problem is that imageposts is an association, but, just a guess, it is tried to be set as an attribute post.update_attributes(post_params)

If you want it to be updated like this, the possible solution is to use accepts_nested_attributes_for :

Your model must have something like:

class Post
  belongs_to :user
  has_many :imageposts
  accepts_nested_attributes_for :imageposts
end

And the name of params must be imageposts_attributes instead of just imageposts :

def post_params
  params.require(:post).permit(:title, :user_id, :description, :category, :imageposts_attributes => [:imageurl])
end

Answer 2

You are passing multiple images. So you can use coocoon gem with accepts_nested_attributes_for

for more info https://github.com/nathanvda/cocoon