cahyowhy cahyowhy - 3 years ago 95
Ruby Question

rails strong parameter error on array attribute

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

"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])

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 Source

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

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])
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