How to POST/PUT array param in Rails

Question

My controller methods work great for my ERB forms, but aren't accepting arrays as JSON parameters. I have an array of ids called "style_ids" that gets stripped out from JSON.

Permitted parameters:

params.require(:beer).permit(:name, :brewery_id, :style_ids => [])

When posted from ERB, it looks like this:

all params: {"utf8"=>"✓", "_method"=>"patch", "authenticity_token"=>”…”, "beer"=>{"name"=>"Amber", "style_ids"=>["", "1"], "brewery_id"=>"16"}, "commit"=>"Submit", "action"=>"update", "controller"=>"beers", "id"=>"213"} permitted params: {"name"=>"Amber", "brewery_id"=>"16", "style_ids"=>["", "1"]}

When I submit via JSON though, it looks like this:

params: {"id"=>"213", "name"=>"Amber", "style_ids"=>["1", "22"], "brewery_id"=>16, "action"=>"update", "controller"=>"beers", "beer"=>{"id"=>213, "name"=>"Amber", "brewery_id"=>16}} Unpermitted parameters: id permitted params: {"name"=>"Amber", "brewery_id"=>16}

I'm guessing this has something to do with Rails showing style_ids inside the beer hash in my regular request. What am I doing wrong that's keeping this from showing up in my JSON request? The JSON is really simple: {"id":213,"name":"Amber","style_ids":["1","22"],"brewery_id":16}

I've already read a lot of documentation about this and feel like I'm doing it the right way...hopefully I'm just missing something. Thanks!

hi Dennis, where is your controller permit parameters action? — Tim Kretschmer
– Tim Kretschmer, Commented Sep 9, 2015 at 5:31
Actually that should be inside beer. See what you have written on controller is params.require(:beer) which means the params hash has a key named beer and the attributes to permit are inside it. In your JSON request you have this: "beer"=>{"id"=>213, "name"=>"Amber", "brewery_id"=>16} from which id is not permitted so it is showing Unpermitted parameters: id. Of the rest it don't cares whatever you are sending. Because rails will use the attributes inside beer to create/update it. — Deepesh
– Deepesh, Commented Sep 9, 2015 at 5:37
So why isn't style_ids inside of the beer hash when using JSON? Rails considers the other arguments inside that hash, but not style_ids. @huanson, I'm not sure I follow... the entire permit parameters is inside a function: def beer_params params.require(:beer).permit(:name, :brewery_id, :style_ids => []) end I call this from my update and create functions. — Dennis
– Dennis, Commented Sep 9, 2015 at 5:46

Dennis · Accepted Answer · 2015-09-13 22:46:56Z

I finally figured out this out. Rails is using wrap_parameters so I can use {“name": “name”} instead of {“beer:{“name” : “name”}}. by default Rails wraps anything from your model’s attribute_names.

My problem was style_ids is an external join table (has_and_belongs_to_many), so that’s not in the attribute_names. I fixed this by adding this to the top of my controller: wrap_parameters :beer, include: [:style_ids, :name, :brewery_id]

The link that finally got me through this: http://api.rubyonrails.org/classes/ActionController/ParamsWrapper.html

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