Create a record in Rails from AngularJS

Question

I have an Angular application that sends http requests to a rails server. I'd like to make a request to create a record (in the table SavedQueries).

The Angular app is actually making a very simple http request right now, like

$.post('http://10.241.16.159:3000/api/save_query', {'saved_query':1});

That javascript request gets routed to this Rails action:

def create
  @saved_query = SavedQuery.new(params[:saved_query])

  if @saved_query.save
    render json: @saved_query, status: :created, location: @saved_query
  else
    render json: @saved_query.errors, status: :unprocessable_entity
  end
end

However, instead of returning the appropriate json, the rails server logs a 500 error:

Started POST "/api/save_query" for 172.25.82.146 at 2014-07-31 19:14:06 +0000
Processing by SavedQueriesController#create as */*
  Parameters: {"saved_query"=>"1"}
Completed 500 Internal Server Error in 0ms

ArgumentError (When assigning attributes, you must pass a hash as an argument.):
  app/controllers/saved_queries_controller.rb:21:in `create'

So my question is, clearly by looking at the logs from the Rails server, we can see that the params passed was a hash, but the ArgumentError thrown says that the problem was that a hash must be passed as an argument.

What am I missing here?

Jakob S · Accepted Answer · 2014-07-31 19:38:11Z

3

You are receiving these parameters:

Parameters: {"saved_query"=>"1"}

ie, params[:saved_query] returns "1". Thus, when you do

@saved_query = SavedQuery.new(params[:saved_query])

you are really doing

@saved_query = SavedQuery.new("1")

and that's not going to work, as SavedQuery.new expects a Hash, not a String.

If instead you do

@saved_query = SavedQuery.new(params)

it should work.

answered Jul 31, 2014 at 19:38

Jakob S

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2 Comments

johncorser Over a year ago

Awesome! although now I'm getting "ActiveModel::ForbiddenAttributesError"

Jakob S Over a year ago

You're now running into Rails' strong parameters. You should be able to find some explanations googling for that.

Jakob S · Accepted Answer · 2014-07-31 19:41:11Z

1

@saved_query = SavedQuery.new(params[:saved_query])

Your .new on SavedQuery is essentially calling SavedQuery.new("1"), and Rails is having a problem with the value not having a key.

SavedQuery.new() #=> if no values are required

SavedQuery.new(age:1) #=> if there is an int column within the SavedQuery model, for example

edited Jul 31, 2014 at 19:41

Jakob S

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answered Jul 31, 2014 at 19:37

Chris

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