Rails How to use has_many_and_belongs_to_many with accepts_nested_attributes_for

Question

I have two models:

Routes and Activity

I have a Many-To-Many relationship between them through a migration that looks like:

class ActivitiesRoutes < ActiveRecord::Migration
    def up
        create_table :activities_routes, :id => false do |t|
            t.integer :route_id
            t.integer :activity_id
        end
    end
end

In a rest service i get the data for a route and I get multiple activities, my models look like this:

class Route < ActiveRecord::Base
  attr_accessible :activities_attributes
  has_and_belongs_to_many :activities
  accepts_nested_attributes_for :activities
end

and:

class Activity < ActiveRecord::Base
  attr_accessible :activitytext, :iconid
  has_and_belongs_to_many :routes
end

On my app controller I want to make something like :

ruta=Route.create({
    #other data for the model
})
ruta.activities_attributes = @activitiesarray #Array made with the Activities received

But I get an error:

undefined method `activities_attributes' for #<Route:0x2bccf08>

If i left it like :

ruta.activities_attributes << @activitiesarray

I get:

undefined method `with_indifferent_access' for #<Activity:0x6af7400>

Does anyone know ho can I make that possible? Thank you :)

jvnill · Accepted Answer · 2013-02-28 23:50:59Z

1

You can't do this

ruta.activities_attributes << @activitiesarray

because accepts_nested_attributes_for only provides a *_attributes= method so the following should work

ruta.activities_attributes = @activitiesarray

answered Feb 28, 2013 at 23:50

jvnill

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4 Comments

ArcherDragon57 Over a year ago

Sorry, I missed a correction on the question, when I left it with '=' I get: undefined method `activities_attributes' for #<Route:0x2bccf08> Updated the question :)

jvnill Over a year ago

now that you mentioned it, you are using habtm which is not going to work with accepts_nested_attributes_for

ArcherDragon57 Over a year ago

Could I use has_many and :through and create a join table instead of a migration?

jvnill Over a year ago

yes, you should use has_many through when you are going to add more details in the join table. you should also use a migration to create the join table.

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