带有Postgres数组的Ruby on Rails

Question

I'm currently having an issue with Ruby on Rails (4.2.5) and Postgres (9.4.5) Arrays. The model attribute believes it is a type String which isn't working when trying to assign an Array. My migration has:

# create a urls array
t.text :urls, array: true, default: []

Then in my controller I have:

def create
  @lead = Lead.new(lead_params)
  ...
end

def lead_params
  params.require(:lead).permit(:name, :base_url, urls: [])
end

Unfortunately, when debugging with byebug I see:

(byebug)  lead_params['urls'].class
Array
(byebug) @lead.urls.class
String
(byebug) @lead.urls      
"[\"asd\", \"\", \"\", \"\", \"\"]"

The :urls attribute of my Lead class isn't thinking it is an Array. I have no code in my model (which might be the problem?).

Any thoughts much appreciated!

Answer 1

您可能想要将类型从text更改为string

t.string :urls, array: true, default: []

Answer 2

Thanks to the comment from @muistooshort I found the database schema was indeed wrong. Somehow in all of my Docker wisdom I had managed to get schema.rb out of sync with the actual migrations.

Now the schema.rb correctly shows:

t.text     "urls",            default: [],              array: true

And everything works as expected :-)

The trick was the run the following:

rake db:drop
rake db:create
rake db:migrate

I think I had previously run some rake db:rest commands which seem to have led to the issue.