Cameron Bass Cameron Bass - 2 months ago 6
Ruby Question

How to convert a string to an array using Ruby on Rails

I have a text field that takes in a string value, like

"games,fun,sports"


My main goal here is to take the string and turn it into a Array like this:

[games, fun, sports]


in the filters attribute for the integrations object I have. Right now I have the beginning of a method that doesn't seem to work.

Here is my code:

View:

<%= form_for @integrations, url: url_for(:controller => :integrations, :action => :update, :id => @integrations.id) do |f| %>
<%= f.label :filters %>
<%= f.text_field :filters, class: "filter-autocomplete" %>
<%= f.submit "Save" %>
<% end %>


That is the text field that takes in the string.

Model:

def filters=(filters)

end


This is the place that I'd like to make the switch from string to array.

Controller:

def update
@integrations = current_account.integrations.find(params[:id])

if @integrations.update_attributes(update_params)
flash[:success] = "Filters added"
redirect_to account_integrations_path
else
render :filters
end
end

def filters
@integrations = current_account.integrations.find(params[:id])
end

private

def update_params
[:integration_webhook, :integration_pager_duty, :integration_slack].each do |model|
return params.require(model).permit(:filters) if params.has_key?(model)
end
end


So, recap: I have a integrations model that takes in a string of filters. I want a method that will break up the string into an element of filter attributes.

Here is the object that I'm trying to add the filters to:

Object:

id: "5729de33-befa-4f05-8033-b0acd5c4ee4b",
user_id: nil,
type: "Integration::Webhook",
settings: {"hook_url"=>"https://hooks.zapier.com/hooks/catch/1062282/4b0h0daa/"},
created_at: Mon, 29 Aug 2016 03:30:29 UTC +00:00,
owner_id: "59d4357f-3210-4ddc-9cb9-3c758fc1ef3a",
filters: "[\"Hey\", \"ohh\"]">


As you can see the
filters
is what I'm trying to modify. Instead of this in the object:

"[\"Hey\", \"ohh\"]"


I would like this:

[Hey, ohh]

Answer

It's not clear what you're after, but generally, when you have a string like:

"games,fun,sports"

you can use split(',') to break it on the commas and turn it into an array of strings:

"games,fun,sports".split(',') # => ["games", "fun", "sports"]

If you're receiving a JSON encoded array of strings, it'll look like:

'["games", "fun", "sports"]'

AKA:

'["games", "fun", "sports"]' # => "[\"games\", \"fun\", \"sports\"]"

which can be returned to a Ruby array of strings easily enough:

require 'json'

JSON['["games", "fun", "sports"]'] # => ["games", "fun", "sports"]
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