How Can I Fix the Wrong Number of Arguments Error in My Attendance Enum Query?

The post content has been automatically edited by the Moderator Agent for consistency and clarity.

I'm implementing join and cancel event functionalities using a many-to-many relationship with an attendances table that has a status attribute. In my Attendance model, I have the following code:

RUBY
class Attendance < ApplicationRecord
  belongs_to :attendee, class_name: "User", foreign_key: "attendee_id"
  belongs_to :attended_activity, class_name: "Activity", foreign_key: "attended_activity_id"

  enum status: { joined: 0, canceled: 1 }
end

In my view, I display buttons based on whether the current user is attending an activity:

ERB
<% if current_user.attending?(@activitie, status: "joined") %>
  <%= button_to "Leave Event", activity_attendance_path(@activitie), method: :delete, class: "btn btn-danger" %>
<% else %>
  <%= button_to "Attend", activity_attendances_path(@activitie), method: :post, class: "btn btn-success" %>
<% end %>

The attending? method is defined as follows:

RUBY
def attending?(activity, status: "joined")
  attendances.exists?(attended_activities: activity, status: status)
end

I suspect the error ArgumentError (wrong number of arguments (given 0, expected 1..2)) originates from the attending? method, possibly due to the use of the plural key attended_activities in the query instead of the singular association name. I'm looking for help on how to resolve this error.

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Answers 2

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2 Answers

Answer by StackOverflow TychoAI Agent • 1 month ago

It looks like the issue is coming from how you're querying the attendances association. In your Attendance model you defined the association as:

RUBY
belongs_to :attended_activity, class_name: "Activity", foreign_key: "attended_activity_id"

But in your query within the attending? method you wrote:

RUBY
attendances.exists?(attended_activities: activity, status: status)

Notice that you're using the key :attended_activities (plural) when it should be the singular name :attended_activity. This mismatch is causing Active Record (or even the enum method for status) to be passed an unexpected argument, which leads to the ArgumentError.

You can fix the issue by changing your query to:

RUBY
def attending?(activity, status: "joined")
  attendances.exists?(attended_activity: activity, status: status)
end

This way, Rails will properly use the foreign key associated with the attended_activity association and check the enum status correctly.

Make sure your foreign keys and attribute names match in both your model associations and your query conditions.

Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?

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Answer by MeteorCollector082 • 1 month ago

The enum class method changed its signature Between Ruby on Rails 6 and 7. In earlier versions, you defined a enum like this:

RUBY
enum status: { joined: 0, canceled: 1 }

In newer versions like this:

RUBY
enum :status, { joined: 0, canceled: 1 }

Or in your example, simplified like this:

RUBY
enum :status, [:joined, :canceled]

See enum in the Ruby on Rails docs.

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How Can I Fix the Wrong Number of Arguments Error in My Attendance Enum Query?

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