feat(dunning): Add DunningCampaigns::CreateService

app/graphql/mutations/dunning_campaigns/create.rb

@@ -16,7 +16,8 @@ class Create < BaseMutation
       type Types::DunningCampaigns::Object
 
       def resolve(**args)
-        # TODO: Implement the resolver via ::DunningCampaigns::CreateService.call
+        result = ::DunningCampaigns::CreateService.call(organization: current_organization, params: args)
+        result.success? ? result.dunning_campaign : result_error(result)
       end
     end
   end

app/services/dunning_campaigns/create_service.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+module DunningCampaigns
+  class CreateService < BaseService
+    def initialize(organization:, params:)
+      @organization = organization
+      @params = params
+
+      super
+    end
+
+    def call
+      dunning_campaign = organization.dunning_campaigns.new(
+        applied_to_organization: params[:applied_to_organization],
+        code: params[:code],
+        days_between_attempts: params[:days_between_attempts],
+        max_attempts: params[:max_attempts],
+        name: params[:name],
+        description: params[:description]
+      )
+
+      dunning_campaign.save!
+
+      result.dunning_campaign = dunning_campaign
+      result
+    rescue ActiveRecord::RecordInvalid => e
+      result.record_validation_failure!(record: e.record)
+    end
+
+    private
+
+    attr_reader :organization, :params
+  end
+end

spec/graphql/mutations/dunning_campaigns/create_spec.rb

@@ -0,0 +1,52 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe Mutations::DunningCampaigns::Create, type: :graphql do
+  let(:required_permission) { "dunning_campaigns:create" }
+  let(:membership) { create(:membership) }
+  let(:input) do
+    {
+      name: "Dunning campaign name",
+      code: "dunning-campaign-code",
+      description: "Dunning campaign description",
+      maxAttempts: 3,
+      daysBetweenAttempts: 1,
+      appliedToOrganization: false
+    }
+  end
+
+  let(:mutation) do
+    <<-GQL
+      mutation($input: CreateDunningCampaignInput!) {
+        createDunningCampaign(input: $input) {
+          id name code description maxAttempts daysBetweenAttempts appliedToOrganization
+        }
+      }
+    GQL
+  end
+
+  it_behaves_like "requires current user"
+  it_behaves_like "requires current organization"
+  it_behaves_like "requires permission", "dunning_campaigns:create"
+
+  it "creates a dunning campaign" do
+    result = execute_graphql(
+      current_user: membership.user,
+      current_organization: membership.organization,
+      permissions: required_permission,
+      query: mutation,
+      variables: { input: }
+    )
+
+    expect(result["data"]["createDunningCampaign"]).to include(
+      "id" => String,
+      "name" => "Dunning campaign name",
+      "code" => "dunning-campaign-code",
+      "description" => "Dunning campaign description",
+      "maxAttempts" => 3,
+      "daysBetweenAttempts" => 1,
+      "appliedToOrganization" => false
+    )
+  end
+end