[Feature] Transfers added to admin & import from csv

app/admin/transfer.rb

@@ -0,0 +1,40 @@
+ActiveAdmin.register Transfer do
+  action_item :upload_csv, only: :index do
+    link_to I18n.t("active_admin.users.upload_from_csv"), action: "upload_csv"
+  end
+
+  collection_action :upload_csv do
+    render "admin/csv/upload_csv"
+  end
+
+  collection_action :import_csv, method: :post do
+    errors = TransferImporter.call(params[:dump][:organization_id], params[:dump][:file])
+    flash[:error] = errors.join("<br/>").html_safe if errors.present?
+
+    redirect_to action: :index
+  end
+
+  index do
+    id_column
+    column :post
+    column :reason
+    column :source do |transfer|
+      acc = transfer.movements.find_by('amount < 0').account.accountable
+      acc.class.name == "Member" ? acc.user : acc
+    end
+    column :destination do |transfer|
+      acc = transfer.movements.find_by('amount > 0').account.accountable
+      acc.class.name == "Member" ? acc.user : acc
+    end
+    column :amount do |transfer|
+      transfer.movements.find_by('amount > 0').amount
+    end
+    column :created_at do |transfer|
+      l transfer.created_at.to_date, format: :long
+    end
+    column :organization do |transfer|
+      transfer.movements.first.account.organization
+    end
+    actions
+  end
+end

app/services/transfer_importer.rb

@@ -0,0 +1,78 @@
+# Used in the Admin section to import transfers
+# to a specific organization, from a CSV file.
+
+require "csv"
+
+class TransferImporter
+  Row = Struct.new(
+    :source_id,
+    :source_type,
+    :destination_id,
+    :destination_type,
+    :amount,
+    :created_at,
+    :reason,
+    :post_id
+  ) do
+    def transfer_from_row(organization_id, errors)
+      source = find_account(source_id, source_type, organization_id, errors, 'source')
+      destination = find_account(destination_id, destination_type, organization_id, errors, 'destination')
+      return unless source && destination
+
+      Transfer.new(
+        source: source,
+        destination: destination,
+        amount: amount,
+        created_at: created_at,
+        reason: reason,
+        post_id: post_id,
+      )
+    end
+
+    private
+
+    def find_account(id, type, organization_id, errors, direction)
+      acc = if type.downcase == 'organization'
+              Organization.find(organization_id).account
+            else
+              Member.find_by(member_uid: id, organization_id: organization_id)&.account
+            end
+
+      unless acc
+        errors.push(account_id: id, errors: "#{direction}_id #{id} not found in organization #{organization_id}")
+        return false
+      end
+      acc
+    end
+  end
+
+  class << self
+    def call(organization_id, csv_data)
+      data = csv_data.read
+      errors = []
+
+      CSV.parse(data, headers: false) do |data_row|
+        row = Row.new(
+          data_row[0],
+          data_row[1],
+          data_row[2],
+          data_row[3],
+          data_row[4],
+          data_row[5],
+          data_row[6],
+          data_row[7]
+        )
+        process_row(row, organization_id, errors)
+      end
+
+      errors
+    end
+
+    def process_row(row, organization_id, errors)
+      transfer = row.transfer_from_row(organization_id, errors)
+      return if !transfer || transfer.save
+
+      errors.push(account_id: row.source_id, errors: transfer.errors.full_messages)
+    end
+  end
+end