Account:: namespace simplifications and cleanup (#2110)

* Flatten Holding model

* Flatten balance model

* Entries domain renames

* Fix valuations reference

* Fix trades stream

* Fix brakeman warnings

* Fix tests

* Replace existing entryable type references in DB

app/controllers/transfer_matches_controller.rb

@@ -0,0 +1,56 @@
+class TransferMatchesController < ApplicationController
+  before_action :set_entry
+
+  def new
+    @accounts = Current.family.accounts.alphabetically.where.not(id: @entry.account_id)
+    @transfer_match_candidates = @entry.transaction.transfer_match_candidates
+  end
+
+  def create
+    @transfer = build_transfer
+    @transfer.save!
+    @transfer.sync_account_later
+
+    redirect_back_or_to transactions_path, notice: "Transfer created"
+  end
+
+  private
+    def set_entry
+      @entry = Current.family.entries.find(params[:transaction_id])
+    end
+
+    def transfer_match_params
+      params.require(:transfer_match).permit(:method, :matched_entry_id, :target_account_id)
+    end
+
+    def build_transfer
+      if transfer_match_params[:method] == "new"
+        target_account = Current.family.accounts.find(transfer_match_params[:target_account_id])
+
+        missing_transaction = Transaction.new(
+          entry: target_account.entries.build(
+            amount: @entry.amount * -1,
+            currency: @entry.currency,
+            date: @entry.date,
+            name: "Transfer to #{@entry.amount.negative? ? @entry.account.name : target_account.name}",
+          )
+        )
+
+        transfer = Transfer.find_or_initialize_by(
+          inflow_transaction: @entry.amount.positive? ? missing_transaction : @entry.transaction,
+          outflow_transaction: @entry.amount.positive? ? @entry.transaction : missing_transaction
+        )
+        transfer.status = "confirmed"
+        transfer
+      else
+        target_transaction = Current.family.entries.find(transfer_match_params[:matched_entry_id])
+
+        transfer = Transfer.find_or_initialize_by(
+          inflow_transaction: @entry.amount.negative? ? @entry.transaction : target_transaction.transaction,
+          outflow_transaction: @entry.amount.negative? ? target_transaction.transaction : @entry.transaction
+        )
+        transfer.status = "confirmed"
+        transfer
+      end
+    end
+end