Basic donation records

Adds donation model/table and basic manual management in the admin
panel, as well as basic listing of users' own donations.

app/controllers/admin/donations_controller.rb

@@ -0,0 +1,74 @@
+class Admin::DonationsController < Admin::BaseController
+  before_action :set_donation, only: [:show, :edit, :update, :destroy]
+
+  # GET /donations
+  # GET /donations.json
+  def index
+    @donations = Donation.all
+  end
+
+  # GET /donations/1
+  # GET /donations/1.json
+  def show
+  end
+
+  # GET /donations/new
+  def new
+    @donation = Donation.new
+  end
+
+  # GET /donations/1/edit
+  def edit
+  end
+
+  # POST /donations
+  # POST /donations.json
+  def create
+    @donation = Donation.new(donation_params)
+
+    respond_to do |format|
+      if @donation.save
+        format.html { redirect_to admin_donation_url(@donation), notice: 'Donation was successfully created.' }
+        format.json { render :show, status: :created, location: @donation }
+      else
+        format.html { render :new }
+        format.json { render json: @donation.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # PATCH/PUT /donations/1
+  # PATCH/PUT /donations/1.json
+  def update
+    respond_to do |format|
+      if @donation.update(donation_params)
+        format.html { redirect_to admin_donation_url(@donation), notice: 'Donation was successfully updated.' }
+        format.json { render :show, status: :ok, location: @donation }
+      else
+        format.html { render :edit }
+        format.json { render json: @donation.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # DELETE /donations/1
+  # DELETE /donations/1.json
+  def destroy
+    @donation.destroy
+    respond_to do |format|
+      format.html { redirect_to admin_donations_url, notice: 'Donation was successfully destroyed.' }
+      format.json { head :no_content }
+    end
+  end
+
+  private
+    # Use callbacks to share common setup or constraints between actions.
+    def set_donation
+      @donation = Donation.find(params[:id])
+    end
+
+    # Only allow a list of trusted parameters through.
+    def donation_params
+      params.require(:donation).permit(:user_id, :amount_sats, :amount_eur, :amount_usd, :public_name)
+    end
+end