Determine searching state by params, not request

We may want to use GET for searching or POST to display a certain report
type.

app/controllers/spree/admin/reports_controller_decorator.rb

@@ -18,6 +18,7 @@ Spree::Admin::ReportsController.class_eval do
 
   include Spree::ReportsHelper
 
+  before_filter :cache_search_state
   # Fetches user's distributors, suppliers and order_cycles
   before_filter :load_data, only: [:customers, :products_and_inventory, :order_cycle_management, :packing]
 
@@ -220,10 +221,34 @@ Spree::Admin::ReportsController.class_eval do
 
   private
 
+  # Some actions are changing the `params` object. That is unfortunate Spree
+  # behavior and we are building on it. So we have to look at `params` early
+  # to check if we are searching or just displaying a report search form.
+  def cache_search_state
+    search_keys = [
+      # search parameter for ransack
+      :q,
+      # common in all reports, only set for CSV rendering
+      :csv,
+      # `button` is included in all forms. It's not important for searching,
+      # but the Users & Enterprises report doesn't have any other parameter
+      # for an empty search. So we use this one to display data.
+      :button,
+      # Some reports use filtering by enterprise or order cycle
+      :distributor_id,
+      :supplier_id,
+      :order_cycle_id,
+      # Xero Invoices can be filtered by date
+      :invoice_date,
+      :due_date
+    ]
+    @searching = search_keys.any? { |key| params.key? key }
+  end
+
   # We don't want to render data unless search params are supplied.
   # Compiling data can take a long time.
   def render_content?
-    request.post?
+    @searching
   end
 
   def render_report(header, table, create_csv, csv_file_name)

spec/controllers/spree/admin/reports_controller_spec.rb

@@ -70,7 +70,7 @@ describe Spree::Admin::ReportsController, type: :controller do
 
     describe 'Orders & Fulfillment' do
       it "shows all orders in order cycles I coordinate" do
-        spree_post :orders_and_fulfillment
+        spree_post :orders_and_fulfillment, {q: {}}
 
         expect(resulting_orders).to     include orderA1, orderA2
         expect(resulting_orders).not_to include orderB1, orderB2
@@ -98,7 +98,7 @@ describe Spree::Admin::ReportsController, type: :controller do
       let!(:present_objects) { [orderA1, orderA2, orderB1, orderB2] }
 
       it "only shows orders that I have access to" do
-        spree_post :bulk_coop
+        spree_post :bulk_coop, {q: {}}
 
         expect(resulting_orders).to     include(orderA1, orderB1)
         expect(resulting_orders).not_to include(orderA2)
@@ -123,7 +123,7 @@ describe Spree::Admin::ReportsController, type: :controller do
         let!(:present_objects) { [orderA1, orderA2, orderB1, orderB2] }
 
         it "only shows orders that I distribute" do
-          spree_post :orders_and_fulfillment
+          spree_post :orders_and_fulfillment, {q: {}}
 
           expect(resulting_orders).to     include orderA1, orderB1
           expect(resulting_orders).not_to include orderA2, orderB2
@@ -166,7 +166,7 @@ describe Spree::Admin::ReportsController, type: :controller do
         end
 
         it "only shows product line items that I am supplying" do
-          spree_post :bulk_coop
+          spree_post :bulk_coop, {q: {}}
 
           expect(resulting_products).to     include product1
           expect(resulting_products).not_to include product2, product3
@@ -191,7 +191,7 @@ describe Spree::Admin::ReportsController, type: :controller do
         end
 
         it "only shows product line items that I am supplying" do
-          spree_post :orders_and_fulfillment
+          spree_post :orders_and_fulfillment, {q: {}}
 
           expect(resulting_products).to     include product1
           expect(resulting_products).not_to include product2, product3
@@ -322,7 +322,7 @@ describe Spree::Admin::ReportsController, type: :controller do
       end
 
       it "shows report data" do
-        spree_post :users_and_enterprises
+        spree_post :users_and_enterprises, {q: {}}
         expect(assigns(:report).table.empty?).to be false
       end
     end