Set maximum number of documents on proposal and budget investments. Show alert on documents tab when maximum reached. Hide upload button when maximum reached.

app/models/budget/investment.rb

@@ -1,6 +1,5 @@
 class Budget
   class Investment < ActiveRecord::Base
-
     include Measurable
     include Sanitizable
     include Taggable
@@ -13,6 +12,8 @@ class Budget
     acts_as_paranoid column: :hidden_at
     include ActsAsParanoidAliases
 
+    MAX_DOCUMENTS_SIZE = 3
+    
     belongs_to :author, -> { with_hidden }, class_name: 'User', foreign_key: 'author_id'
     belongs_to :heading
     belongs_to :group

app/models/proposal.rb

@@ -15,6 +15,7 @@ class Proposal < ActiveRecord::Base
   acts_as_paranoid column: :hidden_at
   include ActsAsParanoidAliases
 
+  MAX_DOCUMENTS_SIZE = 3
   RETIRE_OPTIONS = %w(duplicated started unfeasible done other)
 
   belongs_to :author, -> { with_hidden }, class_name: 'User', foreign_key: 'author_id'

app/views/budgets/investments/_investment_show.html.erb

@@ -4,7 +4,7 @@
     <div class="small-12 medium-9 column">
       <%= back_link_to budget_investments_path(investment.budget, heading_id: investment.heading) %>
 
-      <% if can? :create, @document %>
+      <% if can?(:create, @document) && investment.documents.size < Budget::Investment::MAX_DOCUMENTS_SIZE %>
         <%= link_to t("documents.upload_document"),
                     new_document_path(documentable_id:investment, documentable_type: investment.class.name, from: request.url),
                     class: 'button hollow float-right' %>

app/views/budgets/investments/show.html.erb

@@ -21,7 +21,9 @@
   </div>
 
   <div class="tabs-panel" id="tab-documents">
-    <%= render 'documents/documents', documents: @investment.documents %>
+    <%= render 'documents/documents',
+                documents: @investment.documents,
+                max_documents_size: Budget::Investment::MAX_DOCUMENTS_SIZE %>
   </div>
 
 </div>

app/views/documents/_documents.html.erb

@@ -1,4 +1,15 @@
 <% if documents.any? %>
+
+  <% if documents.size == max_documents_size %>
+    <div class="row documents-list">
+      <div class="small-12 column">
+        <div class="callout primary text-center">
+          <%= t "documents.max_documents_size_reached" %>
+        </div>
+      </div>
+    </div>
+  <% end %>
+
   <div class="row documents-list">
     <div class="small-12 column">
       <table>
@@ -10,7 +21,9 @@
       </table>
     </div>
   </div>
+
 <% else %>
+
   <div class="row">
     <div class="small-12 column">
       <div class="callout primary text-center">
@@ -18,4 +31,5 @@
       </div>
     </div>
   </div>
+
 <% end %>

app/views/proposals/show.html.erb

@@ -16,7 +16,7 @@
       <div class="small-12 medium-9 column">
         <%= back_link_to %>
 
-        <% if can? :create, @document %>
+        <% if can?(:create, @document) && @proposal.documents.size < Proposal::MAX_DOCUMENTS_SIZE %>
           <%= link_to t("documents.upload_document"),
                       new_document_path(documentable_id: @proposal, documentable_type: @proposal.class.name, from: request.url),
                       class: 'button hollow float-right' %>
@@ -164,6 +164,8 @@
   </div>
 
   <div class="tabs-panel" id="tab-documents">
-    <%= render 'documents/documents', documents: @proposal.documents %>
+    <%= render 'documents/documents',
+                documents: @proposal.documents,
+                max_documents_size: Proposal::MAX_DOCUMENTS_SIZE %>
   </div>
 </div>