[#4390] Added a Contract filter to the issues list.

lib/redmine_contracts/patches/query_patch.rb

@@ -9,6 +9,9 @@ module RedmineContracts
           unloadable
 
           alias_method_chain :available_filters, :deliverable
+          alias_method_chain :available_filters, :contract
+
+          alias_method_chain :sql_for_field, :contract
         end
       end
 
@@ -34,6 +37,52 @@ module RedmineContracts
           end
 
         end
+
+        # TODO: Should have an API on the Redmine core for this
+        def available_filters_with_contract
+          @available_filters = available_filters_without_contract
+
+          if project
+            contract_filters = {
+              "contract_id" => {
+                :type => :list_optional,
+                :order => 16,
+                :values => project.contracts.by_name.collect { |d| [d.name, d.id.to_s] }
+              }
+            }
+            return @available_filters.merge(contract_filters)
+          else
+            return @available_filters
+          end
+
+        end
+
+        def sql_for_field_with_contract(field, operator, value, db_table, db_field, is_custom_filter=false)
+          if field != "contract_id"
+            return sql_for_field_without_contract(field, operator, value, db_table, db_field, is_custom_filter)
+          else
+            # Contracts > Deliverables > Issue
+            case operator
+            when "="
+              contracts = value.collect{|val| "'#{connection.quote_string(val)}'"}.join(",")
+              inner_select = "(SELECT id from deliverables where deliverables.contract_id IN (#{contracts}))"
+              sql = "#{Issue.table_name}.deliverable_id IN (#{inner_select})"
+            when "!"
+              contracts = value.collect{|val| "'#{connection.quote_string(val)}'"}.join(",")
+              inner_select = "(SELECT id from deliverables where deliverables.contract_id IN (#{contracts}))"
+              sql = "(#{Issue.table_name}.deliverable_id IS NULL OR #{Issue.table_name}.deliverable_id NOT IN (#{inner_select}))"
+            when "!*"
+              # If it doesn't have a deliverable, it can't have a contract
+              sql = "#{Issue.table_name}.deliverable_id IS NULL"
+            when "*"
+              # If it has a deliverable, it must have a contract
+              sql = "#{Issue.table_name}.deliverable_id IS NOT NULL"
+            end
+
+            return sql
+          end
+        end
+
       end
     end
   end