Adding support for unit field in structured search. If libpostal finds it in input use it for searching

controller/structured_libpostal.js

@@ -3,19 +3,20 @@ const Debug = require('../helper/debug');
 const debugLog = new Debug('controller:libpostal');
 const logger = require('pelias-logger').get('api');
 
-// if there's a house_number in the libpostal response, return it
-// otherwise return the postcode field (which may be undefined)
-function findHouseNumberField(response) {
-  const house_number_field = response.find(f => f.label === 'house_number');
-
-  if (house_number_field) {
-    return house_number_field;
+// Find field in libpostal response 
+function findField(response, field, replacementField) {
+  const libpostalField = response.find(f => f.label === field);
+
+  if (libpostalField) {
+    return libpostalField;
+  } else if(replacementField) {
+    return response.find(f => f.label === replacementField);
+  } else {
+    return;
   }
-
-  return response.find(f => f.label === 'postcode');
-
 }
 
+
 function setup(libpostalService, should_execute) {
   function controller( req, res, next ){
     // bail early if req/res don't pass conditions for execution
@@ -35,7 +36,9 @@ function setup(libpostalService, should_execute) {
         // libpostal parses some inputs, like `3370 cobbe ave`, as a postcode+street
         // so because we're treating the entire field as a street address, it's safe
         // to assume that an identified postcode is actually a house number.
-        const house_number_field = findHouseNumberField(response);
+        // if there's a house_number in the libpostal response, return it
+        // otherwise return the postcode field (which may be undefined)
+        const house_number_field = findField(response, 'house_number', 'postcode');
 
         // if we're fairly certain that libpostal identified a house number
         // (from either the house_number or postcode field), place it into the
@@ -48,6 +51,14 @@ function setup(libpostalService, should_execute) {
           // remove the first instance of the number and trim whitespace
           req.clean.parsed_text.street = _.trim(_.replace(req.clean.parsed_text.address, req.clean.parsed_text.number, ''));
 
+          // If libpostal have parsed unit then add it for search
+          const unit_field = findField(response, 'unit');
+          if(unit_field) {
+            req.clean.parsed_text.unit = unit_field.value;
+            // Removing unit from street and trim
+            req.clean.parsed_text.street = _.trim(_.replace(req.clean.parsed_text.street, req.clean.parsed_text.unit, ''));
+          }
+
         } else {
           // otherwise no house number was identifiable, so treat the entire input
           // as a street

test/unit/controller/structured_libpostal.js

@@ -291,6 +291,55 @@ module.exports.tests.success_conditions = (test, common) => {
 
   });
 
+  test('service returning house_number and unit should set req.clean.parsed_text.unit', t => {
+    const service = (req, callback) => {
+      const response = [
+        {
+          label: 'road',
+          value: 'the street'
+        },
+        {
+          label: 'house_number',
+          value: '22'
+        },
+        {
+          label: 'unit',
+          value: '1 th'
+        }
+      ];
+
+      callback(null, response);
+    };
+
+    const controller = libpostal(service, () => true);
+
+    const req = {
+      clean: {
+        parsed_text: {
+          address: 'the street 22 1 th'
+        }
+      },
+      errors: []
+    };
+
+    controller(req, undefined, () => {
+      t.deepEquals(req, {
+        clean: {
+          parsed_text: {
+            street: 'the street',
+            number: '22',
+            unit: '1 th'
+          }
+        },
+        errors: []
+      }, 'req should have been modified');
+
+      t.end();
+
+    });
+
+  });
+
   // test('service returning valid response should convert and append', t => {
   //   const service = (req, callback) => {
   //     const response = [