Add support for case-insensitve LIKE and LIKE_EXPANDED search

README.md

@@ -163,6 +163,31 @@ and the following query in `LIKE_EXPANDED` mode given the search string "John Sm
 SELECT * FROM `customers` WHERE (`id` LIKE '%John%' OR `id` LIKE '%Smith%' OR `first_name` LIKE '%John%' OR `first_name` LIKE '%Smith%' OR `last_name` LIKE '%John%' OR `last_name` LIKE '%Smith%')
 ```
 
+### LIKE_CASE_INSENSITIVE and LIKE_EXPANDED_CASE_INSENSITIVE Modes
+
+`LIKE_CASE_INSENSITIVE` and `LIKE_EXPANDED_CASE_INSENSITIVE` modes are similar to `LIKE` and `LIKE_EXPANDED` modes except they will force both the field and parameter to lowercase in order 
+to perform a case-insensitive search. Note that you do not need to use this if you are already using a case-insensitive collation.
+
+For example running a search on a `Customer` model with the following database structure:
+
+| column name | type             |
+|-------------|------------------|
+| id          | int(10) UN AI PK |
+| first_name  | VARCHAR(255)     |
+| last_name   | VARCHAR(255)     |
+
+would produce the following query in `LIKE_CASE_INSENSITIVE` mode given the search string "John":
+
+```sql
+SELECT * FROM `customers` WHERE (LCASE(`id`) LIKE LOWER('%John%') OR LCASE(`first_name`) LIKE LOWER('%John%') OR LCASE(`last_name`) LIKE LOWER('%JOHN%'))
+```
+
+and the following query in `LIKE_EXPANDED_CASE_INSENSITIVE` mode given the search string "John Smith":
+
+```sql
+SELECT * FROM `customers` WHERE (LCASE(`id`) LIKE LOWER('%John%') OR LCASE(`id`) LIKE LOWER('%Smith%') OR LCASE(`first_name`) LIKE LOWER('%John%') OR LCASE(`first_name`) LIKE LOWER('%Smith%') OR LCASE(`last_name`) LIKE LOWER('%John%') OR LCASE(`last_name`) LIKE LOWER('%Smith%'))
+```
+
 Console Command <div id="console-command"></div>
 ---------------
 

src/Engines/Modes/LikeCaseInsensitive.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Yab\MySQLScout\Engines\Modes;
+
+use Laravel\Scout\Builder;
+use Yab\MySQLScout\Services\ModelService;
+
+class LikeCaseInsensitive extends Mode
+{
+    protected $fields;
+
+    public function buildWhereRawString(Builder $builder)
+    {
+        $queryString = '';
+
+        $this->fields = $this->modelService->setModel($builder->model)->getSearchableFields();
+
+        $queryString .= $this->buildWheres($builder);
+
+        $queryString .= '(';
+
+        foreach ($this->fields as $field) {
+            $queryString .= "LCASE(`$field`) LIKE LOWER(?) OR ";
+        }
+
+        $queryString = trim($queryString, 'OR ');
+        $queryString .= ')';
+
+        return $queryString;
+    }
+
+    public function buildParams(Builder $builder)
+    {
+        for ($itr = 0; $itr < count($this->fields); ++$itr) {
+            $this->whereParams[] = '%'.$builder->query.'%';
+        }
+
+        return $this->whereParams;
+    }
+
+    public function isFullText()
+    {
+        return false;
+    }
+}

src/Engines/Modes/LikeExpandedCaseInsensitive.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace Yab\MySQLScout\Engines\Modes;
+
+use Laravel\Scout\Builder;
+use Yab\MySQLScout\Services\ModelService;
+
+class LikeExpandedCaseInsensitive extends Mode
+{
+    protected $fields;
+
+    public function buildWhereRawString(Builder $builder)
+    {
+        $queryString = '';
+
+        $this->fields = $this->modelService->setModel($builder->model)->getSearchableFields();
+
+        $queryString .= $this->buildWheres($builder);
+
+        $words = explode(' ', $builder->query);
+
+        $queryString .= '(';
+
+        foreach ($this->fields as $field) {
+            foreach ($words as $word) {
+                $queryString .= "LCASE(`$field`) LIKE LOWER(?) OR ";
+            }
+        }
+
+        $queryString = trim($queryString, 'OR ');
+        $queryString .= ')';
+
+        return $queryString;
+    }
+
+    public function buildParams(Builder $builder)
+    {
+        $words = explode(' ', $builder->query);
+
+        for ($i = 0; $i < count($this->fields); ++$i) {
+            foreach ($words as $word) {
+                $this->whereParams[] = '%'.$word.'%';
+            }
+        }
+
+        return $this->whereParams;
+    }
+
+    public function isFullText()
+    {
+        return false;
+    }
+}