Make tag search case insensitive again (#4184)

app/models/tag.rb

@@ -23,7 +23,7 @@ class Tag < ApplicationRecord
   class << self
     def search_for(term, limit = 5)
       pattern = sanitize_sql_like(term) + '%'
-      Tag.where('name like ?', pattern).order(:name).limit(limit)
+      Tag.where('lower(name) like lower(?)', pattern).order(:name).limit(limit)
     end
   end
 end

db/migrate/20170713112503_make_tag_search_case_insensitive.rb

@@ -0,0 +1,11 @@
+class MakeTagSearchCaseInsensitive < ActiveRecord::Migration[5.1]
+  def up
+    remove_index :tags, name: :hashtag_search_index
+    execute 'CREATE INDEX hashtag_search_index ON tags (lower(name) text_pattern_ops);'
+  end
+
+  def down
+    remove_index :tags, name: :hashtag_search_index
+    execute 'CREATE INDEX hashtag_search_index ON tags (name text_pattern_ops);'
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170711225116) do
+ActiveRecord::Schema.define(version: 20170713112503) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -332,7 +332,7 @@ ActiveRecord::Schema.define(version: 20170711225116) do
     t.string "name", default: "", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
-    t.index "name text_pattern_ops", name: "hashtag_search_index"
+    t.index "lower((name)::text) text_pattern_ops", name: "hashtag_search_index"
     t.index ["name"], name: "index_tags_on_name", unique: true
   end
 

spec/models/tag_spec.rb

@@ -27,6 +27,15 @@ RSpec.describe Tag, type: :model do
       expect(results).to eq [tag]
     end
 
+    it 'finds tag records in case insensitive' do
+      tag = Fabricate(:tag, name: "MATCH")
+      _miss_tag = Fabricate(:tag, name: "miss")
+
+      results = Tag.search_for("match")
+
+      expect(results).to eq [tag]
+    end
+
     it 'finds the exact matching tag as the first item' do
       similar_tag = Fabricate(:tag, name: "matchlater")
       tag = Fabricate(:tag, name: "match")