feat: Custom fields in pre-chat form (#4135)

Fixes: #2744

db/migrate/20220309103742_add_custom_fields_to_pre_chat_form.rb

@@ -0,0 +1,28 @@
+class AddCustomFieldsToPreChatForm < ActiveRecord::Migration[6.1]
+  def change
+    Channel::WebWidget.find_in_batches do |channels_batch|
+      channels_batch.each do |channel|
+        pre_chat_message = channel[:pre_chat_form_options]['pre_chat_message'] || 'Share your queries or comments here.'
+        pre_chat_fields = pre_chat_fields?(channel)
+        channel[:pre_chat_form_options] = {
+          'pre_chat_message': pre_chat_message,
+          'pre_chat_fields': pre_chat_fields
+        }
+        channel.save!
+      end
+    end
+  end
+
+  def pre_chat_fields?(channel)
+    email_enabled = channel[:pre_chat_form_options]['require_email'] || false
+    [
+      {
+        'label': 'Email Id', 'name': 'emailAddress', 'type': 'email', 'required': true, 'enabled': email_enabled
+      }, {
+        'label': 'Full name', 'name': 'fullName', 'type': 'text', 'required': true, 'enabled': email_enabled
+      }, {
+        'label': 'Phone number', 'name': 'phoneNumber', 'type': 'number', 'required': true, 'enabled': false
+      }
+    ]
+  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: 2022_02_18_120357) do
+ActiveRecord::Schema.define(version: 2022_03_09_103742) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_stat_statements"