Add support for Airtable

app/models/form.rb

@@ -1,15 +1,21 @@
-require 'google/apis/sheets_v4'
 class Form < ApplicationRecord
-  # Hash to translate an index to a A1 notation. e.g. 1 => 'B', 27 => 'AA'
-  COLUMN_INDEX_TO_LETTER = Hash.new {|hash,key| hash[key] = hash[key - 1].next }.merge({0 => "A"})
-
   belongs_to :user
   has_many :submissions, dependent: :destroy
+
+  before_validation :insert_defaults, on: :create
   after_create :create_spreadsheet
 
   has_secure_token
 
+  encrypts :airtable_api_key
+  encrypts :airtable_app_key
+
   validates_presence_of :title
+  validates_inclusion_of :backend_name, in: ['google_sheets', 'airtable']
+  # Airtable validations
+  validates_presence_of :airtable_api_key, if: :airtable?
+  validates_presence_of :airtable_app_key, if: :airtable?
+  validates_presence_of :airtable_table, if: :airtable?
 
   # TODO: use counter_cache option on association
   def submissions_count
@@ -28,63 +34,39 @@ class Form < ApplicationRecord
     self.user.active?
   end
 
-  def google_spreadsheet_url
-    "https://docs.google.com/spreadsheets/d/#{google_spreadsheet_id}/edit" if google_spreadsheet_id.present?
+  def airtable?
+    backend_name == 'airtable'
+  end
+
+  def google
+    backend_name == 'google'
+  end
+
+  def backend
+    @backend ||= SpreadsheetBackends.const_get(backend_name.camelize).new(self)
+  end
+
+  def spreadsheet_url
+    backend.url
   end
 
   def create_spreadsheet
-    sheets = Google::Apis::SheetsV4::SheetsService.new
-    sheets.authorization = user.google_authorization
-    create_object = Google::Apis::SheetsV4::Spreadsheet.new(properties: { title: title})
-    spreadsheet = sheets.create_spreadsheet(create_object)
-    update(google_spreadsheet_id: spreadsheet.spreadsheet_id)
+    backend.create
   end
 
-  def spreadsheet_service
-    @spreadsheet_service ||= Google::Apis::SheetsV4::SheetsService.new.tap do |s|
-      s.authorization = user.google_authorization
-    end
+  def append_to_spreadsheet(data)
+    backend.append(data)
   end
 
-  def header_values
-    @header_values ||= begin
-                         values = spreadsheet_service.get_spreadsheet_values(google_spreadsheet_id, 'A1:An').values
-                         # if there are no headers yet, return an empty array
-                         if values
-                          values[0].map(&:strip)
-                         else
-                           []
-                         end
-                       end
-  end
-
-  def append(data)
-    data = data.with_indifferent_access
-    check_spreadsheed_headers!(data)
-
-    values = header_values.map { |key| data[key] }
-    range = "A1:A#{COLUMN_INDEX_TO_LETTER[values.length]}1"
-    value_range = Google::Apis::SheetsV4::ValueRange.new(values: [values], major_dimension: 'ROWS')
-
-    spreadsheet_service.append_spreadsheet_value(google_spreadsheet_id, range, value_range, value_input_option: 'USER_ENTERED')
-  end
-
-  def check_spreadsheed_headers!(data)
-    missing_headers = data.keys.map { |k| k.to_s.strip } - header_values
-    append_missing_headers(missing_headers) unless missing_headers.empty?
-  end
-
-  def append_missing_headers(missing_headers)
-    start_column = COLUMN_INDEX_TO_LETTER[header_values.length]
-    end_column = COLUMN_INDEX_TO_LETTER[header_values.length + missing_headers.length]
-    range = "#{start_column}1:#{end_column}1"
-    value_range = Google::Apis::SheetsV4::ValueRange.new(values: [missing_headers], major_dimension: 'ROWS')
-    spreadsheet_service.update_spreadsheet_value(google_spreadsheet_id, range, value_range, value_input_option: 'USER_ENTERED')
-    @header_values = nil # reset header values to refresh memoization on next access
+  def spreadsheet_headers
+    backend.headers
   end
 
   def to_param
     token
   end
 
+  def insert_defaults
+    self.backend_name ||= airtable_app_key.present? ? 'airtable' : 'google_sheets'
+  end
 end

app/models/submission.rb

@@ -44,7 +44,7 @@ class Submission < ApplicationRecord
   end
 
   def append_to_spreadsheet
-    result = form.append(data)
-    update_column(:appended_at, Time.current) if result.updates.updated_rows > 0
+    form.append_to_spreadsheet(data) &&
+      update_column(:appended_at, Time.current)
   end
 end

app/views/forms/index.html.erb

@@ -25,7 +25,7 @@
               </div>
               <div class="media-right has-text-right is-size-4">
                 <figure class="image is-48x48 ">
-                  <%= link_to form.google_spreadsheet_url, {class: "has-text-success", target: "__blank"} do %>
+                  <%= link_to form.spreadsheet_url, {class: "has-text-success", target: "__blank"} do %>
                   <i class="far fa-file-excel"></i>
                   <% end %>
                 </figure>

app/views/forms/show.html.erb

@@ -3,12 +3,12 @@
   <%= submission_url(@form) %>
 </p>
 <p>
-  <%= link_to 'Google spreadsheet', @form.google_spreadsheet_url %>
+  <%= link_to 'Google spreadsheet', @form.spreadsheet_url %>
 </p>
 <table>
   <thead>
     <tr>
-      <% @form.header_values.each do |value| %>
+      <% @form.spreadsheet_headers.each do |value| %>
         <th><%= value %></th>
       <% end %>
     </tr>
@@ -16,7 +16,7 @@
   <tbody>
     <% @submissions.each do |submission| %>
       <tr>
-        <% @form.header_values.each do |column| %>
+        <% @form.spreadsheet_headers.each do |column| %>
           <td><%= submission.data[column] %></td>
         <% end %>
       </tr>

app/views/home/demo.html.erb

@@ -6,7 +6,7 @@
           <input type="hidden" name="ID" value="tinyforms_id">
           <h3>Demo</h3>
           <p>
-            This short form is connected to the embedded <%= link_to 'document', DEMO_FORM.google_spreadsheet_url %> on the right. <br>
+            This short form is connected to the embedded <%= link_to 'document', DEMO_FORM.spreadsheet_url %> on the right. <br>
             Submit the form and see the update of the document in realtime.
           </p>
 
@@ -80,7 +80,7 @@
 
       <div class="column">
         <iframe id="demo-sheet" style="width:100%;height:100%;" src="https://docs.google.com/spreadsheets/d/<%= DEMO_FORM.google_spreadsheet_id %>/edit?usp=sharing&nocache=<%= Time.now.to_i %>#gid=0&range=<%= DEMO_FORM.submissions.count + 1 %>:<%= DEMO_FORM.submissions.count + 2 %>"></iframe>
-        <p class="has-text-grey has-text-centered">Document not loading? <%= link_to 'Open it here', DEMO_FORM.google_spreadsheet_url %>.</p>
+        <p class="has-text-grey has-text-centered">Document not loading? <%= link_to 'Open it here', DEMO_FORM.spreadsheet_url %>.</p>
       </div>
     </div>
   </div>