diff --git a/app/models/unit.rb b/app/models/unit.rb
index c40753c..d10de22 100644
--- a/app/models/unit.rb
+++ b/app/models/unit.rb
@@ -10,8 +10,8 @@ class Unit < ApplicationRecord
     errors.add(:base, :multilevel_nesting) if base.base.present?
   end
   validates :symbol, presence: true, uniqueness: {scope: :user_id},
-    length: {maximum: columns_hash['symbol'].limit}
-  validates :description, length: {maximum: columns_hash['description'].limit}
+    length: {maximum: type_for_attribute(:symbol).limit}
+  validates :description, length: {maximum: type_for_attribute(:description).limit}
   validates :multiplier, numericality: {equal_to: 1}, unless: :base
   validates :multiplier, numericality: {other_than: 0, precision: true, scale: true}, if: :base
 
diff --git a/app/models/user.rb b/app/models/user.rb
index e929c59..35f8c76 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -14,8 +14,8 @@ class User < ApplicationRecord
   has_many :units, dependent: :destroy
 
   validates :email, presence: true, uniqueness: true,
-    length: {maximum: columns_hash['email'].limit}
-  validates :unconfirmed_email, length: {maximum: columns_hash['unconfirmed_email'].limit}
+    length: {maximum: type_for_attribute(:email).limit}
+  validates :unconfirmed_email, length: {maximum: type_for_attribute(:unconfirmed_email).limit}
 
   def to_s
     email
diff --git a/app/views/units/_form.html.erb b/app/views/units/_form.html.erb
index cc77f6a..f59b3a8 100644
--- a/app/views/units/_form.html.erb
+++ b/app/views/units/_form.html.erb
@@ -4,11 +4,11 @@
 
     <td class="<%= class_names({subunit: @unit.base}) %>">
       <%= form.text_field :symbol, form: :unit_form, required: true, autofocus: true, size: 12,
-        maxlength: @unit.class.columns_hash['symbol'].limit, autocomplete: "off" %>
+        maxlength: @unit.class.type_for_attribute(:symbol).limit, autocomplete: "off" %>
     </td>
     <td>
       <%= form.text_area :description, form: :unit_form, cols: 30, rows: 1, escape: false,
-        maxlength: @unit.class.columns_hash['description'].limit, autocomplete: "off" %>
+        maxlength: @unit.class.type_for_attribute(:description).limit, autocomplete: "off" %>
     </td>
     <td>
       <% unless @unit.base.nil? %>