4 files changed, 3 insertions, 25 deletions
diff --git a/guides/source/active_record_callbacks.md b/guides/source/active_record_callbacks.md
index 666d987f8c..77bd3c97e8 100644
--- a/guides/source/active_record_callbacks.md
+++ b/guides/source/active_record_callbacks.md
@@ -288,7 +288,7 @@ Article destroyed
 Conditional Callbacks
 ---------------------
 
-As with validations, we can also make the calling of a callback method conditional on the satisfaction of a given predicate. We can do this using the `:if` and `:unless` options, which can take a symbol, a string, a `Proc` or an `Array`. You may use the `:if` option when you want to specify under which conditions the callback **should** be called. If you want to specify the conditions under which the callback **should not** be called, then you may use the `:unless` option.
+As with validations, we can also make the calling of a callback method conditional on the satisfaction of a given predicate. We can do this using the `:if` and `:unless` options, which can take a symbol, a `Proc` or an `Array`. You may use the `:if` option when you want to specify under which conditions the callback **should** be called. If you want to specify the conditions under which the callback **should not** be called, then you may use the `:unless` option.
 
 ### Using `:if` and `:unless` with a `Symbol`
 
@@ -300,16 +300,6 @@ class Order < ApplicationRecord
 end
 ```
 
-### Using `:if` and `:unless` with a String
-
-You can also use a string that will be evaluated using `eval` and hence needs to contain valid Ruby code. You should use this option only when the string represents a really short condition:
-
-```ruby
-class Order < ApplicationRecord
-  before_save :normalize_card_number, if: "paid_with_card?"
-end
-```
-
 ### Using `:if` and `:unless` with a `Proc`
 
 Finally, it is possible to associate `:if` and `:unless` with a `Proc` object. This option is best suited when writing short validation methods, usually one-liners:
diff --git a/guides/source/active_record_validations.md b/guides/source/active_record_validations.md
index 665e97c470..32b38cde5e 100644
--- a/guides/source/active_record_validations.md
+++ b/guides/source/active_record_validations.md
@@ -916,18 +916,6 @@ class Order < ApplicationRecord
 end
 ```
 
-### Using a String with `:if` and `:unless`
-
-You can also use a string that will be evaluated using `eval` and needs to
-contain valid Ruby code. You should use this option only when the string
-represents a really short condition.
-
-```ruby
-class Person < ApplicationRecord
-  validates :surname, presence: true, if: "name.nil?"
-end
-```
-
 ### Using a Proc with `:if` and `:unless`
 
 Finally, it's possible to associate `:if` and `:unless` with a `Proc` object
diff --git a/guides/source/engines.md b/guides/source/engines.md
index 0020112a1c..180a786237 100644
--- a/guides/source/engines.md
+++ b/guides/source/engines.md
@@ -59,7 +59,7 @@ only be enhancing it, rather than changing it drastically.
 To see demonstrations of other engines, check out
 [Devise](https://github.com/plataformatec/devise), an engine that provides
 authentication for its parent applications, or
-[Forem](https://github.com/radar/forem), an engine that provides forum
+[Thredded](https://github.com/thredded/thredded), an engine that provides forum
 functionality. There's also [Spree](https://github.com/spree/spree) which
 provides an e-commerce platform, and
 [RefineryCMS](https://github.com/refinery/refinerycms), a CMS engine.
diff --git a/guides/source/i18n.md b/guides/source/i18n.md
index 0b7cc055be..ed8cf8a344 100644
--- a/guides/source/i18n.md
+++ b/guides/source/i18n.md
@@ -417,7 +417,7 @@ If your translations are stored in YAML files, certain keys must be escaped. The
 Examples:
 
 ```erb
-# confing/locales/en.yml
+# config/locales/en.yml
 en:
   success:
     'true':  'True!'