Regexp validator now supports allow_blank, nil value behavior changed.

CHANGELOG.md

@@ -1,13 +1,13 @@
-0.11.1 (Next)
+0.12.0 (Next)
 =============
 
 #### Fixes
 
 * [#936](https://github.com/intridea/grape/pull/936): Fixed default params processing for optional groups - [@dm1try](https://github.com/dm1try).
 * [#942](https://github.com/intridea/grape/pull/942): Fixed forced presence for optional params when based on a reused entity that was also required in another context - [@croeck](https://github.com/croeck).
-* [#950](https://github.com/intridea/grape/pull/950): Status method can now accept one of Rack::Utils status code symbols (:ok, :found, :bad_request, etc.). - [@dabrorius](https://github.com/dabrorius).
-* [#952](https://github.com/intridea/grape/pull/952): Status method now raises error when called with invalid status code. - [@dabrorius](https://github.com/dabrorius).
-
+* [#950](https://github.com/intridea/grape/pull/950): Status method can now accept one of Rack::Utils status code symbols (:ok, :found, :bad_request, etc.) - [@dabrorius](https://github.com/dabrorius).
+* [#952](https://github.com/intridea/grape/pull/952): Status method now raises error when called with invalid status code - [@dabrorius](https://github.com/dabrorius).
+* [#957](https://github.com/intridea/grape/pull/957): Regexp validator now supports `allow_blank`, `nil` value behavior changed - [@calfzhou](https://giihub.com/calfzhou).
 * Your contribution here.
 
 0.11.0 (2/23/2015)

README.md

@@ -820,7 +820,7 @@ end
 #### `regexp`
 
 Parameters can be restricted to match a specific regular expression with the `:regexp` option. If the value
-is nil or does not match the regular expression an error will be returned. Note that this is true for both `requires`
+does not match the regular expression an error will be returned. Note that this is true for both `requires`
 and `optional` parameters.
 
 ```ruby
@@ -829,6 +829,13 @@ params do
 end
 ```
 
+The validator will pass if the parameter was sent without value. To ensure that the parameter contains a value, use `allow_blank: false`.
+
+```ruby
+params do
+  requires :email, allow_blank: false, regexp: /.+@.+/
+end
+```
 
 #### `mutually_exclusive`
 

UPGRADING.md

@@ -1,9 +1,23 @@
 Upgrading Grape
 ===============
 
+### Upgrading to >= 0.12.0
+
+#### Changes to regexp validator
+
+Parameters with `nil` value will now pass `regexp` validation. To disallow `nil` value for an endpoint, add `allow_blank: false`.
+
+```ruby
+params do
+  requires :email, allow_blank: false, regexp: /.+@.+/
+end
+```
+
+See [#957](https://github.com/intridea/grape/pull/957) for more information.
+
 ### Upgrading to >= 0.11.0
 
-#### Added Rack 1.6.0 Support
+#### Added Rack 1.6.0 support
 
 Grape now supports, but doesn't require Rack 1.6.0. If you encounter an issue with parsing requests larger than 128KB, explictly require Rack 1.6.0 in your Gemfile.
 

lib/grape/validations/validators/regexp.rb

@@ -3,7 +3,7 @@ module Validations
     class RegexpValidator < Base
       def validate_param!(attr_name, params)
         if params.key?(attr_name) &&
-           (params[attr_name].nil? || !(params[attr_name].to_s =~ @option))
+           !params[attr_name].nil? && !(params[attr_name].to_s =~ @option)
           fail Grape::Exceptions::Validation, params: [@scope.full_name(attr_name)], message_key: :regexp
         end
       end

spec/grape/validations/validators/presence_spec.rb

@@ -55,7 +55,7 @@ def app
   context 'with a required non-empty string' do
     before do
       subject.params do
-        requires :email, type: String, regexp: /^\S+$/
+        requires :email, type: String, allow_blank: false, regexp: /^\S+$/
       end
       subject.get do
         'Hello'
@@ -64,12 +64,12 @@ def app
     it 'requires when missing' do
       get '/'
       expect(last_response.status).to eq(400)
-      expect(last_response.body).to eq('{"error":"email is missing, email is invalid"}')
+      expect(last_response.body).to eq('{"error":"email is missing, email is empty"}')
     end
     it 'requires when empty' do
       get '/', email: ''
       expect(last_response.status).to eq(400)
-      expect(last_response.body).to eq('{"error":"email is invalid"}')
+      expect(last_response.body).to eq('{"error":"email is empty, email is invalid"}')
     end
     it 'valid when set' do
       get '/', email: '[email protected]'

spec/grape/validations/validators/regexp_spec.rb

@@ -25,12 +25,17 @@ def app
       expect(last_response.status).to eq(400)
     end
 
-    it 'refuses nil' do
-      get '/', name: nil
+    it 'refuses empty' do
+      get '/', name: ''
       expect(last_response.status).to eq(400)
     end
   end
 
+  it 'accepts nil' do
+    get '/', name: nil
+    expect(last_response.status).to eq(200)
+  end
+
   it 'accepts valid input' do
     get '/', name: 'bob'
     expect(last_response.status).to eq(200)