Initial commit

services/minimal-validation/validator.rb

@@ -0,0 +1,59 @@
+module MinimalValidator
+  class Validator
+    def initialize
+      reset
+    end
+
+    def reset
+      self.errors = {}
+    end
+
+    def valid?
+      errors.empty?
+    end
+
+    def validate_presence_of(attributes)
+      attributes.each do |attribute, value|
+        if (value.nil? || value.empty?)
+          errors.store(attribute.to_sym, "can't be blank")
+        end
+      end
+    end
+
+    def validate_presence_of_with_custom_message(attributes, custom_message)
+      has_errors = false
+      error_attribute = nil
+      attributes.each do |attribute, value|
+        if (value.nil? || value.empty?)
+          error_attribute = attribute
+          has_errors = true
+        end
+      end
+      errors.store(error_attribute.to_sym, custom_message) if has_errors
+    end
+
+    def validate_available_name
+      return self unless name_changed && user
+    end
+
+    def validate_in(attribute, value, whitelist)
+      unless whitelist.include?(value)
+        errors.store(attribute, "must be one of #{whitelist.join(', ')}")
+      end
+    end
+
+    def validate_uniqueness_of(attribute, available)
+      self.errors.store(attribute.to_sym, 'is already taken') unless available
+    end
+
+    def validate_expected_value(attribute, expected_value, actual_value)
+      self.errors.store(attribute.to_sym, 'has invalid value') unless actual_value == expected_value
+    end
+
+    def full_errors
+      errors.map { |attribute, message| "#{attribute} #{message}" }
+    end
+
+    attr_accessor :errors
+  end
+end