add unless conditional support

.idea/.gitignore

@@ -0,0 +1,2 @@
+# Default ignored files
+/workspace.xml

.idea/inspectionProfiles/Project_Default.xml

@@ -0,0 +1,6 @@
+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="Rubocop" enabled="false" level="WARNING" enabled_by_default="false" />
+  </profile>
+</component>

.idea/jsonapi-serializer.iml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="RUBY_MODULE" version="4">
+  <component name="ModuleRunConfigurationManager">
+    <shared />
+  </component>
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/features" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/spec" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" scope="PROVIDED" name="bundler (v1.17.2, ruby-2.6.3-p62) [gem]" level="application" />
+    <orderEntry type="library" scope="PROVIDED" name="rake (v12.3.2, ruby-2.6.3-p62) [gem]" level="application" />
+    <orderEntry type="library" scope="PROVIDED" name="sqlite3 (v1.3.13, ruby-2.6.3-p62) [gem]" level="application" />
+  </component>
+</module>

.idea/misc.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptSettings">
+    <option name="languageLevel" value="ES6" />
+  </component>
+  <component name="ProjectRootManager" version="2" project-jdk-name="ruby-2.6.3-p62" project-jdk-type="RUBY_SDK" />
+</project>

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/jsonapi-serializer.iml" filepath="$PROJECT_DIR$/.idea/jsonapi-serializer.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

lib/fast_jsonapi/conditional.rb

@@ -0,0 +1,30 @@
+module FastJsonapi
+  class Conditional
+    CONDITIONAL_KEYS = %i[if unless].freeze
+
+    def initialize(conditional_params)
+      @if_condition = conditional_params[:if]
+      @unless_condition = conditional_params[:unless]
+    end
+
+    def allowed?(record:, serialization_params:)
+      if_allowed?(record, serialization_params) && unless_allowed?(record, serialization_params)
+    end
+
+    private
+
+    attr_reader :if_condition, :unless_condition
+
+    def if_allowed?(record, serialization_params)
+      if_condition.present? ? check_condition?(if_condition, record, serialization_params) : true
+    end
+
+    def unless_allowed?(record, serialization_params)
+      unless_condition.present? ? !check_condition?(unless_condition, record, serialization_params) : true
+    end
+
+    def check_condition?(condition, record, serialization_params)
+      FastJsonapi.call_proc(condition, record, serialization_params)
+    end
+  end
+end

lib/fast_jsonapi/object_serializer.rb

@@ -4,10 +4,11 @@ require 'active_support/time'
 require 'active_support/concern'
 require 'active_support/inflector'
 require 'active_support/core_ext/numeric/time'
-require 'fast_jsonapi/helpers'
 require 'fast_jsonapi/attribute'
-require 'fast_jsonapi/relationship'
+require 'fast_jsonapi/conditional'
+require 'fast_jsonapi/helpers'
 require 'fast_jsonapi/link'
+require 'fast_jsonapi/relationship'
 require 'fast_jsonapi/serialization_core'
 
 module FastJsonapi
@@ -284,7 +285,7 @@ module FastJsonapi
           relationship_type: relationship_type,
           cached: options[:cached],
           polymorphic: polymorphic,
-          conditional_proc: options[:if],
+          conditional: Conditional.new(options.slice(*Conditional::CONDITIONAL_KEYS)),
           transform_method: @transform_method,
           meta: options[:meta],
           links: options[:links],

lib/fast_jsonapi/relationship.rb

@@ -1,6 +1,6 @@
 module FastJsonapi
   class Relationship
-    attr_reader :owner, :key, :name, :id_method_name, :record_type, :object_method_name, :object_block, :serializer, :relationship_type, :cached, :polymorphic, :conditional_proc, :transform_method, :links, :meta, :lazy_load_data
+    attr_reader :owner, :key, :name, :id_method_name, :record_type, :object_method_name, :object_block, :serializer, :relationship_type, :cached, :polymorphic, :conditional, :transform_method, :links, :meta, :lazy_load_data
 
     def initialize(
       owner:,
@@ -14,7 +14,7 @@ module FastJsonapi
       relationship_type:,
       cached: false,
       polymorphic:,
-      conditional_proc:,
+      conditional:,
       transform_method:,
       links:,
       meta:,
@@ -31,7 +31,7 @@ module FastJsonapi
       @relationship_type = relationship_type
       @cached = cached
       @polymorphic = polymorphic
-      @conditional_proc = conditional_proc
+      @conditional = conditional
       @transform_method = transform_method
       @links = links || {}
       @meta = meta || {}
@@ -59,11 +59,7 @@ module FastJsonapi
     end
 
     def include_relationship?(record, serialization_params)
-      if conditional_proc.present?
+      conditional.allowed?(record: record, serialization_params: serialization_params)
-        FastJsonapi.call_proc(conditional_proc, record, serialization_params)
-      else
-        true
-      end
     end
 
     def serializer_for(record, serialization_params)

lib/fast_jsonapi/scalar.rb

@@ -1,15 +1,17 @@
+require 'fast_jsonapi/conditional'
+
 module FastJsonapi
   class Scalar
-    attr_reader :key, :method, :conditional_proc
+    attr_reader :key, :method, :conditional
 
     def initialize(key:, method:, options: {})
       @key = key
       @method = method
-      @conditional_proc = options[:if]
+      @conditional = Conditional.new(options.slice(*Conditional::CONDITIONAL_KEYS))
     end
 
     def serialize(record, serialization_params, output_hash)
-      if conditionally_allowed?(record, serialization_params)
+      if conditional.allowed?(record: record, serialization_params: serialization_params)
         if method.is_a?(Proc)
           output_hash[key] = FastJsonapi.call_proc(method, record, serialization_params)
         else
@@ -17,13 +19,5 @@ module FastJsonapi
         end
       end
     end
-
-    def conditionally_allowed?(record, serialization_params)
-      if conditional_proc.present?
-        FastJsonapi.call_proc(conditional_proc, record, serialization_params)
-      else
-        true
-      end
-    end
   end
 end