Schema and Field #==

lib/parametric/field.rb

@@ -23,6 +23,10 @@ def initialize(key, registry = Parametric.registry)
       @policies = []
     end
 
+    def ==(other)
+      other.is_a?(Field) && key == other.key && policies == other.policies && meta_data == other.meta_data
+    end
+
     def meta(hash = nil)
       @meta_data = @meta_data.merge(hash) if hash.is_a?(Hash)
       self

lib/parametric/policy_adapter.rb

@@ -61,5 +61,9 @@ def meta_data
     def key
       @policy.key
     end
+
+    def ==(other)
+      key == other.key && meta_data == other.meta_data
+    end
   end
 end

lib/parametric/schema.rb

@@ -18,6 +18,10 @@ def initialize(options = {}, &block)
       @after_hooks = []
     end
 
+    def ==(other)
+      other.is_a?(Schema) && fields == other.fields
+    end
+
     def schema
       self
     end

spec/field_spec.rb

@@ -59,6 +59,24 @@ def has_error(key, message)
     end
   end
 
+  describe '#==' do
+    it 'compares by key' do
+      field_a = described_class.new(:a_key, registry)
+      field_b = described_class.new(:a_key, registry)
+      field_c = described_class.new(:another_key, registry)
+      expect(field_a).to eq(field_b)
+      expect(field_a).not_to eq(field_c)
+    end
+
+    it 'compares by policies' do
+      field_a = described_class.new(:a_key, registry).type(:integer)
+      field_b = described_class.new(:a_key, registry).type(:integer)
+      field_c = described_class.new(:a_key, registry).type(:integer).options([1,2,3])
+      expect(field_a).to eq(field_b)
+      expect(field_a).not_to eq(field_c)
+    end
+  end
+
   describe "#policy" do
     it "coerces integer" do
       subject.policy(:integer)

spec/schema_spec.rb

@@ -46,6 +46,29 @@
     end
   end
 
+  specify '#==' do
+    schema2 = described_class.new do
+      field(:title).policy(:string).present
+      field(:price).policy(:integer).meta(label: "A price")
+      field(:status).policy(:string).options(['visible', 'hidden'])
+      field(:tags).policy(:split).policy(:array)
+      field(:description).policy(:string)
+      field(:variants).policy(:array).schema do
+        field(:name).policy(:string).present
+        field(:sku)
+        field(:stock).policy(:integer).default(1)
+        field(:available_if_no_stock).policy(:boolean).policy(:flexible_bool).default(false)
+      end
+    end
+
+    schema3 = described_class.new do
+      field(:title).policy(:string).present
+    end
+
+    expect(subject).to eq schema2
+    expect(subject).not_to eq schema3
+  end
+
   def resolve(schema, payload, &block)
     yield schema.resolve(payload)
   end