Introduce partial search similar to Rails

app/helpers/administrate/application_helper.rb

@@ -9,7 +9,15 @@ def application_title
 
     def render_field(field, locals = {})
       locals[:field] = field
-      render locals: locals, partial: field.to_partial_path
+      if (prefix = find_partial_prefix(field))
+        render locals: locals, partial: "#{prefix}/#{field.page}"
+      end
+    end
+
+    def find_partial_prefix(field)
+      field._partial_prefixes.detect do |prefix|
+        lookup_context.template_exists?(field.page, [prefix], true)
+      end
     end
 
     def requireness(field)

lib/administrate/field/base.rb

@@ -32,6 +32,19 @@ def self.permitted_attribute(attr, _options = nil)
         attr
       end
 
+      def self._partial_prefixes
+        @_partial_prefixes ||= begin
+          return local_partial_prefixes if superclass == Administrate::Field::Base
+
+          local_partial_prefixes + superclass._partial_prefixes
+        end
+      end
+
+      def self.local_partial_prefixes
+        ["fields/#{field_type}"]
+      end
+      private_class_method :local_partial_prefixes
+
       def initialize(attribute, data, page, options = {})
         @attribute = attribute
         @data = data
@@ -52,8 +65,8 @@ def name
         attribute.to_s
       end
 
-      def to_partial_path
-        "/fields/#{self.class.field_type}/#{page}"
+      def _partial_prefixes
+        self.class._partial_prefixes
       end
 
       def required?

spec/administrate/views/fields/has_one/_show_spec.rb

@@ -35,7 +35,8 @@
         name: "simple_string_field",
         truncate: "string value",
         html_class: "string",
-        to_partial_path: "fields/string/index"
+        page: "index",
+        _partial_prefixes: ["fields/string"]
       )
 
       nested_show_page_for_has_one = instance_double(
@@ -123,7 +124,8 @@ def render_field
         data: nested_collection,
         html_class: "has-many",
         name: "payments",
-        to_partial_path: "fields/has_many/index"
+        page: "index",
+        _partial_prefixes: ["fields/has_many"]
       )
 
       nested_show_page_for_nested_has_one = instance_double(
@@ -141,7 +143,8 @@ def render_field
         linkable?: true,
         nested_show: nested_show_page_for_nested_has_one,
         html_class: "has-one",
-        to_partial_path: "fields/has_one/show",
+        page: "show",
+        _partial_prefixes: ["fields/has_one"],
         display_associated_resource: "Resource Doubly Nested with HasOne",
         name: "page"
       )

spec/helpers/administrate/application_helper_spec.rb

@@ -1,6 +1,24 @@
 require "rails_helper"
+require "administrate/field/has_many"
+require "administrate/field/has_many_variant"
 
 RSpec.describe Administrate::ApplicationHelper do
+  describe "#find_partial_prefix" do
+    context "when the field has a partial" do
+      it "returns the prefix" do
+        field = Administrate::Field::HasMany.new(:name, "hello", :show)
+        expect(find_partial_prefix(field)).to eq("fields/has_many")
+      end
+    end
+
+    context "when the field does not have a partial and the superclass does" do
+      it "returns the superclass prefix" do
+        field = Administrate::Field::HasManyVariant.new(:name, "hello", :show)
+        expect(find_partial_prefix(field)).to eq("fields/has_many")
+      end
+    end
+  end
+
   describe "#display_resource_name" do
     it "defaults to the plural of the model name" do
       displayed = display_resource_name(:customer)

spec/lib/fields/belongs_to_spec.rb

@@ -26,15 +26,15 @@
     end
   end
 
-  describe "#to_partial_path" do
+  describe "#_partial_prefixes" do
     it "returns a partial based on the page being rendered" do
       page = :show
       owner = double
       field = Administrate::Field::BelongsTo.new(:owner, owner, page)
 
-      path = field.to_partial_path
+      prefixes = field._partial_prefixes
 
-      expect(path).to eq("/fields/belongs_to/#{page}")
+      expect(prefixes).to eq(["fields/belongs_to", "fields/associative"])
     end
   end
 

spec/lib/fields/boolean_spec.rb

@@ -5,15 +5,15 @@
 describe Administrate::Field::Boolean do
   include FieldMatchers
 
-  describe "#to_partial_path" do
+  describe "#_partial_prefixes" do
     it "returns a partial based on the page being rendered" do
       page = :show
       boolean = double
       field = Administrate::Field::Boolean.new(:price, boolean, page)
 
-      path = field.to_partial_path
+      prefixes = field._partial_prefixes
 
-      expect(path).to eq("/fields/boolean/#{page}")
+      expect(prefixes).to eq(["fields/boolean"])
     end
   end
 

spec/lib/fields/email_spec.rb

@@ -1,14 +1,14 @@
 require "administrate/field/email"
 
 describe Administrate::Field::Email do
-  describe "#to_partial_path" do
+  describe "#_partial_prefixes" do
     it "returns a partial based on the page being rendered" do
       page = :show
       field = Administrate::Field::Email.new(:email, "[email protected]", page)
 
-      path = field.to_partial_path
+      prefixes = field._partial_prefixes
 
-      expect(path).to eq("/fields/email/#{page}")
+      expect(prefixes).to eq(["fields/email"])
     end
   end
 end

spec/lib/fields/has_many_spec.rb

@@ -16,15 +16,15 @@
     end
   end
 
-  describe "#to_partial_path" do
+  describe "#_partial_prefixes" do
     it "returns a partial based on the page being rendered" do
       page = :show
       items = double
       field = Administrate::Field::HasMany.new(:items, items, page)
 
-      path = field.to_partial_path
+      prefixes = field._partial_prefixes
 
-      expect(path).to eq("/fields/has_many/#{page}")
+      expect(prefixes).to eq(["fields/has_many", "fields/associative"])
     end
   end
 

spec/lib/fields/has_one_spec.rb

@@ -77,7 +77,7 @@
     end
   end
 
-  describe "#to_partial_path" do
+  describe "#_partial_prefixes" do
     it "returns a partial based on the page being rendered" do
       resource = double
       page = :show
@@ -89,9 +89,9 @@
         resource: resource
       )
 
-      path = field.to_partial_path
+      prefixes = field._partial_prefixes
 
-      expect(path).to eq("/fields/has_one/#{page}")
+      expect(prefixes).to eq(["fields/has_one", "fields/associative"])
     end
   end
 

spec/lib/fields/number_spec.rb

@@ -5,15 +5,15 @@
 describe Administrate::Field::Number do
   include FieldMatchers
 
-  describe "#to_partial_path" do
+  describe "#_partial_prefixes" do
     it "returns a partial based on the page being rendered" do
       page = :show
       number = double
       field = Administrate::Field::Number.new(:price, number, page)
 
-      path = field.to_partial_path
+      prefixes = field._partial_prefixes
 
-      expect(path).to eq("/fields/number/#{page}")
+      expect(prefixes).to eq(["fields/number"])
     end
   end
 

spec/lib/fields/password_spec.rb

@@ -5,14 +5,14 @@
 describe Administrate::Field::Password do
   include FieldMatchers
 
-  describe "#to_partial_path" do
+  describe "#_partial_prefixes" do
     it "returns a partial based on the page being rendered" do
       page = :show
       field = Administrate::Field::Password.new(:password, "my_password", page)
 
-      path = field.to_partial_path
+      prefixes = field._partial_prefixes
 
-      expect(path).to eq("/fields/password/#{page}")
+      expect(prefixes).to eq(["fields/password"])
     end
   end
 

spec/lib/fields/polymorphic_spec.rb

@@ -18,14 +18,16 @@
     end
   end
 
-  describe "#to_partial_path" do
+  describe "#_partial_prefixes" do
     it "returns a partial based on the page being rendered" do
       page = :show
       field = Administrate::Field::Polymorphic.new(:foo, "hello", page)
 
-      path = field.to_partial_path
+      prefixes = field._partial_prefixes
 
-      expect(path).to eq("/fields/polymorphic/#{page}")
+      expect(prefixes).to eq(
+        ["fields/polymorphic", "fields/belongs_to", "fields/associative"]
+      )
     end
   end
 

spec/lib/fields/rich_text_spec.rb

@@ -13,17 +13,17 @@
     )
   end
 
-  describe "#to_partial_path" do
+  describe "#_partial_prefixes" do
     it "returns a partial based on the page being rendered" do
       page = :show
       action_text = ActionText::RichText.new(
         body: "<div class='trix'><p>Foo</p></div>"
       )
       field = Administrate::Field::RichText.new(:document, action_text, page)
 
-      path = field.to_partial_path
+      prefixes = field._partial_prefixes
 
-      expect(path).to eq("/fields/rich_text/#{page}")
+      expect(prefixes).to eq(["fields/rich_text"])
     end
   end
 

spec/lib/fields/string_spec.rb

@@ -5,14 +5,14 @@
 describe Administrate::Field::String do
   include FieldMatchers
 
-  describe "#to_partial_path" do
+  describe "#_partial_prefixes" do
     it "returns a partial based on the page being rendered" do
       page = :show
       field = Administrate::Field::String.new(:string, "hello", page)
 
-      path = field.to_partial_path
+      prefixes = field._partial_prefixes
 
-      expect(path).to eq("/fields/string/#{page}")
+      expect(prefixes).to eq(["fields/string"])
     end
   end
 

spec/lib/fields/time_spec.rb

@@ -2,15 +2,15 @@
 require "administrate/field/time"
 
 describe Administrate::Field::Time do
-  describe "#to_partial_path" do
+  describe "#_partial_prefixes" do
     it "returns a partial based on the page being rendered" do
       page = :show
       time = Time.zone.local(2000, 1, 1, 15, 45, 33)
       field = Administrate::Field::Time.new(:time, time, page)
 
-      path = field.to_partial_path
+      prefixes = field._partial_prefixes
 
-      expect(path).to eq("/fields/time/#{page}")
+      expect(prefixes).to eq(["fields/time"])
     end
   end
 

spec/lib/fields/url_spec.rb

@@ -7,14 +7,14 @@
     end
   end
 
-  describe "#to_partial_path" do
+  describe "#_partial_prefixes" do
     it "returns a partial based on the page being rendered" do
       page = :show
       field = Administrate::Field::Url.new(:url, "https://thoughtbot.com", page)
 
-      path = field.to_partial_path
+      prefixes = field._partial_prefixes
 
-      expect(path).to eq("/fields/url/#{page}")
+      expect(prefixes).to eq(["fields/url"])
     end
   end