Return ingredients value if element asked for ingredient

Adds deprecated support for returning an ingredients value if the element
is asked for its ingredient. This helps to migrate existing sites to ingredients.

With the next version of Alchemy this behavior is changed to return the ingredient
record instead.

A helpful deprecation notice is logged.

app/helpers/alchemy/elements_block_helper.rb

@@ -51,21 +51,23 @@ def content(name)
       # If the element uses +ingredients+ it returns the +value+ of the ingredient record.
       #
       def ingredient(name)
-        element.ingredient(name).presence || element.ingredient_by_role(name)&.value
+        element.ingredient(name)
       end
 
-      deprecate ingredient: :value, deprecator: Alchemy::Deprecation
-
       # Returns the value of one of the element's ingredients.
       #
       def value(name)
-        element.ingredient_by_role(name)&.value
+        element.value_for(name)
       end
 
-      # Returns true if the given content or ingredient has been filled by the user.
+      # Returns true if the given content or ingredient has a value.
       #
       def has?(name)
-        element.has_ingredient?(name) || element.has_value_for?(name)
+        if element.ingredient_definitions.any?
+          element.has_value_for?(name)
+        else
+          element.has_ingredient?(name)
+        end
       end
 
       # Return's the given content's essence.

app/models/alchemy/element/element_essences.rb

@@ -5,17 +5,28 @@ class Element < BaseRecord
     module ElementEssences
       # Returns the contents essence value (aka. ingredient) for passed content name.
       def ingredient(name)
-        content = content_by_name(name)
-        return nil if content.blank?
+        ing = ingredient_by_role(name)
+        if ing
+          Alchemy::Deprecation.warn <<~WARN
+            Using `element.ingredient` to get the value of an ingredient is deprecated and will change in Alchemy 6.1
+            If you want to read the value of an elements ingredient please use `element.value_for(:ingredient_role)` instead.
+            The next version of Alchemy will return a `Alchemy::Ingredient` record instead.
+          WARN
+          ing.value
+        else
+          content = content_by_name(name)
+          return nil if content.blank?
 
-        content.ingredient
+          content.ingredient
+        end
       end
 
       # True if the element has a content for given name,
       # that has an essence value (aka. ingredient) that is not blank.
       def has_ingredient?(name)
         ingredient(name).present?
       end
+      deprecate has_ingredient?: :has_value_for?, deprecator: Alchemy::Deprecation
 
       # Returns all essence errors in the format of:
       #

app/models/alchemy/element/element_ingredients.rb

@@ -22,6 +22,11 @@ module ElementIngredients
         validates_associated :ingredients, on: :update
       end
 
+      # The value of an ingredient of the element by role
+      def value_for(role)
+        ingredient_by_role(role)&.value
+      end
+
       # Find first ingredient from element by given role.
       def ingredient_by_role(role)
         ingredients.detect { |ingredient| ingredient.role == role.to_s }
@@ -87,7 +92,7 @@ def ingredients_with_errors
       # True if the element has a ingredient for given name
       # that has a non blank value.
       def has_value_for?(role)
-        ingredient_by_role(role)&.value.present?
+        value_for(role).present?
       end
 
       # Ingredient validation error messages

spec/helpers/alchemy/elements_block_helper_spec.rb

@@ -119,12 +119,24 @@ module Alchemy
           let(:ingredient) { element.ingredients.first }
 
           it "should return the ingredients value" do
-            expect(ingredient).to receive(:value).and_call_original
-            subject.ingredient(:headline)
+            Alchemy::Deprecation.silenced do
+              expect(ingredient).to receive(:value).and_call_original
+              subject.ingredient(:headline)
+            end
           end
         end
       end
 
+      describe "#value" do
+        let(:element) { create(:alchemy_element, :with_ingredients) }
+        let(:ingredient) { element.ingredients.first }
+
+        it "should return the ingredients value" do
+          expect(element).to receive(:value_for).and_call_original
+          subject.value(:headline)
+        end
+      end
+
       describe "#has?" do
         context "with element having contents" do
           it "should delegate to the element's #has_ingredient? method" do

spec/models/alchemy/element_ingredients_spec.rb

@@ -66,6 +66,36 @@
     end
   end
 
+  describe "#value_for" do
+    let!(:element) { create(:alchemy_element, :with_ingredients) }
+
+    context "with role existing" do
+      let(:ingredient) { element.ingredients.first }
+
+      context "with blank value" do
+        before do
+          expect(ingredient).to receive(:value) { nil }
+        end
+
+        it { expect(element.value_for(:headline)).to be_nil }
+      end
+
+      context "with value present" do
+        before do
+          expect(ingredient).to receive(:value) { "Headline" }
+        end
+
+        it "should return value" do
+          expect(element.value_for(:headline)).to eq("Headline")
+        end
+      end
+    end
+
+    context "role not existing" do
+      it { expect(element.value_for(:foo)).to be_nil }
+    end
+  end
+
   describe "#has_value_for?" do
     let!(:element) { create(:alchemy_element, :with_ingredients) }
 

spec/models/alchemy/element_spec.rb

@@ -721,8 +721,27 @@ module Alchemy
     context "retrieving contents, essences and ingredients" do
       let(:element) { create(:alchemy_element, :with_contents, name: "news") }
 
-      it "should return an ingredient by name" do
-        expect(element.ingredient("news_headline")).to eq(EssenceText.first.ingredient)
+      describe "#ingredient" do
+        context "with contents" do
+          let(:essence) { element.content_by_name(:news_headline) }
+
+          it "returns a contents value by name" do
+            expect(essence).to receive(:ingredient).and_call_original
+            element.ingredient("news_headline")
+          end
+        end
+
+        context "with ingredients" do
+          let(:element) { create(:alchemy_element, :with_ingredients) }
+          let(:ingredient) { element.ingredient_by_role(:headline) }
+
+          it "returns a ingredients value by name" do
+            Alchemy::Deprecation.silenced do
+              expect(ingredient).to receive(:value).and_call_original
+              element.ingredient("headline")
+            end
+          end
+        end
       end
 
       it "should return the content for rss title" do