diff --git a/lib/ransack/helpers/form_helper.rb b/lib/ransack/helpers/form_helper.rb
index 90665da8..966eaf60 100644
--- a/lib/ransack/helpers/form_helper.rb
+++ b/lib/ransack/helpers/form_helper.rb
@@ -10,7 +10,7 @@ def search_form_for(record, options = {}, &proc)
         search = extract_search_and_set_url(record, options, 'search_form_for')
         options[:html] ||= {}
         html_options = build_html_options(search, options, :get)
-        finalize_form_options(options, html_options)
+        finalize_form_options(search, options, html_options)
         form_for(record, options, &proc)
       end
 
@@ -30,7 +30,7 @@ def search_form_with(record_or_options = {}, options = {}, &proc)
         search = extract_search_and_set_url(record, options, 'search_form_with')
         options[:html] ||= {}
         html_options = build_html_options(search, options, :get)
-        finalize_form_with_options(options, html_options)
+        finalize_form_with_options(search, options, html_options)
         form_with(model: search, **options, &proc)
       end
 
@@ -48,7 +48,7 @@ def turbo_search_form_for(record, options = {}, &proc)
         turbo_options = build_turbo_options(options)
         method = options.delete(:method) || :post
         html_options = build_html_options(search, options, method).merge(turbo_options)
-        finalize_form_options(options, html_options)
+        finalize_form_options(search, options, html_options)
         form_for(record, options, &proc)
       end
 
@@ -122,14 +122,14 @@ def build_html_options(search, options, method)
           }
         end
 
-        def finalize_form_options(options, html_options)
-          options[:as] ||= Ransack.options[:search_key]
+        def finalize_form_options(search, options, html_options)
+          options[:as] ||= search.context.search_key
           options[:html].reverse_merge!(html_options)
           options[:builder] ||= FormBuilder
         end
 
-        def finalize_form_with_options(options, html_options)
-          options[:scope] ||= Ransack.options[:search_key]
+        def finalize_form_with_options(search, options, html_options)
+          options[:scope] ||= search.context.search_key
           options[:html].reverse_merge!(html_options)
           options[:builder] ||= FormBuilder
         end
diff --git a/spec/ransack/helpers/form_helper_spec.rb b/spec/ransack/helpers/form_helper_spec.rb
index f0b78d40..693a700e 100644
--- a/spec/ransack/helpers/form_helper_spec.rb
+++ b/spec/ransack/helpers/form_helper_spec.rb
@@ -859,6 +859,21 @@ module Helpers
         it { should match /example_name_eq/ }
       end
 
+      # Regression test for https://github.com/activerecord-hackery/ransack/issues/1118
+      # When a per-search `search_key:` option is passed to `Person.ransack`,
+      # `search_form_for` should honour it instead of falling back to the
+      # global `Ransack.options[:search_key]`. `sort_link` and `sort_url`
+      # already read this from the search's context.
+      describe '#search_form_for with per-search search_key' do
+        subject {
+          @controller.view_context
+          .search_form_for(Person.ransack({}, search_key: :people_search)) { |f|
+            f.text_field :name_eq
+          }
+        }
+        it { should match /people_search_name_eq/ }
+      end
+
       describe '#search_form_with with default format' do
         subject { @controller.view_context
           .search_form_with(model: Person.ransack) {} }
@@ -903,6 +918,17 @@ module Helpers
         it { should match /example\[name_eq\]/ }
       end
 
+      # Regression test for https://github.com/activerecord-hackery/ransack/issues/1118
+      describe '#search_form_with with per-search search_key' do
+        subject {
+          @controller.view_context
+          .search_form_with(model: Person.ransack({}, search_key: :people_search)) { |f|
+            f.text_field :name_eq
+          }
+        }
+        it { should match /people_search\[name_eq\]/ }
+      end
+
       describe '#search_form_with without Ransack::Search object' do
         it 'raises ArgumentError' do
           expect {