support sub flows

app/graphql/types/flow_setting_type.rb

@@ -6,6 +6,10 @@ class FlowSettingType < Types::BaseObject
 
     authorize :read_flow
 
+    field :cast, String,
+          null: true,
+          description: 'The cast applied to the flow setting'
+
     field :flow_setting_identifier, String,
           null: false,
           method: :flow_setting_id,

app/graphql/types/input/flow_setting_input_type.rb

@@ -5,6 +5,9 @@ module Input
     class FlowSettingInputType < Types::BaseInputObject
       description 'Input type for flow settings'
 
+      argument :cast, String,
+               required: false,
+               description: 'The cast applied to the flow setting'
       argument :value, GraphQL::Types::JSON, required: true,
                                              description: 'The value of the flow setting'
     end

app/graphql/types/input/node_parameter_input_type.rb

@@ -5,6 +5,9 @@ module Input
     class NodeParameterInputType < Types::BaseInputObject
       description 'Input type for Node parameter'
 
+      argument :cast, String,
+               required: false,
+               description: 'The cast applied to the parameter'
       argument :value, Types::Input::NodeParameterValueInputType, required: true,
                                                                   description: 'The value of the parameter'
     end

app/graphql/types/input/node_parameter_value_input_type.rb

@@ -7,12 +7,12 @@ class NodeParameterValueInputType < Types::BaseInputObject
 
       argument :literal_value, GraphQL::Types::JSON,
                required: false, description: 'The literal value of the parameter'
-      argument :node_function_id, Types::GlobalIdType[::NodeFunction],
-               required: false, description: 'The function value of the parameter as an id'
       argument :reference_value, Types::Input::ReferenceValueInputType,
                required: false, description: 'The reference value of the parameter'
+      argument :sub_flow_value, Types::Input::SubFlowValueInputType,
+               required: false, description: 'The sub-flow value of the parameter'
 
-      require_one_of %i[node_function_id literal_value reference_value]
+      require_one_of %i[literal_value reference_value sub_flow_value]
     end
   end
 end

app/graphql/types/input/sub_flow_value_input_type.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+module Types
+  module Input
+    class SubFlowValueInputType < Types::BaseInputObject
+      description 'Input type for sub-flow parameter values'
+
+      argument :function_identifier, String,
+               required: false,
+               description: 'The function identifier to execute'
+      argument :settings, [Types::Input::SubFlowValueSettingInputType],
+               required: false,
+               description: 'The sub-flow settings'
+      argument :signature, String,
+               required: true,
+               description: 'The sub-flow signature'
+      argument :starting_node_id, Types::GlobalIdType[::NodeFunction],
+               required: false,
+               description: 'The starting node to execute'
+
+      require_one_of %i[starting_node_id function_identifier]
+    end
+  end
+end

app/graphql/types/input/sub_flow_value_setting_input_type.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+module Types
+  module Input
+    class SubFlowValueSettingInputType < Types::BaseInputObject
+      description 'Input type for sub-flow settings'
+
+      argument :default_value, GraphQL::Types::JSON,
+               required: false,
+               description: 'The default value of the sub-flow setting'
+      argument :hidden, Boolean,
+               required: false,
+               description: 'Whether the sub-flow setting is hidden'
+      argument :identifier, String,
+               required: true,
+               description: 'The identifier of the sub-flow setting'
+      argument :optional, Boolean,
+               required: false,
+               description: 'Whether the sub-flow setting is optional'
+    end
+  end
+end

app/graphql/types/node_parameter_type.rb

@@ -6,15 +6,16 @@ class NodeParameterType < Types::BaseObject
 
     authorize :read_flow
 
+    field :cast, String, null: true, description: 'The cast applied to the parameter'
     field :parameter_definition, Types::ParameterDefinitionType, null: false,
                                                                  description: 'The definition of the parameter'
     field :value, Types::NodeParameterValueType, null: true, description: 'The value of the parameter'
 
     def value
       if object.reference_value.present?
         object.reference_value
-      elsif object.function_value.present?
-        object.function_value
+      elsif object.sub_flow.present?
+        object.sub_flow
       else
         object.literal_value
       end

app/graphql/types/node_parameter_value_type.rb

@@ -4,15 +4,15 @@ module Types
   class NodeParameterValueType < Types::BaseUnion
     description 'Represents a parameter value for a node.'
 
-    possible_types Types::LiteralValueType, Types::ReferenceValueType, Types::NodeFunctionIdWrapperType,
-                   description: 'The value can be a literal, a reference, or a node function id.'
+    possible_types Types::SubFlowValueType, Types::LiteralValueType, Types::ReferenceValueType,
+                   description: 'The value can be a literal, a reference, or a sub-flow.'
 
     def self.resolve_type(object, _context)
       case object
       when ReferenceValue
         Types::ReferenceValueType
-      when NodeFunction
-        Types::NodeFunctionIdWrapperType
+      when SubFlow
+        Types::SubFlowValueType
       else
         Types::LiteralValueType
       end

app/graphql/types/sub_flow_value_setting_type.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+module Types
+  class SubFlowValueSettingType < Types::BaseObject
+    description 'Represents a sub-flow setting.'
+
+    field :default_value, GraphQL::Types::JSON,
+          null: true,
+          description: 'The default value of the sub-flow setting.'
+    field :hidden, Boolean,
+          null: true,
+          description: 'Whether the sub-flow setting is hidden.'
+    field :identifier, String,
+          null: false,
+          description: 'The identifier of the sub-flow setting.'
+    field :optional, Boolean,
+          null: true,
+          description: 'Whether the sub-flow setting is optional.'
+  end
+end

app/graphql/types/sub_flow_value_type.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+module Types
+  class SubFlowValueType < Types::BaseObject
+    description 'Represents a sub-flow parameter value.'
+
+    field :function_definition, Types::FunctionDefinitionType,
+          null: true,
+          description: 'The resolved function definition to execute.'
+    field :settings, [Types::SubFlowValueSettingType],
+          method: :sub_flow_settings,
+          null: false,
+          description: 'The sub-flow settings.'
+    field :signature, String,
+          null: false,
+          description: 'The sub-flow signature.'
+    field :starting_node_id, GlobalIdType[::NodeFunction],
+          null: true,
+          description: 'The starting node to execute.'
+
+    def starting_node_id
+      object.starting_node&.to_global_id
+    end
+  end
+end

app/models/flow_setting.rb

@@ -9,7 +9,8 @@ def to_grpc
     Tucana::Shared::FlowSetting.new(
       database_id: id,
       flow_setting_id: flow_setting_id,
-      value: Tucana::Shared::Value.from_ruby(object)
+      value: Tucana::Shared::Value.from_ruby(object),
+      cast: cast
     )
   end
 end

app/models/node_function.rb

@@ -5,11 +5,6 @@ class NodeFunction < ApplicationRecord
   belongs_to :next_node, class_name: 'NodeFunction', optional: true
   belongs_to :flow, class_name: 'Flow'
 
-  belongs_to :value_of_node_parameter,
-             class_name: 'NodeParameter',
-             inverse_of: :function_value,
-             optional: true
-
   has_one :previous_node,
           class_name: 'NodeFunction',
           foreign_key: :next_node_id,

app/models/node_parameter.rb

@@ -5,22 +5,23 @@ class NodeParameter < ApplicationRecord
   belongs_to :node_function, class_name: 'NodeFunction', inverse_of: :node_parameters
 
   has_one :reference_value, autosave: true
-  has_one :function_value, class_name: 'NodeFunction', inverse_of: :value_of_node_parameter
+  has_one :sub_flow, autosave: true
 
   validate :only_one_value_present
 
   def to_grpc
     param = Tucana::Shared::NodeParameter.new(
       database_id: id,
-      runtime_parameter_id: parameter_definition.runtime_parameter_definition.runtime_name
+      runtime_parameter_id: parameter_definition.runtime_parameter_definition.runtime_name,
+      cast: cast
     )
 
     param.value = Tucana::Shared::NodeValue.new(literal_value: Tucana::Shared::Value.from_ruby({}))
 
     if reference_value.present?
       param.value.reference_value = reference_value.to_grpc
-    elsif function_value.present?
-      param.value.node_function_id = function_value.id
+    elsif sub_flow.present?
+      param.value.sub_flow = sub_flow.to_grpc
     else
       param.value.literal_value = Tucana::Shared::Value.from_ruby(literal_value)
     end
@@ -31,9 +32,9 @@ def to_grpc
   private
 
   def only_one_value_present
-    values = [!literal_value.nil?, reference_value.present?, function_value.present?]
+    values = [!literal_value.nil?, reference_value.present?, sub_flow.present?]
     return if values.count(true) <= 1
 
-    errors.add(:value, 'Only one of literal_value, reference_value, or function_value must be present')
+    errors.add(:value, 'Only one of literal_value, reference_value, or sub_flow must be present')
   end
 end

app/models/sub_flow.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+class SubFlow < ApplicationRecord
+  belongs_to :node_parameter, inverse_of: :sub_flow
+  belongs_to :starting_node, class_name: 'NodeFunction', optional: true
+  belongs_to :function_definition, optional: true
+
+  has_many :sub_flow_settings, inverse_of: :sub_flow, autosave: true
+
+  validate :validate_execution_reference
+
+  def function_identifier
+    function_definition&.identifier
+  end
+
+  def to_grpc
+    Tucana::Shared::SubFlow.new(
+      starting_node_id: starting_node_id,
+      function_identifier: function_identifier,
+      signature: signature,
+      settings: sub_flow_settings.map(&:to_grpc)
+    )
+  end
+
+  private
+
+  def validate_execution_reference
+    return if [starting_node.present?, function_definition.present?].count(true) == 1
+
+    errors.add(:base, 'Exactly one of starting_node or function_definition must be present')
+  end
+end

app/models/sub_flow_setting.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+class SubFlowSetting < ApplicationRecord
+  belongs_to :sub_flow, inverse_of: :sub_flow_settings
+
+  validates :identifier, presence: true
+
+  def to_grpc
+    Tucana::Shared::SubFlowSetting.new(
+      identifier: identifier,
+      default_value: Tucana::Shared::Value.from_ruby(default_value),
+      optional: optional,
+      hidden: hidden
+    )
+  end
+end

app/services/error_code.rb

@@ -88,7 +88,6 @@ def self.error_codes
       cyclic_data_type_reference: { description: 'A data type dependency cycle was detected' },
       invalid_data_type_link: { description: 'The data type link is invalid because of active model errors' },
       node_not_found: { description: 'The node with this id does not exist' },
-      function_value_not_found: { description: 'The id for the function value node does not exist' },
       invalid_node_parameter: { description: 'The node parameter is invalid' },
       invalid_node_function: { description: 'The node function is invalid' },
       invalid_runtime_status: { description: 'The runtime status is invalid because of active model errors' },