Remove ModelsGraphqlOutput::graphql_types, as it's not used. (#769)

### What

This removes an unused field. The remaining struct had just one field
and is private to the crate, so I converted it to a type alias.

### How

In order to make `rustc` highlight the issue, I reduced the number of
types we export as `pub`, changing some to `pub(crate)`.

Then I just deleted the field once the warning showed up.

V3_GIT_ORIGIN_REV_ID: 7a26e99f062ed0f2c7449e1f57bc76068f059afb

v3/crates/metadata-resolve/src/stages/mod.rs

@@ -154,10 +154,7 @@ pub fn resolve(
 
     // Resolve the filter expressions and graphql settings for models
     // This is a separate step so we can look up resolved models and their sources
-    let models_graphql::ModelsGraphqlOutput {
-        models_with_graphql,
-        graphql_types: _,
-    } = models_graphql::resolve(
+    let models_with_graphql = models_graphql::resolve(
         &metadata_accessor,
         &models,
         &data_connector_scalars,

v3/crates/metadata-resolve/src/stages/model_permissions/types.rs

@@ -1,23 +1,22 @@
+use std::collections::BTreeMap;
+
+use serde::{Deserialize, Serialize};
+
+use open_dds::{
+    arguments::ArgumentName,
+    data_connector::{DataConnectorColumnName, DataConnectorOperatorName},
+    models::ModelName,
+    permissions::Role,
+    relationships::{RelationshipName, RelationshipType},
+    types::{CustomTypeName, FieldName},
+};
+
 use crate::stages::{data_connectors, models, models_graphql, object_types, relationships};
 use crate::types::error::{Error, RelationshipError};
 use crate::types::permission::ValueExpression;
 use crate::types::subgraph::{deserialize_qualified_btreemap, serialize_qualified_btreemap};
-use open_dds::{
-    data_connector::{DataConnectorColumnName, DataConnectorOperatorName},
-    models::ModelName,
-    relationships::{RelationshipName, RelationshipType},
-    types::CustomTypeName,
-};
-
-use std::collections::BTreeMap;
-
 use crate::types::subgraph::{Qualified, QualifiedTypeReference};
 
-use ndc_models;
-
-use open_dds::{arguments::ArgumentName, permissions::Role, types::FieldName};
-use serde::{Deserialize, Serialize};
-
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
 pub struct ModelWithPermissions {
     pub model: models::Model,

v3/crates/metadata-resolve/src/stages/models_graphql/mod.rs

@@ -1,25 +1,27 @@
 mod filter;
 mod graphql;
 mod types;
-use crate::types::subgraph::Qualified;
+
+use std::collections::{BTreeMap, BTreeSet};
+
+use indexmap::IndexMap;
+
+use lang_graphql::ast::common as ast;
+use open_dds::{data_connector::DataConnectorName, models::ModelName, types::CustomTypeName};
 
 use crate::stages::{
     boolean_expressions, data_connector_scalar_types, graphql_config, models,
     object_boolean_expressions, relationships,
 };
 use crate::types::error::Error;
+use crate::types::subgraph::Qualified;
+
+pub(crate) use types::ModelWithGraphql;
 pub use types::{
-    ModelExpressionType, ModelGraphQlApi, ModelOrderByExpression, ModelWithGraphql,
-    ModelsGraphqlOutput, SelectAggregateGraphQlDefinition, SelectManyGraphQlDefinition,
-    SelectUniqueGraphQlDefinition,
+    ModelExpressionType, ModelGraphQlApi, ModelOrderByExpression, SelectAggregateGraphQlDefinition,
+    SelectManyGraphQlDefinition, SelectUniqueGraphQlDefinition,
 };
 
-use open_dds::{data_connector::DataConnectorName, models::ModelName, types::CustomTypeName};
-
-use indexmap::IndexMap;
-use lang_graphql::ast::common::{self as ast};
-use std::collections::{BTreeMap, BTreeSet};
-
 pub fn resolve(
     metadata_accessor: &open_dds::accessor::MetadataAccessor,
     models: &IndexMap<Qualified<ModelName>, models::Model>,
@@ -35,9 +37,11 @@ pub fn resolve(
     boolean_expression_types: &boolean_expressions::BooleanExpressionTypes,
     existing_graphql_types: &BTreeSet<ast::TypeName>,
     graphql_config: &graphql_config::GraphqlConfig,
-) -> Result<ModelsGraphqlOutput, Error> {
-    let mut models_with_graphql = IndexMap::new();
-    let mut graphql_types = existing_graphql_types.clone();
+) -> Result<types::ModelsWithGraphql, Error> {
+    let mut models_with_graphql = types::ModelsWithGraphql::new();
+
+    // Used to ensure we don't resolve the same type twice.
+    let mut existing_graphql_types = existing_graphql_types.clone();
 
     for (model_name, model) in models.clone() {
         let filter_expression_type = match &model.raw.filter_expression_type {
@@ -70,18 +74,18 @@ pub fn resolve(
                 metadata_accessor,
                 model_graphql_definition,
                 &model,
-                &mut graphql_types,
+                &mut existing_graphql_types,
                 data_connector_scalars,
                 &model.raw.description,
                 &model.aggregate_expression,
                 graphql_config,
             )?,
-            None => ModelGraphQlApi::default(),
+            None => types::ModelGraphQlApi::default(),
         };
 
         models_with_graphql.insert(
             model_name,
-            ModelWithGraphql {
+            types::ModelWithGraphql {
                 inner: model,
                 graphql_api,
                 filter_expression_type,
@@ -89,8 +93,5 @@ pub fn resolve(
         );
     }
 
-    Ok(ModelsGraphqlOutput {
-        models_with_graphql,
-        graphql_types,
-    })
+    Ok(models_with_graphql)
 }

v3/crates/metadata-resolve/src/stages/models_graphql/types.rs

@@ -1,31 +1,28 @@
-use crate::stages::{boolean_expressions, models, object_boolean_expressions};
-use crate::types::subgraph::{Qualified, QualifiedTypeReference};
+use std::collections::BTreeMap;
+
 use indexmap::IndexMap;
+use serde::{Deserialize, Serialize};
+
+use lang_graphql::ast::common::{self as ast};
 use open_dds::{
+    aggregates::AggregateExpressionName,
     data_connector::{DataConnectorColumnName, DataConnectorName},
     models::ModelName,
-    types::FieldName,
+    types::{Deprecated, FieldName},
 };
-use serde::{Deserialize, Serialize};
-use std::collections::{BTreeMap, BTreeSet};
 
 use crate::helpers::types::NdcColumnForComparison;
-use lang_graphql::ast::common::{self as ast};
-
-use open_dds::aggregates::AggregateExpressionName;
-use open_dds::types::Deprecated;
+use crate::stages::{boolean_expressions, models, object_boolean_expressions};
+use crate::types::subgraph::{Qualified, QualifiedTypeReference};
 
 /// A Model, once we have added filter expression and graphql for it
-pub struct ModelWithGraphql {
+pub(crate) struct ModelWithGraphql {
     pub inner: models::Model,
     pub filter_expression_type: Option<ModelExpressionType>,
     pub graphql_api: ModelGraphQlApi,
 }
 
-pub struct ModelsGraphqlOutput {
-    pub models_with_graphql: IndexMap<Qualified<ModelName>, ModelWithGraphql>,
-    pub graphql_types: BTreeSet<ast::TypeName>,
-}
+pub(crate) type ModelsWithGraphql = IndexMap<Qualified<ModelName>, ModelWithGraphql>;
 
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
 pub enum ModelExpressionType {