Be more explicit about clones, and remove a few. (#671)

Calling `.to_owned()` on a reference, `.to_vec()` on a vector reference,
etc. are just synonyms for `.clone()` which are less explicit about
cloning. Let's be explicit.

This also removes some unnecessary clones.

V3_GIT_ORIGIN_REV_ID: 1bc00c4106f0346303d73e4268c89030c0ce93fc

v3/Cargo.toml

@@ -31,9 +31,7 @@ must_use_candidate = "allow"
 struct_field_names = "allow"
 wildcard_imports = "allow"
 # disable these for now, but we should probably fix them
-implicit_clone = "allow"
 implicit_hasher = "allow"
-inefficient_to_string = "allow"
 result_large_err = "allow"
 return_self_not_must_use = "allow"
 semicolon_if_nothing_returned = "allow"

v3/crates/execute/src/plan.rs

@@ -446,7 +446,7 @@ fn assign_join_ids<'s, 'ir>(
                 }
             };
             let new_location = Location {
-                join_node: new_node.to_owned(),
+                join_node: new_node.clone(),
                 rest: assign_join_ids(&location.rest, state),
             };
             (key.to_string(), new_location)

v3/crates/execute/src/remote_joins/collect.rs

@@ -305,7 +305,7 @@ fn resolve_command_response_row(
             // the array and use that as the value for the relationship otherwise
             // we return the array of objects.
             let array_values: Vec<IndexMap<String, ndc_models::RowFieldValue>> =
-                    json::from_value(json::Value::Array(values.to_vec()))?;
+                    json::from_value(json::Value::Array(values.clone()))?;
 
             if type_container.is_list(){
                 Ok(array_values)

v3/crates/metadata-resolve/src/stages/boolean_expressions/object.rs

@@ -35,7 +35,7 @@ pub(crate) fn resolve_object_boolean_expression_type(
 ) -> Result<ResolvedObjectBooleanExpressionType, Error> {
     let qualified_object_type_name = Qualified::new(
         subgraph.to_string(),
-        object_boolean_expression_operand.r#type.to_owned(),
+        object_boolean_expression_operand.r#type.clone(),
     );
 
     let object_type_representation =

v3/crates/metadata-resolve/src/stages/boolean_expressions/scalar.rs

@@ -29,9 +29,7 @@ pub(crate) fn resolve_scalar_boolean_expression_type(
         // scope the data connector to the current subgraph
         let qualified_data_connector_name = Qualified::new(
             subgraph.to_string(),
-            data_connector_operator_mapping
-                .data_connector_name
-                .to_owned(),
+            data_connector_operator_mapping.data_connector_name.clone(),
         );
 
         // lookup the data connector we are referring to

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

@@ -44,7 +44,7 @@ pub fn resolve<'a>(
 
         let qualified_data_connector_name = Qualified::new(
             subgraph.to_string(),
-            scalar_type_representation.data_connector_name.to_owned(),
+            scalar_type_representation.data_connector_name.clone(),
         );
 
         let scalars = data_connector_scalars

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

@@ -231,7 +231,7 @@ fn resolve_model(
     >,
 ) -> Result<Model, Error> {
     let qualified_object_type_name =
-        Qualified::new(subgraph.to_string(), model.object_type.to_owned());
+        Qualified::new(subgraph.to_string(), model.object_type.clone());
     let qualified_model_name = Qualified::new(subgraph.to_string(), model.name.clone());
     let object_type_representation = get_model_object_type_representation(
         object_types,

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

@@ -80,14 +80,12 @@ pub(crate) fn resolve_object_boolean_expression_type(
     graphql_config: &graphql_config::GraphqlConfig,
 ) -> Result<ObjectBooleanExpressionType, Error> {
     // name of the boolean expression
-    let qualified_name = Qualified::new(
-        subgraph.to_string(),
-        object_boolean_expression.name.to_owned(),
-    );
+    let qualified_name =
+        Qualified::new(subgraph.to_string(), object_boolean_expression.name.clone());
     // name of the object type backing the boolean expression
     let qualified_object_type_name = Qualified::new(
         subgraph.to_string(),
-        object_boolean_expression.object_type.to_owned(),
+        object_boolean_expression.object_type.clone(),
     );
     let object_type_representation =
         object_types
@@ -102,7 +100,7 @@ pub(crate) fn resolve_object_boolean_expression_type(
 
     let qualified_data_connector_name = Qualified::new(
         subgraph.to_string(),
-        object_boolean_expression.data_connector_name.to_owned(),
+        object_boolean_expression.data_connector_name.clone(),
     );
 
     // validate data connector name

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

@@ -1,30 +1,28 @@
 mod types;
-pub use types::{
-    ObjectTypeWithRelationships, Relationship, RelationshipCapabilities,
-    RelationshipCommandMapping, RelationshipExecutionCategory, RelationshipModelMapping,
-    RelationshipTarget, RelationshipTargetName,
-};
 
 use std::collections::BTreeMap;
+use std::collections::BTreeSet;
 
 use indexmap::IndexMap;
 
+use open_dds::relationships::{self, FieldAccess, RelationshipName, RelationshipV1};
 use open_dds::{
     commands::CommandName, data_connector::DataConnectorName, models::ModelName,
     types::CustomTypeName,
 };
 
-use crate::types::error::{Error, RelationshipError};
-use crate::types::subgraph::Qualified;
-
 use crate::helpers::types::mk_name;
 use crate::stages::{
     commands, data_connector_scalar_types, data_connectors, models, object_types, type_permissions,
 };
+use crate::types::error::{Error, RelationshipError};
+use crate::types::subgraph::Qualified;
 
-use open_dds::relationships::{self, FieldAccess, RelationshipName, RelationshipV1};
-
-use std::collections::BTreeSet;
+pub use types::{
+    ObjectTypeWithRelationships, Relationship, RelationshipCapabilities,
+    RelationshipCommandMapping, RelationshipExecutionCategory, RelationshipModelMapping,
+    RelationshipTarget, RelationshipTargetName,
+};
 
 /// resolve relationships
 /// returns updated `types` value
@@ -70,7 +68,7 @@ pub fn resolve(
     } in &metadata_accessor.relationships
     {
         let qualified_relationship_source_type_name =
-            Qualified::new(subgraph.to_string(), relationship.source_type.to_owned());
+            Qualified::new(subgraph.to_string(), relationship.source_type.clone());
         let object_representation = object_types_with_relationships
             .get_mut(&qualified_relationship_source_type_name)
             .ok_or_else(|| Error::RelationshipDefinedOnUnknownType {
@@ -352,11 +350,11 @@ fn resolve_relationship_mappings_command(
 fn get_relationship_capabilities(
     type_name: &Qualified<CustomTypeName>,
     relationship_name: &RelationshipName,
-    source_data_connector: &Option<data_connectors::DataConnectorLink>,
+    source_data_connector: Option<&data_connectors::DataConnectorLink>,
     target_name: &RelationshipTargetName,
     data_connectors: &data_connectors::DataConnectors,
 ) -> Result<Option<RelationshipCapabilities>, Error> {
-    let Some(data_connector) = &source_data_connector else {
+    let Some(data_connector) = source_data_connector else {
         return Ok(None);
     };
 
@@ -413,12 +411,8 @@ pub fn resolve_relationship(
     let (relationship_target, source_data_connector, target_name) = match &relationship.target {
         relationships::RelationshipTarget::Model(target_model) => {
             let qualified_target_model_name = Qualified::new(
-                target_model
-                    .subgraph()
-                    .to_owned()
-                    .unwrap_or(subgraph)
-                    .to_string(),
-                target_model.name.to_owned(),
+                target_model.subgraph().unwrap_or(subgraph).to_string(),
+                target_model.name.clone(),
             );
             let resolved_target_model =
                 models.get(&qualified_target_model_name).ok_or_else(|| {
@@ -431,7 +425,7 @@ pub fn resolve_relationship(
             let source_data_connector = resolved_target_model
                 .source
                 .as_ref()
-                .map(|source| source.data_connector.clone());
+                .map(|source| &source.data_connector);
             (
                 RelationshipTarget::Model {
                     model_name: qualified_target_model_name,
@@ -456,7 +450,7 @@ pub fn resolve_relationship(
                     .as_deref()
                     .unwrap_or(subgraph)
                     .to_string(),
-                target_command.name.to_owned(),
+                target_command.name.clone(),
             );
             let resolved_target_command =
                 commands
@@ -470,7 +464,7 @@ pub fn resolve_relationship(
             let source_data_connector = resolved_target_command
                 .source
                 .as_ref()
-                .map(|source| source.data_connector.clone());
+                .map(|source| &source.data_connector);
             (
                 RelationshipTarget::Command {
                     command_name: qualified_target_command_name,
@@ -491,7 +485,7 @@ pub fn resolve_relationship(
     let target_capabilities = get_relationship_capabilities(
         &source_type_name,
         &relationship.name,
-        &source_data_connector,
+        source_data_connector,
         &target_name,
         data_connectors,
     )?;

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

@@ -58,7 +58,7 @@ pub fn resolve(
     {
         let qualified_type_name = Qualified::new(
             subgraph.to_string(),
-            output_type_permission.type_name.to_owned(),
+            output_type_permission.type_name.clone(),
         );
         match object_types_with_permissions.get_mut(&qualified_type_name) {
             None => {

v3/crates/metadata-resolve/src/types/subgraph.rs

@@ -100,7 +100,7 @@ where
     let map: BTreeMap<String, V> = Deserialize::deserialize(deserializer)?;
     let mut result = BTreeMap::new();
     for (key, value) in map {
-        let qualified = serde_json::from_str(&key.to_owned()).map_err(serde::de::Error::custom)?;
+        let qualified = serde_json::from_str(&key).map_err(serde::de::Error::custom)?;
         result.insert(qualified, value);
     }
     Ok(result)
@@ -135,7 +135,7 @@ where
     let map: BTreeMap<String, V> = Deserialize::deserialize(deserializer)?;
     let mut result = BTreeMap::new();
     for (key, value) in map {
-        let qualified = serde_json::from_str(&key.to_owned()).map_err(serde::de::Error::custom)?;
+        let qualified = serde_json::from_str(&key).map_err(serde::de::Error::custom)?;
         result.insert(qualified, value);
     }
     Ok(result)

v3/crates/schema/src/types/output_type.rs

@@ -454,7 +454,7 @@ pub fn output_type_schema(
                 global_id_fields: object_type_representation
                     .object_type
                     .global_id_fields
-                    .to_vec(),
+                    .clone(),
             }),
             get_output_type(gds, builder, &ID_TYPE_REFERENCE)?,
             BTreeMap::new(),