Enum aws_sdk_dynamodb::model::Select

#[non_exhaustive]
pub enum Select {
    AllAttributes,
    AllProjectedAttributes,
    Count,
    SpecificAttributes,
    Unknown(UnknownVariantValue),
}

When writing a match expression against Select, it is important to ensure your code is forward-compatible. That is, if a match arm handles a case for a feature that is supported by the service but has not been represented as an enum variant in a current version of SDK, your code should continue to work when you upgrade SDK to a future version in which the enum does include a variant for that feature.

Here is an example of how you can make a match expression forward-compatible:

# let select = unimplemented!();
match select {
    Select::AllAttributes => { /* ... */ },
    Select::AllProjectedAttributes => { /* ... */ },
    Select::Count => { /* ... */ },
    Select::SpecificAttributes => { /* ... */ },
    other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
    _ => { /* ... */ },
}

The above code demonstrates that when select represents NewFeature, the execution path will lead to the second last match arm, even though the enum does not contain a variant Select::NewFeature in the current version of SDK. The reason is that the variable other, created by the @ operator, is bound to Select::Unknown(UnknownVariantValue("NewFeature".to_owned())) and calling as_str on it yields "NewFeature". This match expression is forward-compatible when executed with a newer version of SDK where the variant Select::NewFeature is defined. Specifically, when select represents NewFeature, the execution path will hit the second last match arm as before by virtue of calling as_str on Select::NewFeature also yielding "NewFeature".

Explicitly matching on the Unknown variant should be avoided for two reasons:

• The inner data UnknownVariantValue is opaque, and no further information can be extracted.
• It might inadvertently shadow other intended match arms.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

AllAttributes

AllProjectedAttributes

Count

SpecificAttributes

Unknown(UnknownVariantValue)

Unknown contains new variants that have been added since this code was generated.

Implementations

impl Select

pub fn as_str(&self) -> &str

Returns the &str value of the enum member.

Examples found in repository

src/model.rs (line 12003)

    fn as_ref(&self) -> &str {
        self.as_str()
    }

src/json_ser.rs (line 929)

pub fn serialize_structure_crate_input_query_input(
    object: &mut aws_smithy_json::serialize::JsonObjectWriter,
    input: &crate::input::QueryInput,
) -> Result<(), aws_smithy_http::operation::error::SerializationError> {
    if let Some(var_195) = &input.table_name {
        object.key("TableName").string(var_195.as_str());
    }
    if let Some(var_196) = &input.index_name {
        object.key("IndexName").string(var_196.as_str());
    }
    if let Some(var_197) = &input.select {
        object.key("Select").string(var_197.as_str());
    }
    if let Some(var_198) = &input.attributes_to_get {
        let mut array_199 = object.key("AttributesToGet").start_array();
        for item_200 in var_198 {
            {
                array_199.value().string(item_200.as_str());
            }
        }
        array_199.finish();
    }
    if let Some(var_201) = &input.limit {
        object.key("Limit").number(
            #[allow(clippy::useless_conversion)]
            aws_smithy_types::Number::NegInt((*var_201).into()),
        );
    }
    if let Some(var_202) = &input.consistent_read {
        object.key("ConsistentRead").boolean(*var_202);
    }
    if let Some(var_203) = &input.key_conditions {
        #[allow(unused_mut)]
        let mut object_204 = object.key("KeyConditions").start_object();
        for (key_205, value_206) in var_203 {
            {
                #[allow(unused_mut)]
                let mut object_207 = object_204.key(key_205.as_str()).start_object();
                crate::json_ser::serialize_structure_crate_model_condition(
                    &mut object_207,
                    value_206,
                )?;
                object_207.finish();
            }
        }
        object_204.finish();
    }
    if let Some(var_208) = &input.query_filter {
        #[allow(unused_mut)]
        let mut object_209 = object.key("QueryFilter").start_object();
        for (key_210, value_211) in var_208 {
            {
                #[allow(unused_mut)]
                let mut object_212 = object_209.key(key_210.as_str()).start_object();
                crate::json_ser::serialize_structure_crate_model_condition(
                    &mut object_212,
                    value_211,
                )?;
                object_212.finish();
            }
        }
        object_209.finish();
    }
    if let Some(var_213) = &input.conditional_operator {
        object.key("ConditionalOperator").string(var_213.as_str());
    }
    if let Some(var_214) = &input.scan_index_forward {
        object.key("ScanIndexForward").boolean(*var_214);
    }
    if let Some(var_215) = &input.exclusive_start_key {
        #[allow(unused_mut)]
        let mut object_216 = object.key("ExclusiveStartKey").start_object();
        for (key_217, value_218) in var_215 {
            {
                #[allow(unused_mut)]
                let mut object_219 = object_216.key(key_217.as_str()).start_object();
                crate::json_ser::serialize_union_crate_model_attribute_value(
                    &mut object_219,
                    value_218,
                )?;
                object_219.finish();
            }
        }
        object_216.finish();
    }
    if let Some(var_220) = &input.return_consumed_capacity {
        object
            .key("ReturnConsumedCapacity")
            .string(var_220.as_str());
    }
    if let Some(var_221) = &input.projection_expression {
        object.key("ProjectionExpression").string(var_221.as_str());
    }
    if let Some(var_222) = &input.filter_expression {
        object.key("FilterExpression").string(var_222.as_str());
    }
    if let Some(var_223) = &input.key_condition_expression {
        object
            .key("KeyConditionExpression")
            .string(var_223.as_str());
    }
    if let Some(var_224) = &input.expression_attribute_names {
        #[allow(unused_mut)]
        let mut object_225 = object.key("ExpressionAttributeNames").start_object();
        for (key_226, value_227) in var_224 {
            {
                object_225.key(key_226.as_str()).string(value_227.as_str());
            }
        }
        object_225.finish();
    }
    if let Some(var_228) = &input.expression_attribute_values {
        #[allow(unused_mut)]
        let mut object_229 = object.key("ExpressionAttributeValues").start_object();
        for (key_230, value_231) in var_228 {
            {
                #[allow(unused_mut)]
                let mut object_232 = object_229.key(key_230.as_str()).start_object();
                crate::json_ser::serialize_union_crate_model_attribute_value(
                    &mut object_232,
                    value_231,
                )?;
                object_232.finish();
            }
        }
        object_229.finish();
    }
    Ok(())
}

pub fn serialize_structure_crate_input_restore_table_from_backup_input(
    object: &mut aws_smithy_json::serialize::JsonObjectWriter,
    input: &crate::input::RestoreTableFromBackupInput,
) -> Result<(), aws_smithy_http::operation::error::SerializationError> {
    if let Some(var_233) = &input.target_table_name {
        object.key("TargetTableName").string(var_233.as_str());
    }
    if let Some(var_234) = &input.backup_arn {
        object.key("BackupArn").string(var_234.as_str());
    }
    if let Some(var_235) = &input.billing_mode_override {
        object.key("BillingModeOverride").string(var_235.as_str());
    }
    if let Some(var_236) = &input.global_secondary_index_override {
        let mut array_237 = object.key("GlobalSecondaryIndexOverride").start_array();
        for item_238 in var_236 {
            {
                #[allow(unused_mut)]
                let mut object_239 = array_237.value().start_object();
                crate::json_ser::serialize_structure_crate_model_global_secondary_index(
                    &mut object_239,
                    item_238,
                )?;
                object_239.finish();
            }
        }
        array_237.finish();
    }
    if let Some(var_240) = &input.local_secondary_index_override {
        let mut array_241 = object.key("LocalSecondaryIndexOverride").start_array();
        for item_242 in var_240 {
            {
                #[allow(unused_mut)]
                let mut object_243 = array_241.value().start_object();
                crate::json_ser::serialize_structure_crate_model_local_secondary_index(
                    &mut object_243,
                    item_242,
                )?;
                object_243.finish();
            }
        }
        array_241.finish();
    }
    if let Some(var_244) = &input.provisioned_throughput_override {
        #[allow(unused_mut)]
        let mut object_245 = object.key("ProvisionedThroughputOverride").start_object();
        crate::json_ser::serialize_structure_crate_model_provisioned_throughput(
            &mut object_245,
            var_244,
        )?;
        object_245.finish();
    }
    if let Some(var_246) = &input.sse_specification_override {
        #[allow(unused_mut)]
        let mut object_247 = object.key("SSESpecificationOverride").start_object();
        crate::json_ser::serialize_structure_crate_model_sse_specification(
            &mut object_247,
            var_246,
        )?;
        object_247.finish();
    }
    Ok(())
}

pub fn serialize_structure_crate_input_restore_table_to_point_in_time_input(
    object: &mut aws_smithy_json::serialize::JsonObjectWriter,
    input: &crate::input::RestoreTableToPointInTimeInput,
) -> Result<(), aws_smithy_http::operation::error::SerializationError> {
    if let Some(var_248) = &input.source_table_arn {
        object.key("SourceTableArn").string(var_248.as_str());
    }
    if let Some(var_249) = &input.source_table_name {
        object.key("SourceTableName").string(var_249.as_str());
    }
    if let Some(var_250) = &input.target_table_name {
        object.key("TargetTableName").string(var_250.as_str());
    }
    if let Some(var_251) = &input.use_latest_restorable_time {
        object.key("UseLatestRestorableTime").boolean(*var_251);
    }
    if let Some(var_252) = &input.restore_date_time {
        object
            .key("RestoreDateTime")
            .date_time(var_252, aws_smithy_types::date_time::Format::EpochSeconds)?;
    }
    if let Some(var_253) = &input.billing_mode_override {
        object.key("BillingModeOverride").string(var_253.as_str());
    }
    if let Some(var_254) = &input.global_secondary_index_override {
        let mut array_255 = object.key("GlobalSecondaryIndexOverride").start_array();
        for item_256 in var_254 {
            {
                #[allow(unused_mut)]
                let mut object_257 = array_255.value().start_object();
                crate::json_ser::serialize_structure_crate_model_global_secondary_index(
                    &mut object_257,
                    item_256,
                )?;
                object_257.finish();
            }
        }
        array_255.finish();
    }
    if let Some(var_258) = &input.local_secondary_index_override {
        let mut array_259 = object.key("LocalSecondaryIndexOverride").start_array();
        for item_260 in var_258 {
            {
                #[allow(unused_mut)]
                let mut object_261 = array_259.value().start_object();
                crate::json_ser::serialize_structure_crate_model_local_secondary_index(
                    &mut object_261,
                    item_260,
                )?;
                object_261.finish();
            }
        }
        array_259.finish();
    }
    if let Some(var_262) = &input.provisioned_throughput_override {
        #[allow(unused_mut)]
        let mut object_263 = object.key("ProvisionedThroughputOverride").start_object();
        crate::json_ser::serialize_structure_crate_model_provisioned_throughput(
            &mut object_263,
            var_262,
        )?;
        object_263.finish();
    }
    if let Some(var_264) = &input.sse_specification_override {
        #[allow(unused_mut)]
        let mut object_265 = object.key("SSESpecificationOverride").start_object();
        crate::json_ser::serialize_structure_crate_model_sse_specification(
            &mut object_265,
            var_264,
        )?;
        object_265.finish();
    }
    Ok(())
}

pub fn serialize_structure_crate_input_scan_input(
    object: &mut aws_smithy_json::serialize::JsonObjectWriter,
    input: &crate::input::ScanInput,
) -> Result<(), aws_smithy_http::operation::error::SerializationError> {
    if let Some(var_266) = &input.table_name {
        object.key("TableName").string(var_266.as_str());
    }
    if let Some(var_267) = &input.index_name {
        object.key("IndexName").string(var_267.as_str());
    }
    if let Some(var_268) = &input.attributes_to_get {
        let mut array_269 = object.key("AttributesToGet").start_array();
        for item_270 in var_268 {
            {
                array_269.value().string(item_270.as_str());
            }
        }
        array_269.finish();
    }
    if let Some(var_271) = &input.limit {
        object.key("Limit").number(
            #[allow(clippy::useless_conversion)]
            aws_smithy_types::Number::NegInt((*var_271).into()),
        );
    }
    if let Some(var_272) = &input.select {
        object.key("Select").string(var_272.as_str());
    }
    if let Some(var_273) = &input.scan_filter {
        #[allow(unused_mut)]
        let mut object_274 = object.key("ScanFilter").start_object();
        for (key_275, value_276) in var_273 {
            {
                #[allow(unused_mut)]
                let mut object_277 = object_274.key(key_275.as_str()).start_object();
                crate::json_ser::serialize_structure_crate_model_condition(
                    &mut object_277,
                    value_276,
                )?;
                object_277.finish();
            }
        }
        object_274.finish();
    }
    if let Some(var_278) = &input.conditional_operator {
        object.key("ConditionalOperator").string(var_278.as_str());
    }
    if let Some(var_279) = &input.exclusive_start_key {
        #[allow(unused_mut)]
        let mut object_280 = object.key("ExclusiveStartKey").start_object();
        for (key_281, value_282) in var_279 {
            {
                #[allow(unused_mut)]
                let mut object_283 = object_280.key(key_281.as_str()).start_object();
                crate::json_ser::serialize_union_crate_model_attribute_value(
                    &mut object_283,
                    value_282,
                )?;
                object_283.finish();
            }
        }
        object_280.finish();
    }
    if let Some(var_284) = &input.return_consumed_capacity {
        object
            .key("ReturnConsumedCapacity")
            .string(var_284.as_str());
    }
    if let Some(var_285) = &input.total_segments {
        object.key("TotalSegments").number(
            #[allow(clippy::useless_conversion)]
            aws_smithy_types::Number::NegInt((*var_285).into()),
        );
    }
    if let Some(var_286) = &input.segment {
        object.key("Segment").number(
            #[allow(clippy::useless_conversion)]
            aws_smithy_types::Number::NegInt((*var_286).into()),
        );
    }
    if let Some(var_287) = &input.projection_expression {
        object.key("ProjectionExpression").string(var_287.as_str());
    }
    if let Some(var_288) = &input.filter_expression {
        object.key("FilterExpression").string(var_288.as_str());
    }
    if let Some(var_289) = &input.expression_attribute_names {
        #[allow(unused_mut)]
        let mut object_290 = object.key("ExpressionAttributeNames").start_object();
        for (key_291, value_292) in var_289 {
            {
                object_290.key(key_291.as_str()).string(value_292.as_str());
            }
        }
        object_290.finish();
    }
    if let Some(var_293) = &input.expression_attribute_values {
        #[allow(unused_mut)]
        let mut object_294 = object.key("ExpressionAttributeValues").start_object();
        for (key_295, value_296) in var_293 {
            {
                #[allow(unused_mut)]
                let mut object_297 = object_294.key(key_295.as_str()).start_object();
                crate::json_ser::serialize_union_crate_model_attribute_value(
                    &mut object_297,
                    value_296,
                )?;
                object_297.finish();
            }
        }
        object_294.finish();
    }
    if let Some(var_298) = &input.consistent_read {
        object.key("ConsistentRead").boolean(*var_298);
    }
    Ok(())
}

pub const fn values() -> &'static [&'static str]

Returns all the &str values of the enum members.

Trait Implementations

impl AsRef<str> for Select

fn as_ref(&self) -> &str

Converts this type into a shared reference of the (usually inferred) input type.

impl Clone for Select

fn clone(&self) -> Select

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Select

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<&str> for Select

fn from(s: &str) -> Self

Converts to this type from the input type.

impl FromStr for Select

type Err = Infallible

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Hash for Select

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where
    H: Hasher,
    Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Select

fn cmp(&self, other: &Select) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Selfwhere
    Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Selfwhere
    Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere
    Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval.

impl PartialEq<Select> for Select

fn eq(&self, other: &Select) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd<Select> for Select

fn partial_cmp(&self, other: &Select) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for Select

impl StructuralEq for Select

impl StructuralPartialEq for Select