Struct Observation 

pub struct Observation {
    pub realtime_start: NaiveDate,
    pub realtime_end: NaiveDate,
    pub date: NaiveDate,
    pub value: Option<f64>,
}

A single observation in a FRED series: a calendar date, its value, and the real-time period that value was current for (ALFRED — ADR-0024).

FRED transmits the value as a string and encodes a missing value as the sentinel ".", which maps to None. Any other value parses to Some(f64); a non-"." value that fails to parse is a deserialization error, not a silent None (see ADR-0004 and ADR-0005).

realtime_start / realtime_end bound the period the value was the current one — the ALFRED dimension. For a plain latest query FRED returns today for both; a point-in-time or vintage_dates query returns the period the archived value held.

On serialization the value is emitted as a JSON number or null — typed JSON for consumers, not FRED’s stringly-typed "." wire format.

Fields

realtime_start: NaiveDate

Start of the real-time period this value was current for (ALFRED). Equal to today for a latest query; the archived vintage’s start otherwise.

realtime_end: NaiveDate

End of the real-time period this value was current for (ALFRED). Equal to today for a latest query; the archived vintage’s end otherwise.

date: NaiveDate

The observation date. FRED dates are calendar dates with no time or zone, which NaiveDate models exactly.

value: Option<f64>

The observation value; None when FRED reports it as missing (".").

Trait Implementations

impl Clone for Observation

fn clone(&self) -> Observation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Observation

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Observation

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Observation

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl Serialize for Observation

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Observation