made-core 0.8.0

Domain core of MADE: entities, value objects, events, ports. No IO.
Documentation 
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use serde::{Deserialize, Serialize};
use time::OffsetDateTime;

use crate::value_objects::{ContextPatch, StateIteration, StepAttempt, StepId, StepIteration};

/// A successful step atomically promoted declared output fields into context.
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct ContextWritten {
    pub step_id: StepId,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub state_visit: Option<crate::value_objects::StateVisit>,
    pub state_iteration: StateIteration,
    pub iteration: StepIteration,
    pub attempt: StepAttempt,
    pub patch: ContextPatch,
    #[serde(with = "time::serde::rfc3339")]
    pub written_at: OffsetDateTime,
}

impl ContextWritten {
    #[must_use]
    pub fn state_visit(&self) -> crate::value_objects::StateVisit {
        self.state_visit.unwrap_or_default()
    }
}