243 lines
6.3 KiB
Rust
243 lines
6.3 KiB
Rust
use crate::errors::MigraResult;
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use crate::managers::ManageMigrations;
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use std::iter::FromIterator;
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/// A simple wrap over string.
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#[derive(Debug, Clone, Default, PartialEq, Eq)]
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pub struct Migration {
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name: String,
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}
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impl Migration {
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/// Creates new migration by name.
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#[must_use]
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pub fn new(name: &str) -> Self {
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Migration {
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name: name.to_owned(),
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}
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}
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/// Returns name of migration.
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#[must_use]
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pub fn name(&self) -> &String {
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&self.name
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}
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}
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/// Wrap over migration vector. Can be implicitly converted to a vector and has
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/// a few of additional utilities for handling migrations.
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///
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/// Can be presented as a list of all migrations, a list of pending migrations
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/// or a list of applied migrations, depending on the implementation.
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///
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///
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///
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#[derive(Debug, Clone, Default, PartialEq, Eq)]
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pub struct List {
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inner: Vec<Migration>,
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}
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impl<T: AsRef<std::path::Path>> From<Vec<T>> for List {
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fn from(list: Vec<T>) -> Self {
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List {
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inner: list
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.iter()
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.map(AsRef::as_ref)
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.map(|path| {
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path.file_name()
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.and_then(std::ffi::OsStr::to_str)
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.expect("Cannot read migration name")
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})
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.map(Migration::new)
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.collect(),
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}
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}
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}
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impl From<Vec<Migration>> for List {
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fn from(list: Vec<Migration>) -> Self {
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List { inner: list }
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}
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}
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impl FromIterator<Migration> for List {
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fn from_iter<I: IntoIterator<Item = Migration>>(iter: I) -> Self {
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let mut list = List::new();
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for item in iter {
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list.push(item);
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}
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list
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}
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}
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impl<'a> FromIterator<&'a Migration> for List {
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fn from_iter<I: IntoIterator<Item = &'a Migration>>(iter: I) -> Self {
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let mut list = List::new();
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for item in iter {
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list.push(item.clone());
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}
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list
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}
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}
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impl std::ops::Deref for List {
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type Target = Vec<Migration>;
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fn deref(&self) -> &Self::Target {
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&self.inner
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}
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}
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impl List {
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/// Creates empty migration list.
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#[must_use]
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pub fn new() -> Self {
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List { inner: Vec::new() }
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}
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/// Push migration to list.
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pub fn push(&mut self, migration: Migration) {
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self.inner.push(migration)
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}
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/// Push migration name to list.
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///
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/// # Example
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///
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/// ```rust
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/// # use migra::migration::List;
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/// # let mut list = List::new();
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/// list.push_name("name");
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/// # assert_eq!(list, List::from(vec!["name"]));
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/// ```
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///
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/// Is identical to the following
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/// ```rust
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/// # use migra::migration::{List, Migration};
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/// # let mut list = List::new();
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/// list.push(Migration::new("name"));
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/// # assert_eq!(list, List::from(vec!["name"]));
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/// ```
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pub fn push_name(&mut self, name: &str) {
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self.inner.push(Migration::new(name))
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}
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/// Check if list contains specific migration.
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#[must_use]
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pub fn contains(&self, other_migration: &Migration) -> bool {
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self.inner
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.iter()
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.any(|migration| migration == other_migration)
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}
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/// Check if list contains migration with specific name.
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#[must_use]
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pub fn contains_name(&self, name: &str) -> bool {
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self.inner.iter().any(|migration| migration.name() == name)
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}
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/// Exclude specific list from current list.
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#[must_use]
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pub fn exclude(&self, list: &List) -> List {
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self.inner
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.iter()
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.filter(|migration| !list.contains_name(migration.name()))
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.collect()
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}
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/// Runs a upgrade migration with SQL content and adds a new migration to the current list
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/// If there is no migration migration with specific name in the list.
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pub fn should_run_upgrade_migration(
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&mut self,
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client: &mut dyn ManageMigrations,
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name: &str,
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content: &str,
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) -> MigraResult<bool> {
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let is_missed = !self.contains_name(name);
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if is_missed {
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client.run_upgrade_migration(name, content)?;
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self.push_name(name);
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}
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Ok(is_missed)
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}
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/// Runs a downgrade migration with SQL content and removes the last migration from the
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/// current list if the last item in the list has the specified name.
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pub fn should_run_downgrade_migration(
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&mut self,
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client: &mut dyn ManageMigrations,
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name: &str,
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content: &str,
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) -> MigraResult<bool> {
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let is_latest = self.inner.last() == Some(&Migration::new(name));
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if is_latest {
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client.run_downgrade_migration(name, content)?;
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self.inner.pop();
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}
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Ok(is_latest)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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const FIRST_MIGRATION: &str = "initial_migration";
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const SECOND_MIGRATION: &str = "new_migration";
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#[test]
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fn push_migration_to_list() {
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let mut list = List::new();
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list.push(Migration::new(FIRST_MIGRATION));
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assert_eq!(list, List::from(vec![FIRST_MIGRATION]));
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list.push(Migration::new(SECOND_MIGRATION));
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assert_eq!(list, List::from(vec![FIRST_MIGRATION, SECOND_MIGRATION]))
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}
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#[test]
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fn push_name_to_list() {
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let mut list = List::new();
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list.push_name(FIRST_MIGRATION);
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assert_eq!(list, List::from(vec![FIRST_MIGRATION]));
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list.push_name(&String::from(SECOND_MIGRATION));
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assert_eq!(list, List::from(vec![FIRST_MIGRATION, SECOND_MIGRATION]))
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}
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#[test]
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fn contains_migration() {
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let list = List::from(vec![FIRST_MIGRATION]);
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assert_eq!(list.contains(&Migration::new(FIRST_MIGRATION)), true);
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assert_eq!(list.contains(&Migration::new(SECOND_MIGRATION)), false);
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}
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#[test]
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fn contains_migration_name() {
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let list = List::from(vec![FIRST_MIGRATION]);
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assert_eq!(list.contains_name(FIRST_MIGRATION), true);
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assert_eq!(list.contains_name(SECOND_MIGRATION), false);
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}
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#[test]
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fn create_excluded_migration_list() {
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let all_migrations = List::from(vec![FIRST_MIGRATION, SECOND_MIGRATION]);
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let applied_migrations = List::from(vec![FIRST_MIGRATION]);
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let excluded = all_migrations.exclude(&applied_migrations);
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assert_eq!(excluded, List::from(vec![SECOND_MIGRATION]))
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}
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}
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