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use crate::catalog::table::Table;
use crate::diff::operations::{
ColumnAction, ColumnIdentifier, CommentOperation, ConstraintIdentifier, ConstraintOperation,
MigrationStep, TableOperation, TableTarget,
};
use crate::diff::{columns, diff_list};
pub fn diff(old: Option<&Table>, new: Option<&Table>) -> Vec<MigrationStep> {
match (old, new) {
(None, Some(n)) => {
let mut steps = vec![MigrationStep::Table(TableOperation::Create {
schema: n.schema.clone(),
name: n.name.clone(),
columns: n.columns.clone(),
primary_key: n.primary_key.clone(),
})];
if let Some(comment) = &n.comment {
steps.push(MigrationStep::Table(TableOperation::Comment(
CommentOperation::Set {
target: TableTarget {
schema: n.schema.clone(),
table: n.name.clone(),
},
comment: comment.clone(),
},
)));
}
for col in &n.columns {
if let Some(comment) = &col.comment {
steps.push(MigrationStep::Table(TableOperation::Alter {
schema: n.schema.clone(),
name: n.name.clone(),
actions: vec![ColumnAction::Comment(CommentOperation::Set {
target: ColumnIdentifier {
schema: n.schema.clone(),
table: n.name.clone(),
name: col.name.clone(),
},
comment: comment.clone(),
})],
}));
}
}
// Add primary key comment if present
if let Some(pk) = &n.primary_key
&& let Some(comment) = &pk.comment
{
steps.push(MigrationStep::Constraint(ConstraintOperation::Comment(
CommentOperation::Set {
target: ConstraintIdentifier {
schema: n.schema.clone(),
table_name: n.name.clone(),
name: pk.name.clone(),
},
comment: comment.clone(),
},
)));
}
// Add RLS settings if enabled
if n.rls_enabled {
steps.push(MigrationStep::Table(TableOperation::Alter {
schema: n.schema.clone(),
name: n.name.clone(),
actions: vec![ColumnAction::EnableRls],
}));
}
if n.rls_forced {
steps.push(MigrationStep::Table(TableOperation::Alter {
schema: n.schema.clone(),
name: n.name.clone(),
actions: vec![ColumnAction::ForceRls],
}));
}
steps
}
(Some(o), None) => {
vec![MigrationStep::Table(TableOperation::Drop {
schema: o.schema.clone(),
name: o.name.clone(),
})]
}
(Some(o), Some(n)) => {
let mut actions: Vec<ColumnAction> =
diff_list(&o.columns, &n.columns, |c| c.name.clone(), columns::diff);
match (&o.primary_key, &n.primary_key) {
(None, None) => {}
(Some(o_pk), Some(n_pk)) if o_pk == n_pk => {
// Primary keys are identical (including comment)
}
(None, Some(pk)) => {
actions.push(ColumnAction::AddPrimaryKey {
constraint: pk.clone(),
});
}
(Some(pk), None) => {
actions.push(ColumnAction::DropPrimaryKey {
name: pk.name.clone(),
});
}
(Some(o_pk), Some(n_pk)) => {
// Check if only the comment changed
let structure_same = o_pk.name == n_pk.name && o_pk.columns == n_pk.columns;
if structure_same && o_pk.comment != n_pk.comment {
// Only comment changed - handle separately below
} else {
// Structure changed - drop and recreate
actions.push(ColumnAction::DropPrimaryKey {
name: o_pk.name.clone(),
});
actions.push(ColumnAction::AddPrimaryKey {
constraint: n_pk.clone(),
});
}
}
}
// Check RLS settings changes
if o.rls_enabled != n.rls_enabled {
if n.rls_enabled {
actions.push(ColumnAction::EnableRls);
} else {
actions.push(ColumnAction::DisableRls);
}
}
if o.rls_forced != n.rls_forced {
if n.rls_forced {
actions.push(ColumnAction::ForceRls);
} else {
actions.push(ColumnAction::NoForceRls);
}
}
let mut steps = Vec::new();
if !actions.is_empty() {
steps.push(MigrationStep::Table(TableOperation::Alter {
schema: n.schema.clone(),
name: n.name.clone(),
actions,
}));
}
match (&o.comment, &n.comment) {
(None, Some(comment)) => {
steps.push(MigrationStep::Table(TableOperation::Comment(
CommentOperation::Set {
target: TableTarget {
schema: n.schema.clone(),
table: n.name.clone(),
},
comment: comment.clone(),
},
)));
}
(Some(_), None) => {
steps.push(MigrationStep::Table(TableOperation::Comment(
CommentOperation::Drop {
target: TableTarget {
schema: n.schema.clone(),
table: n.name.clone(),
},
},
)));
}
(Some(old_comment), Some(new_comment)) if old_comment != new_comment => {
steps.push(MigrationStep::Table(TableOperation::Comment(
CommentOperation::Set {
target: TableTarget {
schema: n.schema.clone(),
table: n.name.clone(),
},
comment: new_comment.clone(),
},
)));
}
_ => {}
}
// Handle primary key comment changes
match (&o.primary_key, &n.primary_key) {
(Some(o_pk), Some(n_pk))
if o_pk.name == n_pk.name
&& o_pk.columns == n_pk.columns
&& o_pk.comment != n_pk.comment =>
{
// Primary key structure is the same but comment changed
let identifier = ConstraintIdentifier {
schema: n.schema.clone(),
table_name: n.name.clone(),
name: n_pk.name.clone(),
};
match (&o_pk.comment, &n_pk.comment) {
(None, Some(comment)) => {
steps.push(MigrationStep::Constraint(ConstraintOperation::Comment(
CommentOperation::Set {
target: identifier,
comment: comment.clone(),
},
)));
}
(Some(_), None) => {
steps.push(MigrationStep::Constraint(ConstraintOperation::Comment(
CommentOperation::Drop { target: identifier },
)));
}
(Some(_), Some(comment)) => {
steps.push(MigrationStep::Constraint(ConstraintOperation::Comment(
CommentOperation::Set {
target: identifier,
comment: comment.clone(),
},
)));
}
_ => {}
}
}
_ => {}
}
for (old_col, new_col) in o.columns.iter().zip(n.columns.iter()) {
if old_col.name == new_col.name {
match (&old_col.comment, &new_col.comment) {
(None, Some(comment)) => {
steps.push(MigrationStep::Table(TableOperation::Alter {
schema: n.schema.clone(),
name: n.name.clone(),
actions: vec![ColumnAction::Comment(CommentOperation::Set {
target: ColumnIdentifier {
schema: n.schema.clone(),
table: n.name.clone(),
name: new_col.name.clone(),
},
comment: comment.clone(),
})],
}));
}
(Some(_), None) => {
steps.push(MigrationStep::Table(TableOperation::Alter {
schema: n.schema.clone(),
name: n.name.clone(),
actions: vec![ColumnAction::Comment(CommentOperation::Drop {
target: ColumnIdentifier {
schema: n.schema.clone(),
table: n.name.clone(),
name: new_col.name.clone(),
},
})],
}));
}
(Some(old_comment), Some(new_comment)) if old_comment != new_comment => {
steps.push(MigrationStep::Table(TableOperation::Alter {
schema: n.schema.clone(),
name: n.name.clone(),
actions: vec![ColumnAction::Comment(CommentOperation::Set {
target: ColumnIdentifier {
schema: n.schema.clone(),
table: n.name.clone(),
name: new_col.name.clone(),
},
comment: new_comment.clone(),
})],
}));
}
_ => {}
}
}
}
steps
}
_ => Vec::new(),
}
}