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introspection.rs
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introspection.rs
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use crate::introspection_helpers::{
calculate_backrelation_field, calculate_index, calculate_many_to_many_field, calculate_relation_field,
calculate_scalar_field, is_new_migration_table, is_old_migration_table, is_prisma_1_point_0_join_table,
is_prisma_1_point_1_or_2_join_table, is_relay_table,
};
use crate::version_checker::VersionChecker;
use crate::Dedup;
use crate::SqlError;
use datamodel::{dml, walkers::find_model_by_db_name, Datamodel, Field, Model, RelationField};
use quaint::connector::SqlFamily;
use sql_schema_describer::{SqlSchema, Table};
use tracing::debug;
pub fn introspect(
schema: &SqlSchema,
version_check: &mut VersionChecker,
data_model: &mut Datamodel,
sql_family: SqlFamily,
) -> Result<(), SqlError> {
for table in schema
.tables
.iter()
.filter(|table| !is_old_migration_table(&table))
.filter(|table| !is_new_migration_table(&table))
.filter(|table| !is_prisma_1_point_1_or_2_join_table(&table))
.filter(|table| !is_prisma_1_point_0_join_table(&table))
.filter(|table| !is_relay_table(&table))
{
debug!("Calculating model: {}", table.name);
let mut model = Model::new(table.name.clone(), None);
for column in &table.columns {
version_check.check_column_for_type_and_default_value(&column);
let field = calculate_scalar_field(&table, &column, &sql_family);
model.add_field(Field::ScalarField(field));
}
let mut foreign_keys_copy = table.foreign_keys.clone();
foreign_keys_copy.clear_duplicates();
for foreign_key in &foreign_keys_copy {
version_check.has_inline_relations(table);
version_check.uses_on_delete(foreign_key, table);
let mut relation_field = calculate_relation_field(schema, table, foreign_key)?;
relation_field.supports_restrict_action(!sql_family.is_mssql());
model.add_field(Field::RelationField(relation_field));
}
for index in table
.indices
.iter()
.filter(|i| !(i.columns.len() == 1 && i.is_unique()))
{
model.add_index(calculate_index(index));
}
if table.primary_key_columns().len() > 1 {
model.id_fields = table.primary_key_columns();
}
version_check.always_has_created_at_updated_at(table, &model);
version_check.has_p1_compatible_primary_key_column(table);
data_model.add_model(model);
}
for e in schema.enums.iter() {
let values = e.values.iter().map(|v| dml::EnumValue::new(v)).collect();
data_model.add_enum(dml::Enum::new(&e.name, values));
}
let mut fields_to_be_added = Vec::new();
// add backrelation fields
for model in data_model.models() {
for relation_field in model.relation_fields() {
let relation_info = &relation_field.relation_info;
if data_model
.find_related_field_for_info(&relation_info, &relation_field.name)
.is_none()
{
let other_model = data_model.find_model(&relation_info.to).unwrap();
let field = calculate_backrelation_field(schema, model, other_model, relation_field, relation_info)?;
fields_to_be_added.push((other_model.name.clone(), field));
}
}
}
// add prisma many to many relation fields
for table in schema
.tables
.iter()
.filter(|table| is_prisma_1_point_1_or_2_join_table(&table) || is_prisma_1_point_0_join_table(&table))
{
calculate_fields_for_prisma_join_table(&table, &mut fields_to_be_added, data_model)
}
for (model, field) in fields_to_be_added {
data_model.find_model_mut(&model).add_field(Field::RelationField(field));
}
Ok(())
}
fn calculate_fields_for_prisma_join_table(
join_table: &Table,
fields_to_be_added: &mut Vec<(String, RelationField)>,
data_model: &mut Datamodel,
) {
if let (Some(fk_a), Some(fk_b)) = (join_table.foreign_keys.get(0), join_table.foreign_keys.get(1)) {
let is_self_relation = fk_a.referenced_table == fk_b.referenced_table;
for (fk, opposite_fk) in &[(fk_a, fk_b), (fk_b, fk_a)] {
let referenced_model = find_model_by_db_name(&data_model, &fk.referenced_table)
.expect("Could not find model referenced in relation table.");
let mut existing_relations = fields_to_be_added
.iter()
.filter(|(model_name, _)| model_name.as_str() == referenced_model.name())
.map(|(_, relation_field)| relation_field.relation_info.name.as_str())
.chain(
referenced_model
.relation_fields()
.map(|relation_field| relation_field.relation_name()),
);
// Avoid duplicate field names, in case a generated relation field name is the same as the M2M relation table's name.
let relation_name = &join_table.name[1..];
let relation_name = if !is_self_relation
&& existing_relations.any(|existing_relation| existing_relation == relation_name)
{
format!("{}ManyToMany", relation_name)
} else {
relation_name.to_owned()
};
let field = calculate_many_to_many_field(opposite_fk, relation_name, is_self_relation);
fields_to_be_added.push((referenced_model.name().to_owned(), field));
}
}
}