pgmt 0.4.8

PostgreSQL migration tool that keeps your schema files as the source of truth
Documentation 
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//! Type operations for schema migrations

use super::OperationKind;
use super::comments::{CommentOperation, CommentTarget};
use crate::catalog::id::DbObjectId;
use crate::render::quote_ident;

#[derive(Debug, Clone)]
pub enum TypeOperation {
    Create {
        schema: String,
        name: String,
        kind: String,
        definition: String,
    },
    Drop {
        schema: String,
        name: String,
    },
    Alter {
        schema: String,
        name: String,
        action: String,
        definition: String,
    },
    Comment(CommentOperation<TypeIdentifier>),
    AttributeComment(CommentOperation<CompositeAttributeIdentifier>),
}

impl TypeOperation {
    pub fn operation_kind(&self) -> OperationKind {
        match self {
            Self::Create { .. } => OperationKind::Create,
            Self::Drop { .. } => OperationKind::Drop,
            Self::Alter { .. } => OperationKind::Alter,
            Self::Comment(_) => OperationKind::Alter,
            Self::AttributeComment(_) => OperationKind::Alter,
        }
    }
}

#[derive(Debug, Clone)]
pub struct TypeIdentifier {
    pub schema: String,
    pub name: String,
}

impl CommentTarget for TypeIdentifier {
    const OBJECT_TYPE: &'static str = "TYPE";

    fn identifier(&self) -> String {
        format!("{}.{}", quote_ident(&self.schema), quote_ident(&self.name))
    }

    fn db_object_id(&self) -> DbObjectId {
        DbObjectId::Type {
            schema: self.schema.clone(),
            name: self.name.clone(),
        }
    }
}

#[derive(Debug, Clone)]
pub struct CompositeAttributeIdentifier {
    pub schema: String,
    pub type_name: String,
    pub attribute: String,
}

impl CommentTarget for CompositeAttributeIdentifier {
    // PostgreSQL syntax: COMMENT ON COLUMN <type>.<attr> IS ...
    const OBJECT_TYPE: &'static str = "COLUMN";

    fn identifier(&self) -> String {
        format!(
            "{}.{}.{}",
            quote_ident(&self.schema),
            quote_ident(&self.type_name),
            quote_ident(&self.attribute)
        )
    }

    fn db_object_id(&self) -> DbObjectId {
        DbObjectId::Type {
            schema: self.schema.clone(),
            name: self.type_name.clone(),
        }
    }
}