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# frozen_string_literal: true
module TableSchemaHelpers
def connection
ActiveRecord::Base.connection
end
def expect_table_to_be_replaced(original_table:, replacement_table:, archived_table:)
original_oid = table_oid(original_table)
replacement_oid = table_oid(replacement_table)
yield
expect(table_oid(original_table)).to eq(replacement_oid)
expect(table_oid(archived_table)).to eq(original_oid)
expect(table_oid(replacement_table)).to be_nil
end
def table_oid(name)
connection.select_value(<<~SQL)
SELECT oid
FROM pg_catalog.pg_class
WHERE relname = '#{name}'
SQL
end
def table_type(name)
connection.select_value(<<~SQL)
SELECT
CASE class.relkind
WHEN 'r' THEN 'normal'
WHEN 'p' THEN 'partitioned'
ELSE 'other'
END as table_type
FROM pg_catalog.pg_class class
WHERE class.relname = '#{name}'
SQL
end
def sequence_owned_by(table_name, column_name)
connection.select_value(<<~SQL)
SELECT
sequence.relname as name
FROM pg_catalog.pg_class as sequence
INNER JOIN pg_catalog.pg_depend depend
ON depend.objid = sequence.relfilenode
INNER JOIN pg_catalog.pg_class class
ON class.relfilenode = depend.refobjid
INNER JOIN pg_catalog.pg_attribute attribute
ON attribute.attnum = depend.refobjsubid
AND attribute.attrelid = depend.refobjid
WHERE class.relname = '#{table_name}'
AND attribute.attname = '#{column_name}'
SQL
end
def default_expression_for(table_name, column_name)
connection.select_value(<<~SQL)
SELECT
pg_get_expr(attrdef.adbin, attrdef.adrelid) AS default_value
FROM pg_catalog.pg_attribute attribute
INNER JOIN pg_catalog.pg_attrdef attrdef
ON attribute.attrelid = attrdef.adrelid
AND attribute.attnum = attrdef.adnum
WHERE attribute.attrelid = '#{table_name}'::regclass
AND attribute.attname = '#{column_name}'
SQL
end
def primary_key_constraint_name(table_name)
connection.select_value(<<~SQL)
SELECT
conname AS constraint_name
FROM pg_catalog.pg_constraint
WHERE conrelid = '#{table_name}'::regclass
AND contype = 'p'
SQL
end
end
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