Add rule 'rails_migrations_pending'

README.md

@@ -303,6 +303,7 @@ following rules are enabled by default:
 * `python_module_error` – fixes ModuleNotFoundError by trying to `pip install` that module;
 * `quotation_marks` – fixes uneven usage of `'` and `"` when containing args';
 * `path_from_history` – replaces not found path with a similar absolute path from history;
+* `rails_migrations_pending` – runs pending migrations;
 * `react_native_command_unrecognized` – fixes unrecognized `react-native` commands;
 * `remove_shell_prompt_literal` – remove leading shell prompt symbol `$`, common when copying commands from documentations;
 * `remove_trailing_cedilla` – remove trailing cedillas `ç`, a common typo for European keyboard layouts;

tests/rules/test_rails_migrations_pending.py

@@ -0,0 +1,46 @@
+import pytest
+from thefuck.rules.rails_migrations_pending import match, get_new_command
+from thefuck.types import Command
+
+output_env_development = '''
+Migrations are pending. To resolve this issue, run:
+
+        rails db:migrate RAILS_ENV=development
+'''
+output_env_test = '''
+Migrations are pending. To resolve this issue, run:
+
+        bin/rails db:migrate RAILS_ENV=test
+'''
+
+
+@pytest.mark.parametrize(
+    "command",
+    [
+        Command("", output_env_development),
+        Command("", output_env_test),
+    ],
+)
+def test_match(command):
+    assert match(command)
+
+
+@pytest.mark.parametrize(
+    "command",
+    [
+        Command("Environment data not found in the schema. To resolve this issue, run: \n\n", ""),
+    ],
+)
+def test_not_match(command):
+    assert not match(command)
+
+
+@pytest.mark.parametrize(
+    "command, new_command",
+    [
+        (Command("bin/rspec", output_env_development), "rails db:migrate RAILS_ENV=development && bin/rspec"),
+        (Command("bin/rspec", output_env_test), "bin/rails db:migrate RAILS_ENV=test && bin/rspec"),
+    ],
+)
+def test_get_new_command(command, new_command):
+    assert get_new_command(command) == new_command

thefuck/rules/rails_migrations_pending.py

@@ -0,0 +1,14 @@
+import re
+from thefuck.shells import shell
+
+
+SUGGESTION_REGEX = r"To resolve this issue, run:\s+(.*?)\n"
+
+
+def match(command):
+    return "Migrations are pending. To resolve this issue, run:" in command.output
+
+
+def get_new_command(command):
+    migration_script = re.search(SUGGESTION_REGEX, command.output).group(1)
+    return shell.and_(migration_script, command.script)