hash_assertions

Hash assertions: assert required keys, assert keys with values

Installation

Add this line to your application's Gemfile:

gem "hash_assertions"

And then execute:

$ bundle

Or install it yourself as:

$ gem install hash_assertions

and require it:

require "hash_assertions"

Usage

assert_required_keys

require "hash_assertions/assert_required_keys"

# Raises nothing
{ foo: "bar", baz: "qux" }.assert_required_keys(:foo, :baz)

# Raises ArgumentError, "Missing required key: baz"
{ foo: "bar" }.assert_required_keys(:foo, :baz)

# Raises ArgumentError, "Missing required key: baz"
{ foo: "bar", baz: "qux" }.assert_required_keys(:foo, "baz")

# Raises ArgumentError, "Missing required key: [:foo, :baz]"
# (assert_required_keys doesn't flatten arguments!)
{ foo: "bar", baz: "qux" }.assert_required_keys([:foo, :baz])

assert_keys_with_values

require "hash_assertions/assert_keys_with_values"

# Raises nothing
{ foo: "bar", baz: "qux" }.assert_keys_with_values(:foo, :baz)

# Raises nothing
# (blank string or empty array is treated as valid value)
{ foo: "bar", baz: "" }.assert_keys_with_values(:foo, :baz)

# Raises ArgumentError, "No value for key: baz"
{ foo: "bar", baz: nil }.assert_keys_with_values(:foo, :baz)

# Raises ArgumentError, "No value for key: baz"
{ foo: "bar", baz: "qux" }.assert_keys_with_values(:foo, "baz")

# Raises ArgumentError, "No value for key: [:foo, :baz]"
# (assert_keys_with_values doesn't flatten arguments!)
{ foo: "bar", baz: "qux" }.assert_keys_with_values([:foo, :baz])

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request