Retrieves a changeset from a transaction result.

Examples

iex> get_changeset_from_transaction({:ok, %{user: user}}, :user)
{:ok, %User{}}

iex> get_changeset_from_transaction({:error, :user, changeset, _}, :user)
{:error, %Ecto.Changeset{}}

Conditionally puts a key-value pair into a map.

Returns the map unchanged if the value is nil or an empty string. Otherwise, adds the key-value pair to the map.

Examples

iex> maybe_put(%{}, "key", "value")
%{"key" => "value"}

iex> maybe_put(%{"existing" => "data"}, "key", "value")
%{"existing" => "data", "key" => "value"}

iex> maybe_put(%{}, "key", nil)
%{}

iex> maybe_put(%{}, "key", "")
%{}

Remove accents from a string.

Examples

iex> remove_accents("Café")
"Cafe"

iex> remove_accents("Crème brûlée")
"Creme brulee"

iex> remove_accents("naïve")
"naive"

Converts a string to an existing atom.

Returns nil if the atom doesn't exist instead of raising an error.

Examples

iex> to_existing_atom("catalog")
:catalog

iex> to_existing_atom("non_existent_atom")
nil

iex> to_existing_atom(nil)
nil

Decodes a URL-safe Base64 encoded token and applies a function to the decoded result.

This helper is useful for handling encoded tokens in authentication flows, particularly for session tokens that need to be decoded before use.

Parameters

• token - The Base64 URL-encoded token string
• fun - A function to apply to the successfully decoded token
• error_value - The value to return on decoding error (default: :error)

Returns

• The result of applying fun to the decoded token if decoding is successful
• error_value if the token cannot be decoded

Examples

iex> with_decoded_token("c29tZV90b2tlbg==", &String.upcase/1)
"SOME_TOKEN"

iex> with_decoded_token("invalid+token", &String.upcase/1)
:error

iex> with_decoded_token("invalid+token", &String.upcase/1, nil)
nil