Change the get function to let user find country by name #56
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pedromcorreia
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ghost
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lib/countries.ex
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| """ | ||
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| def get(country_code) do | ||
| [country] = filter_by(:alpha2, country_code) | ||
| def get(attrs) when bit_size(attrs) == 16 do |
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Could you rename this function to get_by_alpha2
pedromcorreia
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ghost
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| case length(country) do | ||
| 0 -> | ||
| [] |
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The returned value is not consistent and breaking the current API.
We could update it to adopt the following pattern:
{:ok, country}
:not_found pattern
And also add a get! function that breaks if country does not exist.
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Indeed, you can change the whole case in this way:
case country do
[] -> []
[country_info | _] -> country_info
end
| iex> name | ||
| "Poland" | ||
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| """ | ||
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| def get(country_code) do | ||
| [country] = filter_by(:alpha2, country_code) | ||
| def get_by_alpha2(attrs) when bit_size(attrs) == 16 do |
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because you're using a strong match, you should add a ! indicating that if the country isn't found it's going to fail.
def get_by_alpha2!(<<_ :: binary-size(16)>> = attrs) do
hd(filter_by(:alpha2, attrs))
end
def get_by_alpha2(<<_ :: binary-size(16)>> = attrs) do
case filter_by(:alpha2, attrs) do
[] -> nil
[country] -> country
end
end
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Description
Change the function get to use guard, this allows users to find countries by name and returning only one record.