Created
July 17, 2020 23:45
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#blog_snippets
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| defp mathematical_validation(changeset) do | |
| revenue = get_field(changeset, :revenue) | |
| expense = get_field(changeset, :expense) | |
| net_gain = get_field(changeset, :net_gain) | |
| with true <- revenue != nil, | |
| true <- expense != nil, | |
| true <- net_gain != nil, | |
| true <- Decimal.sub(revenue, expense) == Decimal.new(net_gain) do | |
| changeset | |
| else | |
| _ -> add_error(changeset, :net_gain, "must equal revenue minus expense") | |
| end | |
| end |
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