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0.1.0
The PostgreSQL data layer for Ash Framework
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lib/functions/trigram_similarity.ex
defmodule AshPostgres.Functions.TrigramSimilarity do
@moduledoc """
A filter predicate that filters based on trigram similarity.
See the postgres docs on [https://www.postgresql.org/docs/9.6/pgtrgm.html](trigram) for more information.
Requires the pg_trgm extension. Configure which extensions you have installed in your `AshPostgres.Repo`
At least one of the `equals`, `greater_than` and `less_than`
# Example
filter(query, [trigram_similarity: [:name, "geoff", [greater_than: 0.4]]])
"""
use Ash.Query.Function, name: :trigram_similarity
def args, do: [:ref, :term, {:options, [:less_than, :greater_than, :equals]}]
def new([_, text | _]) when not is_binary(text) do
{:error, "#{Ash.Query.Function.ordinal(2)} argument must be a string, got #{text}"}
end
def new([%Ref{} = ref, text, opts]) do
with :ok <- required_options_provided(opts),
{:ok, less_than} <- validate_similarity(opts[:less_than]),
{:ok, greater_than} <- validate_similarity(opts[:greater_than]),
{:ok, equals} <- validate_similarity(opts[:equals]) do
new_options = [
less_than: less_than,
greater_than: greater_than,
equals: equals
]
{:ok,
%__MODULE__{
arguments: [
ref,
text,
new_options
]
}}
else
_ ->
{:error,
"Invalid options for `trigram_similarity` in the #{Ash.Query.Function.ordinal(3)} argument"}
end
end
def compare(%__MODULE__{arguments: [ref]}, %Ash.Query.Operator.IsNil{left: ref}) do
:mutually_exclusive
end
def compare(_, _), do: :unknown
defp validate_similarity(nil), do: {:ok, nil}
defp validate_similarity(1), do: {:ok, 1.0}
defp validate_similarity(0), do: {:ok, 0.0}
defp validate_similarity(similarity)
when is_float(similarity) and similarity <= 1.0 and similarity >= 0.0 do
{:ok, similarity}
end
defp validate_similarity(similarity) when is_binary(similarity) do
sanitized =
case similarity do
"." <> decimal_part -> "0." <> decimal_part
other -> other
end
case Float.parse(sanitized) do
{float, ""} -> {:ok, float}
_ -> :error
end
end
defp required_options_provided(opts) do
case {opts[:greater_than], opts[:less_than], opts[:equals]} do
{nil, nil, nil} -> :error
{nil, nil, _equals} -> :ok
{_greater_than, nil, nil} -> :ok
{nil, _less_than, nil} -> :ok
{_greater_than, _less_than, nil} -> :ok
end
end
end