Rails -PG :: InvalidTextRepresentation：错误：格式不正确的数组文字

Question

add_column :ssr_service_markets, :origin, :string, array: true, default: []

and when i want to

SSRService::Market.where(origin: "*", destination: "*").first

I have got

PG::InvalidTextRepresentation: ERROR: malformed array literal: "*" LINE 1: ...service_markets" WHERE "ssr_service_markets"."origin" = '*' DETAIL: Array value must start with "{" or dimension information

How to fix it?

Answer 1

In Postgres, to check if an array contains given element, you can use @> array operator.

Read more: Array Operators

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:origin is an array field in your ssr_service_markets table, which means that it can contain multiple values.

In your example, assuming that destination is an array field as well, you could try to do the searching this way:

Model.where(["origin @> ? AND destination @> ?", '{*}', '{*}')"])

Remember about using curly braces when working with array values .

To write an array value as a literal constant, enclose the element values within curly braces [...]