changeset

Validates form parameters without reflection. Built on Dict(String, String).

Types

pub type Changeset {
  Changeset(
    params: Dict(String, String),
    errors: Dict(String, List(String)),
    valid: Bool,
  )
}

Functions

cast

pub fn cast(params: List(#(String, String)), required required_fields: List(String)) -> Changeset

Build a changeset from raw form params. Marks the changeset invalid if any required field is missing or blank after trimming.

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get

pub fn get(cs: Changeset, field: String) -> Option(String)

Return the raw value for a field, or None if not present.

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get_or

pub fn get_or(cs: Changeset, field: String, default: String) -> String

Return the value for a field, or default if absent.

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validate_length

pub fn validate_length(cs: Changeset, field: String, min min_opt: Option(Int), max max_opt: Option(Int)) -> Changeset

Validate the trimmed length of a field. Pass None to skip either bound.

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validate_format

pub fn validate_format(cs: Changeset, field: String, with validator: fn(String) -> Bool, message message: String) -> Changeset

Validate the field value with a predicate. Adds message as the error if the predicate returns False.

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validate_inclusion

pub fn validate_inclusion(cs: Changeset, field: String, in values: List(String)) -> Changeset

Validate that the field value is one of the accepted values.

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errors_for

pub fn errors_for(cs: Changeset, field: String) -> List(String)

Return all error messages for a field, or [] if none.

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valid

pub fn valid(cs: Changeset) -> Bool

True if the changeset has no errors.