Create Split Custom Field Context for Specific Projects and Issue Types in Jira

// Retrieve the list of all fields from the JIRA API and parse the response as a list
def fields = get("/rest/api/3/field").asObject(List).body

// Find and store the ID of a specific custom field named "My Custom Field"
def myField = fields.find { field ->
    field.name == "Select List Field"
}.id

// List of the issue types that the custom field should be available for
// get("/rest/api/3/issuetype").asObject(List).body to get the list of issue types
def issueTypes = ["10005", "10007"] // must be IDs

// Fetch the context configuration for the specific field and parse the response as a map
def context = get("/rest/api/3/field/${myField}/context").asObject(Map).body

// Extract the IDs from all contexts available for the field
def contextIds = context.values*.id

// Initialize an empty list to accumulate all options across different contexts

// Use collect to transform each contextId into a list of options
// Use collectMany to transform each contextId into a list of options and flatten the list
def allOptions = contextIds.collectMany { contextId ->
    // Retrieve options for the current field context from the JIRA API
    def optionsResponse = get("/rest/api/3/field/${myField}/context/${contextId}/option").asObject(Map).body
    // Process the options to remove "id" key from each option and collect into a list
    optionsResponse.values.collect { option ->
        option.entrySet().findAll { it.key != "id" }.collectEntries()
    }
}

// Specify the project names of interest
def projectNames = ["Your project name", "Your second project name"]

// Filter the list of projects to find those that match the specified names
def matchingProjects = Projects.getAllProjects().findAll { it.name in projectNames }

// Extract the project IDs from the matching projects
def projectIds = matchingProjects*.id

// Prepare the data for creating a new context for the field, including description, issue types, name, and project IDs
def contextDescription = "A context used to define the custom field options for bugs."
def contextName = "Your New Context Name"
def contextBody = [
        description : contextDescription,
        issueTypeIds: issueTypes,
        name        : contextName,
        projectIds  : projectIds
]

// Create a new field context by sending a POST request to the JIRA API
def newContext = post("/rest/api/3/field/${myField}/context")
        .header("Content-Type", "application/json")
        .body(contextBody)
        .asObject(Map)
        .body

// Extract the ID of the newly created context
def contextId = newContext.id

// Define the body of the request to set options for the new context
def optionsBody = [
        options: allOptions
]

// Send a POST request to add options to the newly created context
post("/rest/api/3/field/${myField}/context/${contextId}/option")
        .header("Content-Type", "application/json")
        .body(optionsBody)
        .asObject(Map)
        .body